BQ29311_15 Datasheet, PDF (13/24 Pages) Texas Instruments – FOUR-CELL LITHIUM-ION

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SCLK
Not Recommended for New Designs
bq29311
SLUS487D − DECEMBER 2001 − REVISED NOVEMBER 2003
SDATA
A6 A5 A0 R/W ACK
Start
00
Slave Address
R7 R6 R0 ACK
A6 A5
A0 R/W ACK
Register
Address
Stop
Start
Slave Address
NOTE: _{Slave = bq29311}
Figure 6. I²C-Bus Read from bq29311: Protocol B
D7
D0
Slave
Drives
The Data
NACK
Master
Drives
NACK
and Stop
Stop
REGISTER MAP
The bq29311 has nine addressable registers. These registers provide status, control, and configuration information for the
battery-protection system. All registers except for status are read/write. All registers are reset on power up of the bq29311.
NAME
ADDRESS
TYPE
DESCRIPTION
STATUS
0x00
R
bq29311 status
CONTROL
0x01
R/W
bq29311 control from system host
SDV
0x02
R/W
Brownout/shutdown threshold voltage
OCVD
0x03
R/W
Overcurrent threshold voltage for discharge (overload)
OCVC
0x04
R/W
Overcurrent threshold voltage for charge
OCD
0x05
R/W
Overcurrent and overload delay time
CELL_SELECT
0x06
R/W
Battery cell select for cell translation and balance discharge
SCV
0x07
R/W
Short-circuit threshold voltage for discharge and charge
SCD
0x08
R/W
Short-circuit delay time for discharge and charge
STATUS register
STATUS REGISTER (0X00)
7
6
5
4
3
2
1
0
−
−
SHDN
BRWO
OCCHG
OCDSG
SCCHG
SCDSG
The status register provides information about the current state of the bq29311. Reading the status register clears the
XALERT pin after OCL (CONTROL, b0) has been cleared unless otherwise stated.
STATUS b0 (SCDSG): This bit indicates a short circuit in the discharge direction.
0 = below the short-circuit threshold in the discharge direction (default)
1 = greater than or equal to the short-circuit threshold in the discharge direction
STATUS b1 (SCCHG): This bit indicates a short-circuit in the charge direction.
0 = below the short-circuit threshold in the charge direction (default)
1 = greater than or equal to the short-circuit threshold in the charge direction
STATUS b2 (OCDSG): This bit indicates an overload condition.
0 = less than or equal to the overcurrent threshold in the discharge direction (default)
1 = greater than overcurrent threshold in the discharge direction
STATUS b3 (OCCHG): This bit indicates an overcurrent condition.
0 = less than or equal to the overcurrent threshold in the charge direction (default)
1 = greater than overcurrent threshold in the charge direction
STATUS b4 (BRWO): This bit indicates that the brownout voltage threshold has been reached.
0 = greater than the brownout threshold (default)
1 = less than or equal to the brownout threshold voltage
STATUS b5 (SHDN): This bit shows that the battery voltage has fallen below the shutdown threshold limit, indicating a
shutdown condition.
0 = greater than the shutdown threshold voltage (default)
1 = less than or equal to the shutdown threshold voltage
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