SLUU151 – April 2003
5
bq26220EVM-001 Single Cell Battery Monitor Evaluation Module
2
Circuit Module
The circuit module in the bq26220EVM-001 is a complete and compact example solution for battery
monitoring of a single-cell Li-on pack.The circuit module incorporates a bq26220 battery monitor IC and all
other components necessary to accurately protect and monitor the charge and discharge of one Li-Ion
cell. This EVM can also be used for 3-series NiMH applications.
Contacts on the circuit module provide direct connection to the cell (BAT+, BAT–) and the serial
communications port (HDQ).The system load and charger connect across PACK+ and PACK–.
2.1
Pin Descriptions
•
BAT+/PACK+
Cell positive/pack positive
•
BAT–
Cell negative
•
PACK–
Pack negative
•
HDQ
Serial communications port
•
STAT
Status output
•
GPIO
Programmable input/output port
2.2
Circuit Module Schematic
The schematic shows the circuit for the bq26220EVM-001 implementation.
2.2.1
Schematic
Figure 1
is the bq26220EVM-001 (SLUP165) circuit module schematic diagram.
1
2
3
4
8
7
6
GPIO
SRP
SRN
BAT
RBI
VCC
VSS
HDQ
U1
bq26220PW
J2
D2
5.6 V
D1
5.6 V
1
J1
HDQ
1
2
5
3
1
2
PACK+
GPIO
PACK–
BAT–
R7 100 k
Ω
UDG–03024
R6 20 m
Ω
R5 100 k
Ω
R3 100
Ω
R1
100
Ω
R2
100
Ω
C2
0.1
µ
F
C3
0.1
µ
F
C2
0.1
µ
F
R4
100
Ω
NOTE: R1, R2, and D1 are required for external use only.
Figure 1. bq26220EVM–001 Schematic
