ICS1712M GALAXY [Galaxy Power, Inc.], ICS1712M Datasheet - Page 21

• Manufacturer Part Number: ICS1712M
• Description: Charge Controller for Nickel-Cadmium and Nickel-Metal Hydride Batteries
• Manufacturer: GALAXY [Galaxy Power, Inc.]

+ 5 V
V
in
390
+ 5 V
390
(note 3)
Q1 (note 2)
Notes:
1) Value of R3 determined by discharge current and capacity of battery pack.
2) Discharge FET is logic-level compatible in this application.
3) DC return of discharge FET must be connected close to negative battery terminal.
4) Resistor is needed only if a thermistor is used. Value may change depending on thermistor.
5) Regulated supply
6) Power ground; others are signal ground. Connect signal ground to power ground
CONSTANT
FAULT
at negative battery terminal only.
CURRENT
SOURCE
TEMP
1k
CHG
1
2
3
4
5
6
7
8
AVSS
CHG
DCHG
PFN
CMN
OTN
SEL0
VSS
ICS1712
Figure 14: Functional Diagram
THERM
unused
DTSEL
SEL1
MRN
VDD
R3 (note 1)
VIN
RC
+ 5 V (note 5)
16
15
14
13
12
11
10
9
21
4.7µF
+ 5 V
.047µF
16k
100pF
.047µF
R1
R2
(note 6)
+ 5 V
temperature
27k (note 4)
options
10k
@ 25°C
sense
ICS1712
open
@ 45°C