NAME

bq4802rtc — Texas Instruments bq4802Y/bq4802LY Real-Time Clock

SYNOPSIS

bq4802rtc* at ebus? # sparc64

DESCRIPTION

The bq4802rtc driver provides access to the Texas Instruments bq4802Y/bq4802LY real-time clock. Access methods to retrieve and set date and time are provided through the TODR interface defined in todr(9).

The chip checks the battery on power-up, and alters an internal if the battery voltage is 2.1 V. The status of the flag is reported through the envstat(8) interface.

The chip also supports stopping the oscillator to conserve battery life if the computer will be stored for an extended period. bq4802rtc driver makes the oscillator control available via sysctl(8). For example:

hw.bq4802rtc0.stop_oscillator = 0

A value of “0” means that the oscillator is running when the computer is powered off, and a value of “1” means that the oscillator is stopped. If the oscillator is stopped, then the driver will output a warning message at attach time, but does not automatically restart the oscillator. envstat(8), sysctl(8,) todr(9)

HISTORY

The bq4802rtc driver first appeared in NetBSD 11.1.

AUTHORS

The bq4802rtc driver was written by Julian Coleman <jcoleman@NetBSD.org>.