ZHCS926C May 2012 – May 2021 BQ34Z100
PRODUCTION DATA
FULL SLEEP mode is entered automatically when the device is in SLEEP mode and the timer counts down to 0 (Full Sleep Wait Time > 0). FULL SLEEP mode is disabled when Full Sleep Wait Time is set to 0.
During FULL SLEEP mode, the device periodically takes data measurements and updates its data set. However, a majority of its time is spent in an idle condition.
The gauge exits the FULL SLEEP mode when there is any communication activity. Therefore, the execution of SET_FULLSLEEP sets [FULLSLEEP] bit, but the EVSW might still display the bit clear. The FULL SLEEP mode can be verified by measuring the current consumption of the gauge. In this mode, the high frequency oscillator is turned off. The power consumption is further reduced compared to the SLEEP mode.
While in FULL SLEEP mode, the fuel gauge can suspend serial communications as much as 4 ms by holding the communication line(s) low. This delay is necessary to correctly process host communication since the fuel gauge processor is mostly halted. For HDQ communication one host message will be dropped.