LM3647 Datasheet, PDF (3/17 Pages) National Semiconductor (TI) – Universal Battery Charger for Li-Ion, Ni-MH and Ni-Cd Batteries

2. Connection Diagram
2.1 Pin Descriptions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Name
SEL3
SEL4
RCIN
GND
Vcc
RESET
LED1
LED2
LED3
VREF
CEXT
CEL
CS
TEMP
DISCHG
SYSOK
BUZZER
PWM
SEL1
SEL2
2.2 Ordering Information
Device
LM3647IM
SEL3
1
SEL4
2
RCIN
3
GND
4
V_CC
5
RESET
6
LED1
7
LED2
8
LED3
9
V_REF 10
20
19
18
17
20-PIN
16
SOIC
15
14
13
12
11
SEL2
SEL1
PWM
BUZZER
SYSOK
DISCHG
TEMP
CS
CEL
CEXT
Top View
Order Number LM3647IM
NS Package Number M20B
I/O
Description
I Input to select charge mode: high = pulse, low = constant
I Input to select maintenance time out, connected to an RC-network
RC-timing pin
Ground
5V, power supply
I Reset pin, active low
O LED output
O LED output
O LED output
I Voltage reference analog input
External Capacitor
I Battery voltage input (through resistor divider)
I Current sense input
I NTC-temperature sensor input
O High when discharging, else low
O System Monitor Output
O Buzzer output
O PWM-output filtered to a DC-level (controls the current)
I Tri-level input, used to select charge type
I Tri-level input, used to select NiCd, NiMH, Li-Ion
Package
20 SOIC
Temperature
-40˚C to +85˚C
3
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