BQ20Z70_15 Datasheet, PDF (3/17 Pages) Texas Instruments – SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK™

Not Recommended For New Designs
bq20z70
www.ti.com
SLUS686B – NOVEMBER 2005 – REVISED JULY 2007
TERMINAL FUNCTIONS
TERMINAL
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/OD
I/OD
I/OD
IA
IA
I
P
P
I
I
Alert interrupt input from bq29330. Connect directly to bq29330 XALERT pin
2^nd thermistor voltage input connection to monitor temperature
1^st thermistor voltage input connection to monitor temperature
32.768kHz output for bq29330 watchdog. Connect directly to bq29330 WDI pin
Active low input to sense system insertion
Active low input to sense secondary protector output status
Active high output to enforce additional level of safety, e.g. fuse blow
SMBus data open drain bidirectional pin used for communication with bq20z70
Not used - leave floating
SMBus clock open drain bidirectional pin used for communication with bq20z70
Data transfer line from and to bq29330. Connect directly to SDATA pin of bq29330
Data clock line to bq29330. Connect directly to SCLK pin of bq29330
VSS
Connection for a small-value resistor to monitor the battery charge and discharge current flow
Connection for a small-value resistor to monitor the battery charge and discharge current flow
Master reset input that forces the device into reset when held low. Connect directly to XRST pin of
bq29330
Negative supply. Both VSS needs to be connected together
Positive supply
Positive differential cell input. Connect directly to CELL+ pin of bq29330
Negative differential cell input. Connect directly to CELL- pin of bq29330
(1) I = Input, IA = Analog input, I/O = Input/output, I/OD = Input/Open-drain output, O = Output, OA = Analog output, P = Power
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted)⁽¹⁾
V_CC relative to V_SS(2)
V_(IOD) relative to V_SS(2)
V_I relative to V_SS(2)
T_A
T_stg
Supply voltage range on VCC pin
XALERT, PFIN, SAFE, SMBD, SMBC, SDATA, SCLK,
TS2, TS1, CLKOUT, PRES, SRP, SRN, MRST, VCELL+,VCELL-
Operating free-air temperature range
Storage temperature range
RANGE
–0.3 V to 2.75 V
–0.3 V to 6.0 V
–0.3 V to V_CC + 0.3 V
–40°C to 85°C
–65°C to 150°C
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating
conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) V_SS refers to Voltage at VSS pin.
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