BQ20Z40 Datasheet, PDF (3/18 Pages) Texas Instruments – SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK™ TECHNOLOGY FOR USE WITH THE bq29330

bq20z40
www.ti.com................................................................................................................................................ SLUS801A – FEBRUARY 2009 – REVISED MARCH 2009
TSSOP (PW)
(TOP VIEW)
XALERT 1
TS2 2
TS1 3
CLKOUT 4
PRES 5
PFIN 6
SAFE 7
SMBD 8
NC 9
SMBC 10
20 VCELL-
19 VCELL+
18 VCC
17 VSS
16 MRST
15 SRN
14 SRP
13 VSS
12 SCLK
11 SDATA
PIN FUNCTIONS
PIN
NO.
NAME
1
XALERT
2
TS2
3
TS1
4
CLKOUT
5
PRES
6
PFIN
7
SAFE
8
SMBD
9
NC
10
SMBC
11
SDATA
12
SCLK
13
VSS
14
SRP
15
SRN
16
MRST
17
VSS
18
VCC
19
VCELL+
20
VCELL–
I/O ⁽¹⁾
DESCRIPTION
I
I
I
O
I
I
O
I/OD
–
I/OD
I/O
I/O
–
IA
IA
I
P
P
I
I
Input from bq29330 XALERT output.
2^nd Thermistor voltage input connection to monitor temperature
1^st Thermistor voltage input connection to monitor temperature
32.768-kHz output for the bq29330. This pin should be directly connected to the AFE.
Active low input to sense system insertion. Typically requires additional ESD protection.
Active low input to detect secondary protector output status, and to allow the bq20z40 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 bq20z40
Not used— leave floating
SMBus clock open-drain bidirectional pin used to clock the data transfer to and from the bq20z40
Data transfer to and from bq29330
Communication clock to the bq29330
Connected I/O pin to VSS
Connections for a small-value sense resistor to monitor the battery charge- and discharge-current
flow
Connections for 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
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
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