BQ2019PW Datasheet, PDF (9/27 Pages) Texas Instruments – ADVANCED BATTERY MONITORIC

bq2019
ADVANCED BATTERY MONITOR IC
SLUS465E – DECEMBER 1999 – REVISED FEBRUARY 2003
APPLICATION INFORMATION
REG output (continued)
low-power operation
The bq2019 begins low-power operation in response to the host issuing the sleep command. Before entering
the low-power state, the host processor should write the command to transfer the registers to flash. After the
sleep command is sent and the charge/discharge activity is less than the value indicated by the WOE bits shown
in Table 3, the chip clock is powered down and data-acquisition functions cease except for self-discharge
updates. Setting the WOE bits to 0 causes the device to enter sleep mode, regardless of the level of
charge/discharge activity. During device sleep the bq2019 periodically wakes briefly to update the temperature
registers and self-discharge rate. The bq2019 wakes on either a low-to-high or high-to-low transition on the HDQ
pin.
Table 2. Operational States
MODE
Normal
Sleep
ACTIVE REGISTERS
CCR, DCR, CTC, DTC, SCR
SCR
Table 3. WOE Thresholds
WOE3_–1 (HEX)
0h
1h
2h
3h
4h
5h
6h
7h
VWOE (mV)
NA
3.516
1.758
1.172
0.879
0.703
0.586
0.502
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
9