Datasheet

SYSTEM PARTITIONING DIAGRAM
Coloumb
Counter
HWOver
Current &
ShortCircuit
Protection
CellVoltage
Multiplexer
N-ChannelFET
Drive
PreChargeFET
& GPODDrive
PowerMode
Control
SMBD
GSRN
GSRP ASRN
ASRP
GPOD
ZVCHG CHG DSG
VC5
VC4
VC3
VC2
VC1
SMBC
CellBalancing
Temperature
Measurement
DataFlash
Memory
SMB1.1
Impedance
Track™
GasGauging
SHA-1
Authentication
Over &Under
Voltage
Protection
Voltage
Measurement
OverCurrent
Protection
Oscillator
Charging
Algorithm
FuseBlow
Detectionand
Logic
Over
Temperature
Protection
SAFE PFIN
TS2
TS1
TOUT
PMS
Watchdog
Regulators
RESET
ALERT
REG33
REG25
VCELL+
BA
T
P
ACK
VCC VSS
MSRT
RBI
SystemControl AFEHWControl
Pack-
RSNS
5m -20m typ.W W
Pack+
SMBC
SMBD
bq20z45
GND
VC4
VC3
VC2
VC1
VDD
OUT
CD
bq294xx
1
DSG
2
PACK
3
11
VCC
ALERT
4
12
ZVCHG
PRES
5
13
6
14
PMS
TS2
7
15
VSS
PFIN
8
16
REG33
SAFE
9
17
TOUT
SMBD
10
18
19
VCELL+
SMBC
NC
CHG
38
BAT
37
VC1
VSS
36
28
VC2
RBI
35
27
VC3
REG25
34
26
VC4
VSS
33
25
VC5
MRST
32
24
ASRP
GSRN
31
23
ASRN
GSRP
30
22
RESET
VSS
VSS
29
21
20
GPOD
TS1
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.
bq20z45
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