BQ20Z90_07 Datasheet, PDF (3/27 Pages) Texas Instruments – SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK™ TECHNOLOGY FOR USE WITH THE bq29330

bq20z90
www.ti.com
SLUS662A – DECEMBER 2005 – REVISED JUNE 2006
TERMINAL FUNCTIONS
TERMINAL
NO.
NAME
1
NC
2
XALERT
3
SDATA
4
SCLK
5
CLKOUT
6
TS1
7
TS2
8
PRES
9
PFIN
10
SAFE
11
SMBD
12
NC
13
SMBC
14
DISP
15
NC
16
LED1
17
LED2
18
LED3
19
LED4
20
LED5
21
VSS
22
SRP
23
SRN
24
MRST
25
VSS
26
VCC
27
RBI
28
NC
29
VCELL+
30
VCELL-
I/O ⁽¹⁾
DESCRIPTION
–
I
I/O
I/O
O
I
I
I
I
O
I/OD
–
I/OD
I
–
O
O
O
O
O
–
IA
IA
I
P
P
P
–
I
I
Not used— leave floating
Input from bq29330 XALERT output.
Data transfer to and from bq29330
Communication clock to the bq29330
32.768-kHz output for the bq29330. This pin should be directly connected to the AFE.
1^st Thermistor voltage input connection to monitor temperature
2^nd Thermistor voltage input connection to monitor temperature
Active low input to sense system insertion and typically requires additional ESD protection
Active low input to detect secondary protector output status and allows the bq20z90 to report the
status of the 2^nd level protection output
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 bq20z90
Not used— leave floating
SMBus clock open-drain bidirectional pin used to clock the data transfer to and from the bq20z90
Display control for the LEDs. This pin is typically connected to bq29330 REG via a 100-kΩ resistor
and a push-button switch to VSS.
Not used— leave floating
LED1 display segment that drives an external LED depending on the firmware configuration
LED2 display segment that drives an external LED depending on the firmware configuration
LED3 display segment that drives an external LED depending on the firmware configuration
LED4 display segment that drives an external LED depending on the firmware configuration
LED5 display segment that drives an external LED depending on the firmware configuration
Connected I/O pin to VSS
Connections to the top of a small-value sense resistor to monitor the battery charge- and
discharge-current flow
Connections to the bottom of a small-value sense resistor to monitor the battery charge- and
discharge-current flow
Master reset input that forces the device into reset when held low. Must be held high for normal
operation
Negative Supply Voltage
Positive Supply Voltage
Backup power to the bq20z90 data registers during periods of low operating voltage. RBI accepts a
storage capacitor or a battery input.
Not used— leave floating
Input from bq29330 used to read a scaled value of individual cell voltages
Input from bq29330 used to read a scaled value of individual cell voltages
(1) I = Input, IA = Analog input, I/O = Input/output, I/OD = Input/Open-drain output, O = Output, OA = Analog output, P = Power
Submit Documentation Feedback
3