Datasheet

bq34z100
SLUSAU1B –MAY 2012–REVISED DECEMBER 2012 www.ti.com
Table 14. ALERT Signal Pins
Config Register
Mode Description ALERT Pin ALERT Pin Name Comment
Hex Code
0 No LED 1 P2 0
1 Single LED 1 P2 1
Filter and FETs are required to
2 4 LED 11 P6 2 eliminate temperature sense pulses.
See APPLICATION SCHEMATICS.
5-LED Expander with I
2
C
3 12 P5 43
Host Comm
10-LED Expander with I
2
C
3 12 P5 93
Host Comm
5-LED Expander with HDQ
4 13 P4 44
Host Comm
10-LED Expander with HDQ
4 13 P4 94
Host Comm
The port used for the Alert output will depend on the mode setting in LED/Comm Configuration as defined in
Table 14. The default mode is 0. The ALERT pin will be asserted by driving LOW. However, note that in
LED/COM mode 2, pin TS/P6, which has a dual purpose as temperature sense pin will be driven low except
when temperature measurements are made each second. Refer to the reference schematic for filter
implementation details if host alert sensing requires a continuous signal.
The ALERT pin will be a logical OR of the selected bits in the new configuration register when asserted in the
Flags register. Default value for Alert Configuration register is 0.
Table 15. Alert Configuration Register Bit Definitions
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
High Byte OTC OTD BATHIGH BATLOW CHG_INH RSVD FC CHG
Low Byte OCVTAKEN ISD TDD RSVD RSVD SOC1 SOCF DSG
OTC: Over-Temperature in Charge condition is detected. ALERT is enabled when set.
OTD: Over-Temperature in Discharge condition is detected. ALERT is enabled when set.
BATHIGH: Battery High bit that indicates a high battery voltage condition. Refer to the data flash
BATTERY HIGH parameters for threshold settings. ALERT is enabled when set.
BATLOW: Battery Low bit that indicates a low battery voltage condition. Refer to the data flash
BATTERY LOW parameters for threshold settings. ALERT is enabled when set.
CHG_INH: Charge Inhibit: unable to begin charging [Charge Inhibit Temp Low, Charge Inhibit
Temp High]. ALERT is enabled when set.
RSVD: Reserved. Do not use.
FC: Full-charge is detected. FC is set when charge termination is reached and FC Set% = –1.
(See CHARGING AND CHARGE TERMINATION INDICATION for details) or State of
Charge is larger than FC Set% and FC Set% is not –1. ALERT is enabled when set.
CHG: (Fast) charging allowed. ALERT is enabled when set.
OCVTAKEN: Cleared on entry to relax mode and set to 1 when OCV measurement is performed in relax
mode. ALERT is enabled when set.
ISD: Internal Short is detected. ALERT is enabled when set.
TDD: Tab Disconnect is detected. ALERT is enabled when set.
SOC1: State-of-Charge Threshold 1 reached. ALERT is enabled when set.
SOCF: State-of-Charge Threshold Final reached. ALERT is enabled when set.
DSG: Discharging detected. ALERT is enabled when set.
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