Datasheet

bq20z65-R1
SLUS990 –DECEMBER 2009 www.ti.com
TERMINAL FUNCTIONS
TERMINAL
I/O
(1)
DESCRIPTION
NO. NAME
1 DSG O High side N-chan discharge FET gate drive
Battery pack input voltage sense input. It also serves as device wake up when device is in shutdown
2 PACK IA, P
mode.
Positive device supply input. Connect to the center connection of the CHG FET and DSG FET to
3 VCC P
ensure device supply either from battery stack or battery pack input
4 ZVCHG O P-chan pre-charge FET gate drive
High voltage general purpose open drain output. Can be configured to be used in pre-charge
5 GPOD OD
condition
Pre-charge mode setting input. Connect to PACK to enable 0v pre-charge using charge FET
6 PMS I connected at CHG pin. Connect to VSS to disable 0V pre-charge using charge FET connected at
CHG pin.
7 VSS P Negative supply voltage input. Connect all VSS pins together for operation of device
8 REG33 P 3.3V regulator output. Connect at least a 2.2μF capacitor to REG33 and VSS
9 TOUT P Thermistor bias supply output
10 VCELL+ - Internal cell voltage multiplexer and amplifier output. Connect a 0.1μF capacitor to VCELL+ and VSS
Alert output. In case of short circuit condition, overload condition and watchdog time out this pin will
11 ALERT OD
be triggered.
12 NC - Not used - leave floating
13 TS1 IA 1
st
Thermistor voltage input connection to monitor temperature
14 TS2 IA 2
nd
Thermistor voltage input connection to monitor temperature
15 PRES I Active low input to sense system insertion. Typically requires additional ESD protection.
Active low input to detect secondary protector status, and to allow the bq20z65-R1 to report the
16 PFIN I
status of the 2
nd
level protection input.
17 SAFE OD Active high output to enforce additional level of safety protection; e.g., fuse blow.
SMBus data open-drain bidirectional pin used to transfer address and data to and from the
18 SMBD I/OD
bq20z65-R1
19 NC - Not used - leave floating
SMBus clock open-drain bidirectional pin used to clock the data transfer to and from the
20 SMBC I/OD
bq20z65-R1
Display control for the LEDs. This pin is typically connected to VCC via a 100kΩ resistor and a push
21 DISP I
button switch connected to VSS.
22 VSS P Negative supply voltage input. Connect all VSS pins together for operation of device
23 LED1 I LED1 display segment that drives an external LED depending on the firmware configuration
24 LED2 I LED2 display segment that drives an external LED depending on the firmware configuration
25 LED3 I LED3 display segment that drives an external LED depending on the firmware configuration
26 LED4 I LED4 display segment that drives an external LED depending on the firmware configuration
27 LED5 I LED5 display segment that drives an external LED depending on the firmware configuration
28 GSRP IA Coulomb counter differential input. Connect to one side of the sense resistor
29 GSRN IA Coulomb counter differential input. Connect to one side of the sense resistor
Master reset input that forces the device into reset when held low. Must be held high for normal
30 MRST I
operation. Connect to RESET for correct operation of device
31 VSS P Negative supply voltage input. Connect all VSS pins together for operation of device
32 REG25 P 2.5V regulator output. Connect at least a 1mF capacitor to REG25 and VSS
RAM / Register backup input. Connect a capacitor to this pin and VSS to protect loss of RAM /
33 RBI P
Register data in case of short circuit condition.
34 VSS P Negative supply voltage input. Connect all VSS pins together for operation of device
35 RESET O Reset output. Connect to MSRT.
36 ASRN IA Short circuit and overload detection differential input. Connect to sense resistor
37 ASRP IA Short circuit and overload detection differential input. Connect to sense resistor
(1) I = Input, IA = Analog input, I/O = Input/output, I/OD = Input/Open-drain output, O = Output, OA = Analog output, P = Power
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