8

Pin Descriptions

SC657

Pin #

Pin Name

Pin Function



BL3

Current sink output for main backlight LED 3

2

BL4

Current sink output for main backlight LED 4

3

BL5

Current sink output for main backlight LED 5

4

NC

No connection

5

SPIF

SemPulse single wire interface pin — used to enable/disable the device and to configure all regis-

ters (refer to Register Map and SemPulse Interface sections)

6

GND

Ground pin

7

C2-

Negative connection to bucket capacitor 2

8

C-

Negative connection to bucket capacitor 

9

C+

Positive connection to bucket capacitor 

0

C2+

Positive connection to bucket capacitor 2



OUT

Charge pump output — all LED anode pins should be connected to this pin

2

IN

Battery voltage input

3

BL

Current sink output for main backlight LED 

4

BL2

Current sink output for main backlight LED 2