onewire keepalive

[z0tya]

We have ordered an ECU with 1-wire, to use anti theft function and vems docs said the keepalive rc component built in since 2010-10-29

(HW mod - "1-wire keepalive" function
A recommended HW mod useful for 1-wire theft-protection (standard for assembled controllers ordered with 1-wire=yes option since 2010-10-29) is an RC (1MOhm resistor and 10 uF) on atmega128's knock-ADC pin, so the "1 wire keepalive" function can work (if also enabled in config).
With the "1-wire keepalive" function enabled, and this RC installed, after a reboot the "1-wire authentication" will be remembered for about 10 seconds, so no need to touch on I-button again if power is removed only for a short time (or ECU reboots during driving because of some intermittent alternator spike, misconfigured too high dwell or some other reason).)

, but if i switch keepalive on, the ecu never need i-button touch to start the engine, works always. With keepalive off i-button need on every powerup to start.

Has anybody experience with this?

Thx