SC623 データシートの表示（PDF） - Semtech Corporation

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SC623

LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, and SemWire™ Interface

Semtech Corporation 

SC623

Pin Descriptions

Pin #

1

2

3

4

5

6

7

8

9

10

Pin Name

C2-

PGND

FL

BL1

BL2

BL3

BL4

AGND

GREF

FLEN

11

SWIF

12

NC

13

NC

14

NC

15

NC

16

VOUT

17

C2+

18

C1+

19

VIN

20

C1-

T

THERMAL PAD

Pin Function

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

Ground pin for high current charge pump and Flash LED driver

Current sink output for flash LED(s)

Current sink output for main backlight LED 1 — leave this pin open if unused

Current sink output for main backlight LED 2 — leave this pin open if unused

Current sink output for main backlight LED 3 — leave this pin open if unused

Current sink output for main backlight LED 4 — leave this pin open if unused

Analog ground pin — connect to ground and separate from PGND current

Ground reference — connect to ground

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

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)

Unused pin — do not terminate

Unused pin — do not terminate

Unused pin — do not terminate

Unused pin — do not terminate

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

pin — requires a 4.7μF capacitor to PGND

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

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

Battery voltage input — connect with a 2.2μF capacitor to PGND

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

Thermal pad for heatsinking purposes — connect to ground plane using multiple

vias — not connected internally

9

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