SC621

11

Pin Descriptions

Pin #

Pin Name

Pin Function

1

C2-

Negative connection to bucket capacitor 2 — requires a 2.2μF capacitor connected to C2+

2

PGND

Ground pin for high current charge pump and Flash LED driver

3

FL

Current sink output for flash LED(s)

4

BL1

Current sink output for main backlight LED 1

5

BL2

Current sink output for main backlight LED 2

6

BL3

Current sink output for main backlight LED 3

7

BL4

Current sink output for main backlight LED 4

8

AGND

Analog ground pin

9

GREF

Ground reference

10

FLEN

Control pin for flash LED(s) — high = ON, low = OFF

11

SWIF

SemWire single wire interface pin — used to enable/disable the device and to set up all internal

registers (refer to Register Map and SemWire Interface sections)

12

NC

Unused pin — do not terminate

13

BYP

Bypass pin for voltage reference — connect with a 22nF capacitor to AGND

14

LDO2

Output of LDO2

15

LDO1

Output of LDO1 — connect with a 1μF capacitor to AGND

16

VOUT

Charge pump output — all LED anode pins should be connected to this pin — requires a 4.7μF

capacitor to PGND

17

C2+

Positive connection to bucket capacitor 2 — requires a 2.2μF capacitor connected to C2-

18

C1+

Positive connection to bucket capacitor 1 — requires a 2.2μF capacitor connected to C1-

19

VIN

Battery voltage input

20

C1-

Negative connection to bucket capacitor 1 — requires a 2.2μF capacitor connected to C1+

T

THERMAL PAD

Thermal pad for heatsinking purposes

connected internally