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