DS2703UT datasheet(19/20 Pages) DALLAS

Part #	DS2703UT

Description	SHA-1 Battery Pack Authentication IC

PDF	20 Pages

Scroll/Zoom	100%

Manufacturer	DALLAS [Dallas Semiconductor]

Direct Link	https://www.maximintegrated.com/en.html

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19 / 20 page

DS2703 SHA-1 Battery Pack Authentication IC

19 of 20

COMPUTATION AND PROGRAMMING

The Compute Next Secret operation waveform is shown in Figure 11. The user issues a 1-Wire reset followed by a

Skip ROMID command, Match ROMID plus the ROMID, Search or Read Net, followed by the Compute Next Secret

command. The system host must connect the low impedance source to the DQ line within time tD and for a duration

of time tSHA. The DQ line is then pulled to VPP for tPPW milliseconds and then returned to nominal voltage. The fast

rise and fall time requirements for the programming pulse are required to prevent damage during the transition

between normal communication mode and programming mode.

Figure 11. Compute Next Secret Function Command

SKIP ROM

Cmd

Compute

Next Secret

Cmd

1-Wire

Reset

Presence

Pulse

tSHA

Apply Low

Impedance

Pull-up

Apply

Programming

Pulse

tPPR

tPPF

PPW

DS2703UT Datasheet(PDF) 19 Page - Dallas Semiconductor