BQ20Z45 Datasheet, PDF (2/20 Pages) Texas Instruments – SBS 1.1-Compliant Gas Gauge and Protection Enabled With Impedance Track™

bq20z45
SLUS800 – MARCH 2009 .................................................................................................................................................................................................. www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
SYSTEM PARTITIONING DIAGRAM
Pack +
SMBD ^SMBD
SMBC ^SMBC
Pack -
SMB 1.1
Fuse Blow
Detection and
Logic
System Control
Data Flash
Memory
Charging
Algorithm
Over
Temperature
Protection
SHA-1
Authentication
Temperature
Measurement
Oscillator
Over & Under
Voltage
Protection
Over Current
Protection
Pre Charge FET
& GPOD Drive
N-Channel FET
Drive
AFE HW Control
Voltage
Measurement
Impedance
Track ™
Gas Gauging
Coloumb
Counter
HW Over
Current &
Short Circuit
Protection
Power Mode
Control
RBI
MSRT
Watchdog
RESET
ALERT
Cell Voltage
Multiplexer
Cell Balancing
Regulators
VCELL+
VC1
VC2
VC3
VC4
VC5
REG33
REG25
bq20z45
RSNS
5 mW - 20 mW typ.
bq20z45
DBT PACKAGE
(TOP VIEW)
DSG 1
PACK 2
VCC 3
ZVCHG 4
GPOD 5
PMS 6
VSS 7
REG33 8
TOUT 9
VCELL+ 10
ALERT 11
PRES 12
TS1 13
TS2 14
PFIN 15
SAFE 16
SMBD 17
SMBC 18
NC 19
38 CHG
37 BAT
36 VC1
35 VC2
34 VC3
33 VC4
32 VC5
31 ASRP
30 ASRN
29 RESET
28 VSS
27 RBI
26 REG25
25 VSS
24 MRST
23 GSRN
22 GSRP
21 VSS
20 VSS
VC1
VC2
VC3
VC4
VDD
OUT
CD
GND
bq294xx
2
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