MICROCHIP TC7116/A/TC7117/A Manual
Contents
1. F4 7 39 y NC 1 33 NC G4 8 38 CREF NC 2 32063 E 8 TEST 31 D 10 36 common OSC3 4 30 c2 ty TC7116CLW BS Vin NCIS TC7116CKW 383 TC7116ACLW BANC 5 2 6 TC7116ACKW 2 TC7117CLW 33 Vine osc1 7 TC7117CKW 27 POL FA TC7117ACLW Fac HLDR 8 TC7117ACKW 26 AB F2 15 31 Veurr DA 9 25 E3 E t6 30 Vint 10 F3 Ds 17 29 v By 11 23 TSRSEXETEZESPAESESETRS Me 1718 14 24 21 22 Va 29406062606 amp a Note 1 NC No internal connection 2 Pins 9 25 40 and 56 are connected to the die substrate The potential at these pins is approximately V No external connections should be made DS21457C page 2 2006 Microchip Technology Inc TC7116 A TC7117 A Typical Application TC7116 A TC7117 A Display 0 1uF Hold LCD Display TC7116 7116A 34 31 1 Anode LED Display 1MQ 31 CREF CREF HLDR TC7117 7117A 2 19 Segment 7 Vint Drive 20 Analog 0 01uF 22 25 Minus Sign Input 30 Vn POL 0 21 32 ANALOG BP GND COMMON V 35 e Backplane Drive VBUFF Lee Vnggr 25 1 VINT2. Package Type 40 Pin PDIP 40 Pin CERDIP 1 VU HLDR T e 40 OSC1 HLDR 1 40 OSC1 0 2 39 OSC2 39 OSC2 38 OSC3 C1 3 38 OSC3 B 4 37 TEST B 4 37 TEST 1s As 36 VREF fs 5 36 VREF F4 6 35 V 6 35 V Gi 7 34 CREF G 7 34 CREF _ 1 8 mC7116CPL 331 CREF ELS 33 CREF 02 9 TC7116ACPL 32 COMMON D 9 TC7116lJL 37 COMMON Cy HO TC7117CPL 31 Vint fo TC7116AWL Hy Bo 11 TC7117ACPL 301 vy mr ICTL LL 10 s 10s 2 TC7117AIJL iN Ag 12 29 Caz A2 1 9 Caz F2 13 28 VBUFF F203 28 Veurr 0 15 26 v __ 15 26 v 16 25 G 16 25 1005 24 is 1005 2 5 17 24103 17 24 0 4 5 ha 18 23 18 pesi 1000 s gt AB 19 22 G3 1000 gt AB 19 G POL 20 21 BP GND POL 20 21 BP GND Minus Sign TC7116 7117 Minus Sign 1 7116 7117 TC7116A TC7117A TC7116A TC7117A 44 Pin PLCC 44 Pin zZ 4 28 c i LL gt 1 0 o0 r ENS NNB lt 0 0NA gt gt gt 0 gt gt gt gt gt 5 4 3 2 1 44 3 42 0 89 oo NI TE F EN To T N To D e 93
3. TC7117 TC7117A PORE MUT 2568 ne Typical Segment Output e V uM 7 Segment 7 Segment 7 Segment j _0 5 Decode Decode Decode Segment e 1 EmA Latch 4 Digital Ground Internal Digital Ground Thousands Hundreds lt Tens Units lt 1 To Switch Drivers 4 From Comparator Output V 35 V y 7 Clock TEST 4 Control Logic 5000 21 Digital GND Aa AAA 7 OSC1 OSC2 OSC34 HLDR 1 FIGURE 3 6 TC7117 TC7117A Digital Section 2006 Microchip Technology Inc DS21457C page 11 TC7116 A TC7117 A 4 0 COMPONENT VALUE SELECTION 4 1 Auto Zero Capacitor The size of the auto zero capacitor has some influence on system noise For 200mV full scale where noise is very important a 0 47uF capacitor is recommended On the 2V scale a 0 047uF capacitor increases the speed of recovery from overload and is adequate for noise on this scale 4 2 Reference Capacitor A 0 1uF capacitor is acceptable in most applications However where a large Common mode voltage exists i e the Vin pin is not at analog common and 200mV scale is used a larger value is required to pre vent rollover error Generally 1uF will hold the rollover error to 0 5 count in this instance 4 3 Integrating Capacitor Th
4. H 1 370 360 1 um 32 31 TC7117 3 TC7117A 90 28 250 1 24 3H To Display LH FIGURE 6 4 Single Ended Inputs TC7117 TC7117A Internal Reference 200 mV Full Scale RPS Vy Tied to GND for 2006 Microchip Technology Inc DS21457C page 15 TC7116 A TC7117 A V V 40 To Logic ii To Logic TC7116 GND TC7116A 26 oV OR Wm d Gu oC 4 20 iles CD4023 ye or 74C10 CD4077 O R Over Range U R Under Range FIGURE 6 5 Circuit for Developing Under Range and Over Range Signals From TC7116 TC7117A Outputs 39 EE AAA 10089 Set Vref 100mV 1 37 100pF 28 y 10kQ 10kQ La 0 1pF amp 1KO gt 33 ihi 12V 32 5 gt TC7117 qoo 1MQ 1 TC7117A u 0 22uF V n 10 O 25 23 Display FIGURE 6 6 TC7117 TC7117A With A 1 2 External Bandgap Reference Tied to Common DS21457C page 16
5. 2006 Microchip Technology Inc TC7116 A TC7117 A Set VREF 1V 40 100kQ 37 100pF 6 24kQ 34 AW OV our 25 33 H 1MQ 32 O O TC7116 3 TC7116A 30 Eco 7117 H 470 TC7417A SE 24 D 0 01 0 22uF To Display FIGURE 6 7 Recommended Component Values for 2V Full Scale TC7116 TC7116A and TC7117 TC7117A 39 AAA 10009 Set Vrer 100mV pI 37 100pF 2 49 10kQ 10kQ 34 1 1kQ 5 0 1 32 o TC7117 1 eo 1MQ TC7117A 29 2474F 0 221 24 Display FIGURE 6 8 7117 7117 Operated From Single 5V Supply An External Reference Must be Used in This Application 2006 Microchip Technology Inc DS21457C page 17 TC7116 A TC7117 A 7 0 PACKAGING INFORMATION 7 1 Package Marking Information Package marking data not available at this time 7 2 Taping Form Component Taping Orientation for 44 Pin PLCC Devices User Direction of Feed W Standard Reel Component Orientation for 713 Suffix Device Carrier Tape Number of Components Per Reel and Reel Size Pac
6. DS21457C page 19 TC7116 A TC7117 A 7 3 Package Dimensions Continued Standard Reel Component Orientation for 713 Suffix Device Carrier Tape Number of Components Per Reel and Reel Size 398 10 10 390 9 90 557 14 15 537 13 65 Package Carrier Width W Pitch P Part Per Full Reel Reel Size 44 Pin PLCC 32 mm 24 mm 500 13 in Note Drawing does not represent total number of pins Dimensions inches mm 44 Pin PQFP a T 009 0 1 Pin 1 1 005 0 p oat 1 03 026 0 65 018 0 45 _ E 012 0 30 F Ex 398 10 10 En 390 90 557 14 15 031 0 80 Typ T 537 pucr 65 010 0 25 083 2 10 075 1 90 096 2 45 Max Dimensions inches mm DS21457C page 20 2006 Microchip Technology Inc TC7116 A TC7117 A PRODUCT IDENTIFICATION SYSTEM To order or obtain information e g on pricing or delivery refer to the factory or the listed sales office PART CODE TC711X 6 LCD 7 LED A or blank reversed pins or blank CPL pkg only A parts have an improved reference Package Code see Device Selection Table 2006 Microchip Technology Inc DS21457C page 21 TC7116 A TC7117 A NOTES DS21457C page 22 2006 Microchip Technology Inc Note the following details of the code protection feature on Microchip devices Microchi
7. Delhi Tel 91 11 5160 8631 Fax 91 11 5160 8632 India Pune Tel 91 20 2566 1512 Fax 91 20 2566 1513 Japan Yokohama Tel 81 45 471 6166 Fax 81 45 471 6122 Korea Gumi Tel 82 54 473 4301 Fax 82 54 473 4302 Korea Seoul Tel 82 2 554 7200 Fax 82 2 558 5932 or 82 2 558 5934 Malaysia Penang Tel 60 4 646 8870 Fax 60 4 646 5086 Philippines Manila Tel 63 2 634 9065 Fax 63 2 634 9069 Singapore Tel 65 6334 8870 Fax 65 6334 8850 Taiwan Hsin Chu Tel 886 3 572 9526 Fax 886 3 572 6459 Taiwan Kaohsiung Tel 886 7 536 4818 Fax 886 7 536 4803 Taiwan Taipei Tel 886 2 2500 6610 Fax 886 2 2508 0102 Thailand Bangkok Tel 66 2 694 1351 Fax 66 2 694 1350 EUROPE Austria Wels Tel 43 7242 2244 399 Fax 43 7242 2244 393 Denmark Copenhagen Tel 45 4450 2828 Fax 45 4485 2829 France Paris Tel 33 1 69 53 63 20 Fax 33 1 69 30 90 79 Germany Munich Tel 49 89 627 144 0 Fax 49 89 627 144 44 Italy Milan Tel 39 0331 742611 Fax 39 0331 466781 Netherlands Drunen Tel 31 416 690399 Fax 31 416 690340 Spain Madrid Tel 34 91 708 08 90 Fax 34 91 708 08 91 UK Wokingham Tel 44 118 921 5869 Fax 44 118 921 5820 02 16 06 DS21457C page 24 2006 Microchip Technology Inc
8. The oscillator frequency is 4 before it clocks the decade counters It is then further divided to form the three convert cycle phases Signal Integrate 1000 counts Reference De integrate 0 to 2000 counts and Auto Zero 1000 to 3000 counts For signals less than full scale auto zero gets the unused portion of ref erence de integrate This makes a complete measure cycle of 4000 16 000 clock pulses independent of input voltage For 3 readings per second an oscillator frequency of 48 2 would be used To achieve maximum rejection of 60Hz pickup the sig nal integrate cycle should be a multiple of 60Hz Oscil lator frequencies of 240kHz 120kHz 80kHz 60kHz 48kHz 40kHz etc should be selected For 50Hz rejec tion oscillator frequencies of 200kHz 100kHz 66 2 3kHz 50kHz 40kHz etc would be suitable Note that 40kHz 2 5 readings per second will reject both 50Hz and 60Hz 3 2 2 HOLD READING INPUT When HLDR is at a logic HIGH the latch will not be updated Analog to Digital conversions will continue but will not be updated until HLDR is returned to LOW To continuously update the display connect to TEST TC7116 TC7116A or GROUND 7117 7117 or disconnect This input is CMOS compatible with 70kQ typical resistance to TEST TC7116 TC7116A or GROUND TC7117 TC7117A
9. a negative supply is not avail able it can be generated with a TC7660 DC to DC con verter and two capacitors Figure 5 1 shows this application In selected applications a negative supply is not required The conditions for using a single 5V supply are 1 The input signal be referenced to the center of the Common mode range of the converter 2 signal is less than 1 5V 3 external reference is used A 5V F 35 I I gt VREF LED Drive ci 32 2 TC7117 1 TC7117A 31 4 2 Vint VIN 8 0 6 2 v GND iOuF TC7660 4 5 5v 26 3 10uF FIGURE 5 1 Negative Power Supply Generation with TC7660 2006 Microchip Technology Inc DS21457C page 13 TC7116 A TC7117 A 6 0 TYPICAL APPLICATIONS The TC7117 TC7117A sink the LED display current causing heat to build up in the IC package If the inter nal voltage reference is used the changing chip tem perature can cause the display to change reading By reducing the LED common anode voltage the TC7117 TC7117A package power dissipation is reduced Figure 6 1 is a curve tracer display showing the rela tionship between output current and output voltage for typical TC7117CPL TC7117ACPL devices Since a typical LED has 1 8V across it at 8mA and its common anode is connected to 5V
10. 1 6 ANALOG COMMON This pin is included primarily to set the Common mode voltage for battery operation TC7116 TC7116A or for any system where the input signals are floating with respect to the power supply The analog common pin sets a voltage approximately 2 8V more negative than the positive supply This is selected to give a minimum end of life battery voltage of about 6V However analog common has some attributes of a reference voltage When the total supply voltage is large enough to cause the Zener to regulate gt 7V the analog common volt age will have a low voltage coefficient 0 001 low output impedance 15Q and a temperature coeffi cient of less than 20ppm C typically and 50 ppm max imum The 7116 7117 temperature coefficients are typically 80ppm C An external reference may be used if necessary as shown in Figure 3 2 V V TC7116 TC7116A TC7117 TC7117A T VREF m 1 2V REF COMMON FIGURE 3 2 Using an External Reference Analog common is also used as Vin return during auto zero and de integrate If Vin is different from ana log common a Common mode voltage exists in the system and is taken care of by the excellent CMRR of the converter However in some applications Viw will be set at a fixed known voltage power supply common for instance In this application analog common should be tied to the same point thus removing the
11. 5 6 V V to V 9V Segment Drive Voltage Note 4 Vgp TC7116A TC7116A ONLY Peak to 4 5 6 V V to V 9V Peak Note 4 Backplane Drive Voltage TC7117 TC7117A ONLY 5 8 V 5 0V Segment Sinking Current Segment Voltage 3V Except Pin 19 TC7117 TC7117A ONLY 10 16 mA V 5 0V Segment Sinking Current Pin 19 Only Segment Voltage 3V Note 1 Input voltages may exceed the supply voltages provided the input current is limited to 100yA 2 Dissipation rating assumes device is mounted with all leads soldered to printed circuit board 3 Refer to Differential Input discussion 4 Backplane drive is in phase with segment drive for OFF segment 180 out of phase for ON segment Frequency is 20 times conversion rate Average DC component is less than 50mV 5 The TC7116 TC7116A logic inputs have an internal pull down resistor connected from HLDR Pin 1 to TEST Pin 37 The TC7117 TC7117A logic inputs have an internal pull down resistor connected from HLDR Pin 1 to GND Pin 21 2006 Microchip Technology Inc DS21457C page 5 TC7116 A TC7117 A 2 0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 2 1 TABLE 2 1 PIN FUNCTION TABLE Pin Number 40 Pin PDIP HT REED Symbol Description 40 Pin CERDIP 1 8 HLDR Hold pin Logic 1 holds present display reading 2 9 D Activates the D section of the unit
12. 6A logic inputs have an internal pull down resistor connected from HLDR Pin 1 to TEST Pin 37 The TC7117 TC7117A logic inputs have an internal pull down resistor connected from HLDR Pin 1 to GND Pin 21 DS21457C page 4 2006 Microchip Technology Inc TC7116 A TC7117 A TABLE 1 1 TC7116 A AND TC7117 A ELECTRICAL SPECIFICATIONS CONTINUED Electrical Characteristics Unless otherwise noted specifications apply to both the TC7116 A and TC7117 A at Ta 25 C fcLock 48kHz Parts are tested in the circuit of the Typical Operating Circuit Symbol Parameter Min Typ Max Unit Test Conditions Scale Factor Temperature Coefficient 1 5 Vin 199mV Device 0 to 70 C Ext Ref Oppm C 20 ppm C I Device 25 C to 85 C Input Resistance Pin 1 30 70 Note 5 Vit Pin 1 Test 1 5 V TC7116 A Only Vit Pin 1 GND 1 5 V TC7117 A Only Vin Pin 1 V 1 5 V Both Ipp Supply Current Does not Include LED 0 8 1 8 mA Vin OV Current for TC7117 A Vc Analog Common Voltage 2 4 3 05 3 35 V 25kQ Between Common with Respect to Positive Supply and Positive Supply Vcrc Temperature Coefficient of Analog Device 0 C to 70 C Common with Respect to Positive 20 50 7116 7117 Supply 80 ppm C TC7116 TC7117 Vsp TC7116 TC7117A ONLY Peak to Peak 4
13. Common mode voltage from the converter The same holds true for the reference voltage if it can be conve niently referenced to analog common it should be This removes the Common mode voltage from the reference system Within the IC analog common is tied to an N channel FET that can sink 30mA or more of current to hold the voltage 3V below the positive supply when a load is trying to pull the analog common line positive How ever there is only 10uA of source current so analog common may easily be tied to a more negative voltage thus overriding the internal reference 3 1 7 TEST The TEST pin serves two functions On the TC7117 TC7117A it is coupled to the internally generated digi tal supply through 5000 resistor Thus it can be used as a negative supply for externally generated segment drivers such as decimal points or any other presenta tion the user may want to include on the LCD Figure 3 3 and Figure 3 4 show such an application No more than a 1mA load should be applied The second function is a lamp test When TEST is pulled HIGH to V all segments will be turned ON and the display should read 1888 The TEST pin will sink about 10mA under these conditions 2 pue 7116 404 TC7116A 5o L To LCD 21 i Decimal TEST eD T 37 o To LCD Backplane FIGURE 3 3 Simple Inverter for Fixed Decimal Point 2006 Microchip Technology In
14. EQUATION 4 1 For a 48kHz clock 3 readings per second C 100pF 4 6 Reference Voltage To generate full scale output 2000 counts the analog input requirement is Vin 2VREF Thus for the 200mV and 2V scale VREF should equal 100mV and 1V respectively In many applications where the ADC is connected to a transducer a scale factor exists between the input voltage and the digital reading For instance in a measuring system the designer might like to have a full scale reading when the voltage from the transducer is 700mV Instead of dividing the input down to 200mV the designer should use the input voltage directly and select VREr 350mV Suitable values for integrating resistor and capacitor would be 120kW and 0 22uF This makes the system slightly quieter and also avoids a divider network on the input The TC7117 TC7117A with 5V supplies can accept input signals up to 4V Another advantage of this system is when digital reading of zero is desired for 0 Tempera ture and weighing systems with a variable tare are examples This offset reading can be conveniently gen erated by connecting the voltage transducer between Vint and analog common and the variable or fixed offset voltage between analog common and Vi DS21457C page 12 2006 Microchip Technology Inc TC7116 A TC7117 A 5 0 7117 7117 POWER SUPPLIES The 7117 7117 are designed to operate from 5V supplies However if
15. MICROCHIP TC7116 A TC7117 A 3 1 2 Digit Analog to Digital Converters with Hold Features Low Temperature Drift Internal Reference TC7116 TC7117 80 ppm C Typ TC7116A TC7117A 20 ppm C Typ Display Hold Function Directly Drives LCD or LED Display Zero Reading with Zero Input Low Noise for Stable Display 2V or 200mV Full Scale Range FSR Auto Zero Cycle Eliminates Need for Zero Adjustment Potentiometer True Polarity Indication for Precision Null Applications Convenient 9V Battery Operation TC7116 TC7116A High Impedance CMOS Differential Inputs 10720 Low Power Operation 10mW Applications Thermometry Bridge Readouts Strain Gauges Load Cells Null Detectors Digital Meters Voltage Current Ohms Power pH Digital Scales Process Monitors Portable Instrumentation Device Selection Table Package Code Package Temperature Range CPL 40 Pin PDIP 0 C to 70 C IJL 40 Pin CERDIP 25 C to 85 C CKW 44 Pin 0 C to 70 C CLW 44 Pin PLCC 0 C to 70 C General Description The TC7116A TC7117A are 3 1 2 digit CMOS Analog to Digital Converters ADCs containing all the active components necessary to construct a 0 05 resolution measurement system Seven segment decoders polarity and digit drivers voltage reference and clock circuit are integrated on chip The TC7116A drives Liquid Crystal Displays LCDs and includes a back plane driver The
16. TC7117A drives common anode Light Emitting Diode LED displays directly with an 8mA drive current per segment These devices incorporate a display hold HLDR function The displayed reading remains indefinitely as long as HLDR is held high Conversions continue but output data display latches are not updated The refer ence low input VREF is not available as it is with the TC7106 7107 VREF is tied internally to analog common the TC7116A 7117A devices The TC7116A 7117A reduces linearity error to less than 1 count Rollover error the difference in readings for equal magnitude but opposite polarity input signals is below 1 count High impedance differential inputs offer 1pA leakage current and a 10720 input imped ance 15uVp_p noise performance enables a rock solid reading The auto zero cycle ensures a zero display reading with a OV input The 7116 and TC7117A feature a precision low drift internal reference and are functionally identical to the TC7116 TC7117 A low drift external reference is not normally required with the TC7116A TC7117A 2006 Microchip Technology Inc DS21457C page 1 TC7116 A TC7117 A
17. Voltage 36 44 VRer The analog input required to generate a full scale output 1999 counts Place 100mV between Pins 32 and 36 for 199 9mV full scale Place 1V between Pins 35 and 36 for 2V full scale See Section 4 6 Reference Voltage Refer ence Voltage 37 3 TEST Lamp test When pulled HIGH to V all segments will be turned on and the dis play should read 1888 It may also be used as a negative supply for externally generated decimal points See Section 3 1 7 Test TEST for additional infor mation 38 4 OSC3 See Pin 40 39 6 OSC2 See Pin 40 40 7 OSC1 Pins 40 39 38 make up the oscillator section For a 48kHz clock 3 readings per section connect Pin 40 to the junction of a 100kQ resistor and a 100pF tor 100kQ resistor is tied to Pin 39 and the 100pF capacitor is tied to Pin 38 2006 Microchip Technology Inc DS21457C page 7 TC7116 A TC7117 A 3 0 DETAILED DESCRIPTION All Pin Designations Refer to 40 Pin PDIP 3 1 Analog Section Figure 3 1 shows the block diagram of the analog sec tion for the TC7116 TC7116A and TC7117 TC7117A Each measurement cycle is divided into three phases 1 Auto Zero AZ 2 Signal Integrate INT and 3 Reference Integrate REF or De integrate DE 3 1 1 AUTO ZERO PHASE High and low inputs are disconnected from the pins and internally shorted to analog common The reference capacitor is charged to the reference volt
18. age A feed back loop is closed around the system to charge the auto zero capacitor CAz to compensate for offset volt ages in the buffer amplifier integrator and comparator Since the comparator is included in the loop AZ accuracy is limited only by system noise The offset referred to the input is less than 10uV 3 1 2 SIGNAL INTEGRATE PHASE The auto zero loop is opened the internal short is removed and the internal high and low inputs are connected to the external pins The converter then inte grates the differential voltages between Viy and Viy for a fixed time This differential voltage can be within a wide Common mode range 1V of either supply How ever if the input signal has no return with respect to the converter power supply Viy can be tied to analog common to establish the correct Common mode voltage At the end of this phase the polarity of the integrated signal is determined e Cpz Ec Y Auto Zero YVINT o 29 27 Integrator 1 7 To Vint E Digital Section TC7116 ide TC7116A ien TC7117 VIN o TC7117A FIGURE 3 1 3 1 3 REFERENCE INTEGRATE PHASE The final phase is reference integrate or de integrate Input low is internally connected to analog common and input high is connected across the previously charged reference capacitor Circuit
19. c DS21457C page 9 TC7116 A TC7117 A EE i BP 1 sup TC7116 D gt Tetcb TC71 1 6A 1 1 Decimal Select Er TEST 1 4090 GND FIGURE 3 4 Exclusive OR Gate for Decimal Point Drive 3 2 Figure 3 5 and Figure show the digital section for TC7116 TC7116A and TC7117 TC7117A respectively For the TC7116 TC7116A Figure 3 5 an internal dig ital ground is generated from a 6V Zener diode and a Digital Section large P channel source follower This supply is made stiff to absorb the relative large capacitive currents when the backplane BP voltage is switched The BP frequency is the clock frequency 4800 For 3 readings per second this is a 60 2 square wave with a nominal amplitude of 5V The segments are driven at the same frequency and amplitude and are in phase with BP when OFF but out of phase when ON In all cases negligible DC voltage exists across the segments Figure is the digital section of the TC7117 TC7117A It is identical to the TC7116 TC7116A except that the regulated supply and BP drive have been eliminated and the segment drive is typically 8mA The 1000 s out put Pin 19 sinks current from two LED segments and has a 16mA drive capability The TC7117 TC7117A are designed to drive common anode LED displays In both devices the polarity indication is ON for analog inputs If Viy and Vin are reversed this indication can b
20. e integrating capacitor should be selected to give the maximum voltage swing that ensures tolerance buildup will not saturate the integrator swing approximately 0 3V from either supply In the TC7116 TC7116A or the TC7117 TC7117A when the analog common is used as a reference a nominal 2V full scale integrator swing is acceptable For the TC7117 TC7117A with 5V supplies and analog common tied to supply ground a 3 5V to 4V swing is nominal For 3 read ings per second 48kHz clock nominal values for are 0 22u1F and 0 10uF respectively If different oscil lator frequencies are used these values should be changed in inverse proportion to maintain the output swing The integrating capacitor must have low dielec tric absorption to prevent rollover errors Polypropylene capacitors are recommended for this application 4 4 Integrating Resistor Both the buffer amplifier and the integrator have a class A output stage with 100uA of quiescent current They can supply 20uA of drive current with negligible non linearity The integrating resistor should be large enough to remain in this very linear region over the input voltage range but small enough that undue leak age requirements are not placed on the PC board For 2V full scale 470kQ is near optimum and similarly 47kQ for 200mV full scale 4 5 Oscillator Components For all frequency ranges a 100kQ resistor is recom mended the capacitor is selected from the equation
21. e reversed also if desired TC7116 TC7116A Backplane 21 i LCD Phase Driver Typical Segment Output i V _ 7 Segment 7 Segment 7 Segment 200 0 5mA Decode Decode Decode 1 Segment Output 2mA Latch e Internal Digital Ground i Thousands 4 Hundreds 4 Tens lt J Units 4 9 Switch Drivers From Comparator Output 35 e OV Clock Y 62 4 e Logic Control o TEST n VrH 1V 5000 40 39 38 Internal Digital Ground 1 e PO 26 by RE el E EE eee Ec ve So ete dt 4 P OSCiQ 05621 05633 HLDR H FIGURE 3 5 TC7116 TC7116A Digital Section DS21457C page 10 2006 Microchip Technology Inc TC7116 A TC7117 A 3 2 1 SYSTEM TIMING The clocking method used for the TC7116 TC7116A TC7117 TC7117A is shown in Figure Three clocking methods may be used 1 Anexternal oscillator connected to Pin 40 2 crystal between Pins 39 and 40 3 AnRC network using all three pins
22. fications apply to both the TC7116 A and TC7117 A at Ta 25 C fcLock 48kHz Parts are tested in the circuit of the Typical Operating Circuit Symbol Parameter Min Typ Max Unit Test Conditions ZiR Zero Input Reading 0 Digital Vin OV Reading Full Scale 200mV Ratiometric Reading 999 999 1000 1000 Digital Vin VREF Reading VREF 100mV R O Rollover Error Difference in Reading 1 0 2 1 Counts Vn Vint 200mV for Equal Positive and Negative or 2V Readings Near Full Scale Linearity Maximum Deviation from 1 0 2 1 Counts Full Scale 200mV or 2V Best Straight Line Fit CMRR Common Mode Rejection Ratio 50 uV V Vom 1V Vin OV Note 3 Full Scale 200mV en Noise Peak to Peak 95 of Time 15 uV Vin OV Full Scale 200mV IL Leakage Current at Input 1 10 pA Vin OV Zero Reading Drift 0 2 1 uVeC Vin OV Device 0 C to 70 C 1 0 2 uV C Device 25 C to 85 C Note 1 Input voltages may exceed the supply voltages provided the input current is limited to 100yA Dissipation rating assumes device is mounted with all leads soldered to printed circuit board 2 3 Refer to Differential Input discussion 4 Backplane drive is in phase with segment drive for OFF segment 180 out of phase for ON segment Frequency is 20 times conversion rate Average DC component is less than 50mV 5 The TC7116 TC711
23. ion capacitor See Section 4 3 Integrating Capacitor Integrating Capacitor for more details 28 36 Veurr Integration resistor connection Use a 47kQ resistor for a 200mV full scale range and a 470kQ resistor for 2V full scale range 29 37 Caz The size of the auto zero capacitor influences system noise Use a 0 47uF capacitor for 200mV full scale and 0 047uF capacitor for 2V full scale See Section 4 1 Auto Zero Capacitor Auto Zero Capacitor for more details 30 38 Vine The analog LOW input is connected to this pin 31 39 Vint The analog HIGH input signal is connected to this pin 32 40 COMMON This pin is primarily used to set the Analog Common mode voltage for battery operation or in systems where the input signal is referenced to the power sup ply It also acts as a reference voltage source See Section 3 1 6 Analog Com mon Analog Common for more details 33 41 CREF See Pin 34 DS21457C page 6 2006 Microchip Technology Inc TC7116 A TC7117 A TABLE 2 1 PIN FUNCTION TABLE CONTINUED Pin Number Pin Number 40 Pin PDIP 44 Pin PQFP Symbol Description 40 Pin CERDIP 34 42 capacitor is used in most applications If a large Common mode voltage exists for example the Viy is not at analog common and a 200mV scale is used a 1uF capacitor is recommended and will hold the rollover error to 0 5 count 35 43 V Positive Power Supply
24. kage Carrier Width W Pitch P Part Per Full Reel Reel Size 44 Pin PLCC 32 mm 24 mm 500 13 in Note Drawing does not represent total number of pins Component Taping Orientation for 44 Pin PQFP Devices User Direction of Feed W 1 Standard Reel Component Orientation for 713 Suffix Device Carrier Tape Number of Components Per Reel and Reel Size Package Carrier Width W Pitch P Part Per Full Reel Reel Size 44 Pin PQFP 24 mm 16 mm 500 13 in Note Drawing does not represent total number of pins DS21457C page 18 2006 Microchip Technology Inc TC7116 A TC7117 A 7 3 Package Dimensions 40 Pin PDIP Wide Pin 1 555 14 10 530 13 46 2 065 52 45 610 15 49 2 027 51 49 7 590 14 99 200 5 08 140 3 56 57 1 040 1 02 d 020 0 51 015 0 38 26 Fe smn 700 17 78 610 15 50 110 2 79 070 1 78 022 0 56 090 2 29 045 1 14 015 0 38 Dimensions inches mm 40 Pin CERDIP Wide Pin 1 540 13 72 510 12 95 J 2 49 Max 0 76 2 070 52 58 620 15 75 2 030 51 56 590 15 00 060 1 52 210 5 33 020 0 51 170 4 32 A F 015 0 38 200 5 08 150 3 81 008 0 20 23 Min 125 3 18 Min _ ells 700 17 78 110 2 79 065 1 65 020 0 51 090 2 29 045 1 14 016 0 41 Dimensions inches mm 2006 Microchip Technology Inc
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27. ming ICSP ICEPIC Linear Active Thermistor Mindi MiWi MPASM MPLIB MPLINK PICkit PICDEM PICDEM net PICLAB PICtail PowerCal Powerlnfo PowerMate PowerTool REAL ICE rfLAB rfPICDEM Select Mode Smart Serial SmartTel Total Endurance UNI O WiperLock and ZENA are trademarks of Microchip Technology Incorporated in the U S A and other countries SQTP is a service mark of Microchip Technology Incorporated in the U S A All other trademarks mentioned herein are property of their respective companies 2006 Microchip Technology Incorporated Printed in the U S A All Rights Reserved gt Printed on recycled paper Microchip received ISO TS 16949 2002 certification for its worldwide headquarters design and wafer fabrication facilities in Chandler and Tempe Arizona Gresham Oregon and Mountain View California The Company s quality system processes and procedures are for its 8 bit MCUs KEELOQ code hopping devices Serial EEPROMs microperipherals nonvolatile memory and analog products In addition Microchip s quality system for the design and manufacture of development systems is ISO 9001 2000 certified 2006 Microchip Technology Inc DS21457C page 23 MICROCHIP WORLDWIDE SALES AND SERVICE AMERICAS Corporate Office 2355 West Chandler Blvd Chandler AZ 85224 6199 Tel 480 792 7200 Fax 480 792 7277 Technical Support http support microchip com Web Address www
28. nts a 111 display to worst case a 1888 display the resistor circuit will change about 230mW while a circuit without the resistor will change about 470mW Therefore the resistor will reduce the effect of display dissipation on reference voltage drift by about 50 The change in LED brightness caused by the resistor is almost unnoticeable as more segments turn off If display brightness remaining steady is very important to the designer a diode may be used instead of the resistor 5V In 5V Oe o 150kQ 0 47 UM HE 02 7 TP5 nM y 100 9 47 Pipay 40 30 21 7117 7117 1 10 20 E oes Display 1 5W 1 40 Y LANA 7 1N4001 4 1999 FIGURE 6 2 Diode or Resistor Limits Package Power Dissipation DS21457C page 14 2006 Microchip Technology Inc TC7116 A TC7117 A TC7116 TC7116A _ Set VRer 100 To Display 21 To Backplane FIGURE 6 3 Second RPS 7116 7117 Using the Internal Reference 200 mV Full Scale 3 Readings Per n Set Vper 100mV bs 100kQ
29. p products meet the specification contained in their particular Microchip Data Sheet Microchip believes that its family of products is one of the most secure families of its kind on the market today when used in the intended manner and under normal conditions There are dishonest and possibly illegal methods used to breach the code protection feature All of these methods to our knowledge require using the Microchip products in a manner outside the operating specifications contained in Microchip s Data Sheets Most likely the person doing so is engaged in theft of intellectual property Microchip is willing to work with the customer who is concerned about the integrity of their code Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code Code protection does not mean that we are guaranteeing the product as unbreakable Code protection is constantly evolving We at Microchip are committed to continuously improving the code protection features of our products Attempts to break Microchip s code protection feature may be a violation of the Digital Millennium Copyright Act If such acts allow unauthorized access to your software or other copyrighted work you may have a right to sue for relief under that Act Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates It is your responsibi
30. ry within the chip ensures that the capacitor will be connected with the correct polarity to cause the integrator output to return to zero The time required for the output to return to zero is proportional to the input signal The digital reading displayed is EQUATION 3 1 1000 Analog Section of TC7116 1C7116A and TC7117 1C7117A 3 1 4 REFERENCE The positive reference voltage is referred to analog common DS21457C page 8 2006 Microchip Technology Inc TC7116 A TC7117 A 3 1 5 DIFFERENTIAL INPUT This input can accept differential voltages anywhere within the Common mode range of the input amplifier or specifically from 1V below the positive supply to 1V above the negative supply In this range the system has a CMRR of 86aB typical However since the inte grator also swings with the Common mode voltage care must be exercised to ensure that the integrator output does not saturate A worst case condition would be a large positive Common mode voltage with a near full scale negative differential input voltage The nega tive input signal drives the integrator positive when most of its swing has been used up by the positive Common mode voltage For these critical applications the integrator swing can be reduced to less than the recommended 2V full scale swing with little loss of accuracy The integrator output can swing within 0 3V of either supply without loss of linearity 3
31. s display 3 10 Activates the section of the units display 4 11 B Activates the B section of the units display 5 12 A Activates the section of the units display 6 13 F Activates the F section of the units display 7 14 Q4 Activates the G section of the units display 8 15 Activates the section of the units display 9 16 Do Activates the D section of the tens display 10 17 Co Activates the C section of the tens display 11 18 Bo Activates the B section of the tens display 12 19 Ao Activates the A section of the tens display 13 20 Fo Activates the F section of the tens display 14 21 Es Activates the section of the tens display 15 22 Activates the D section of the hundreds display 16 23 Activates the section of the hundreds display 17 24 Activates the F section of the hundreds display 18 25 E3 Activates the section of the hundreds display 19 26 AB4 Activates both halves of the 1 in the thousands display 20 27 POL Activates the negative polarity display 21 28 BP LCD backplane drive output TC7116 TC7116A Digital ground GND TC7117 TC7117A 22 29 Activates the G section of the hundreds display 23 30 Activates the A section of the hundreds display 24 31 C3 Activates the C section of the hundreds display 25 32 Go Activates the G section of the tens display 26 34 V Negative power supply voltage 27 35 Integrator output Connection point for integrat
32. the TC7117 TC7117A out put is at 3 2V Point A Figure 6 1 Maximum power dissipation is 8 1mA x 3 2V x 24 segments 622mW However notice that once the TC7117 TC7117A s out put voltage is above 2V the LED current is essentially constant as output voltage increases Reducing the output voltage by 0 7V Point B Figure 6 1 results in 7 7mA of LED current only a 5 reduction Maximum power dissipation is now only 7 7mA x 2 5V x 24 462mW a reduction of 26 An output voltage reduc tion of 1V Point C reduces LED current by 1096 7 3mA but power dissipation by 38 7 3mA 2 2V x 24 385mW Output Current mA Output Voltage V FIGURE 6 1 vs Output Voltage TC7117 TC7117A Output Reduced power dissipation is very easy to obtain Figure 6 2 shows two ways either 5 10 1 4W resis tor or a 1A diode placed in series with the display but not in series with the TC7117 TC7117A The resistor reduces the TC7117 TC7117A s output voltage when all 24 segments are ON to Point C of Figure 6 1 When segments turn off the output voltage will increase The diode however will result in a relatively steady output voltage around Point B In addition to limiting maximum power dissipation the resistor reduces change in power dissipation as the display changes The effect is caused by the fact that as fewer segments are ON each ON output drops more voltage and current For the best case of six segme
33. v 26 OSC2 OSC3 OSC1 To Analog 39 Cosc 40 Common Pin 32 3 Conversions Per Second 100kQ 2006 Microchip Technology Inc DS21457C page 3 TC7116 A TC7117 A 10 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings Supply Voltage Veto GND uini iere Analog Input Voltage Input Note 1 V to V Reference Input Voltage Either Input V to V Clock Input 7116 7116 TEST to V TC7117 TC7117A GND to V Package Power Dissipation Ta lt 70 C Note 2 40 Pin CDIP esee 2 29W 40 Pin PDIP tenere 1 28W 44 Pin PLG ss 1 28W 44 Pin PQFP een 1 00W Operating Temperature C Commercial Device O C to 70 C Commercial Device 0 C to 70 C Storage Temperature 65 C to 150 C TABLE 1 1 above those listed under Absolute Maximum Ratings may cause permanent damage to the device These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of the specifications is not implied Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability TC7116 A AND TC7117 A ELECTRICAL SPECIFICATIONS Electrical Characteristics Unless otherwise noted speci
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MICROCHIP TC7116/A/TC7117/A Manual