MAXIM DS1990A handbook(1)
Contents
1. 3 1O 800pF 1IO 5kQ Vpup 5hs 4 5 IO Viuwmax Viuwax 0 5V 6 7 Van 8 Vpup 9 5 0V 5kQ tsLor lt 120hs 72 30nC 10 tksrb 960hs DS1994 11 12 a IO Vi Vin2. 0 Write 0 1 Write 1 Read Data 1 Wire Vpup Viwvax Viwmax Vinmn 6 s CReup 1 Wire DS1990A 6 DS1990A ROM tRsrL tf 6 MASTER TX RESET PULSE MASTER RX PRESENCE PULSE VPup VIHMIN VILMAX OV te RESISTOR DS1990A DD
3. 48 CRC Search ROM FOh 1 Wire 0 1 0 ROM
4. 16 3kbps a F3 F5 MicroCAN _ UL 913 F3 0 1 A B C D 0 51 I DS1990A F5 40 C 85 C F5 iButton DS1990A F3 40 C 85 C F3 iButton DS9096P DS9101 DS9093RA iButton 1 Wire WMicroCAN Dallas Semiconauctory DS9093A DS9092 iButton MU http Www maxim ic com cn errata 1of8 REV 033005 DS1990A DS1990A IO
5. DS1990A 1 Wire ROM 4of8 DS1990A 4 SIMPLE BUS MASTER DS1990A 1 Wire PORT RX Receive TX Transmit 100o Open Drain MOSFET Port Pin DS2480B BUS MASTER To 1 Wire data Serial Port DS2480B 1 Wire Reset Pulse Presence Pulse DS1990A 1 Wire 1 Wire ROM DS1990A ROM ROM 8 5 gt ROM 33h DS1990A 8 48 8 CRC 0
6. Book of DS19xx iButton Standards 1 Wire 1 Wire DS1990A 1 Wire 4 1 Wire 1 Wire 16 3kbps 2 2kQ 1 Wire 1 Wire 1 Wire 120hs I
7. RX 1 Wire DS2480B Vpup VHhwN DS1990A tb ttou twsp 1 Wire DS1990A 7 1 Wire Viwax DS1990A 1 1 twiLmax Vinwn 0 0 twoLmn Viwax
8. twor Viimax Vinwn DS1990A tREc 7of8 DS1990A 1 tRu Wuvax tl 0 DS1990A 1 DS1990A tL tvsrmin tysrwax tr 8 DS1990A tRu tvsrwax teLor DS1990A thec 7
9. 187 1 Wire 5of8 DS1990A 5 ROM Bus Master TX ROM Function Command 33h Read ROM ommand DS1990A TX Family Code 1 Byte DS1990A TX Serial Number 6 Bytes DS1990A TX CRC Byte Bus Master TX Reset Pulse DS1990A TX Presence Pulse Search ROM ommand 2 DS1990A TX Bit 0 DS1990A TX Bit 0 Master TX Bit 0 DS1990A TX Bit 1 DS1990A TX Bit 1 Master TX Bit 1 DS1990A TX Bit 63 DS1990A TX Bit 63 Match ROM 55h Skip ROM CCh 1 Wire ROM Match ROM Skip ROM DS1990A Match ROM Skip ROM 64 ROM DS1990A ROM DS1990A Match ROM Skip ROM 1 Wire DS1990A DS1994 6of8 DS1990A 1 Wire DS1990A
10. 13 6 IO Vi 14 trsTL 15 1 DS1990A IO ROM 1 Wire ROM 64 ROM 1 DS1990A Parasite Power ROM 64 bit Function Control Lasered ROM 64 ROM DS1990A 64 ROM 8 1 Wire 48 8 56 CRC 2 1 Wire CRC 3 X8 X5 X4 1 Dallas 1 Wire 27 0
11. Write One Time Slot VPup VIHMASTER VIHMIN VILMAX OV te RESISTOR Write Zero Time Slot VPup VIHMASTER VIHMIN VILMAX OV RESISTOR 7 MASTER Read Data Time Slot VPpup J tMsR VIHMASTER VIHMIN Master Sampling VILMAX Window 0V te tsLoT RESISTOR MASTER DS1990A 8of8
12. 1 8 48 CRC 8 CRC 0 3of8 DS1990A 48 8 01H 2 64 ROM LSB MSB 3 1 Wire CRC POLYNOMIAL X8 X5 X4 1 7th A E STAGE 6 X x INPUT DATA 1 Wire 1 Wire DS1990A PC 1 Wire DS2480B 1 Wire DS9097U 1 Wire 1 Wire
13. GND IO WH W 1 Ca 2 5 UL 913 A B C D 0 5V 6 0V 20mA 125 C 55 C 125 C o EA Vpup 2 8V 6 0V TA 40 C 85 C IO 1 Wire Rpup 1 2 0 6 5 kQ Co 3 15 100 800 pF 4 0 25 HA Vi 1 5 6 0 8 V Vin 6 7 2 2 V 4mA Vor 6 0 4 V
14. Von 6 8 Vpup V Qop 9 15 30 nC trEc 1 1 Hs tsior 1 61 hs IO 1 Wire tRsTL 1 10 480 Hs tRsTH 1 11 480 hs tpph 15 60 hs tppL 14 60 240 hs tMsp 1 60 75 hs 10 1 Wire 0 twoL 1 60 120 hs 1 twir 1 12 1 15 8 hs IO 1 Wire tRL 1 13 1 15 8 hs tMsR 1 13 trL 6 15 Hs 2of8 DS1990A 1 2 Rpup Rpup 1 Wire 1 Wire 1 Wire DS2480
15. BDALLAS GY AXK 1II DOLISDA iButton DS1990A iButton 5ms 1 Wire 2 8V 6 0V 40 C 85 C DS1990A 64 iButton iButton 64 DS1990A 1 Wire
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MAXIM DS1990A handbook(1)