SC623A 查看數據表（PDF） - Semtech Corporation

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SC623A

LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, and I2C Interface

Semtech Corporation 

SC623A

Pin Descriptions

Pin #

1

2

3

4

5

6

7

8

9

10

Pin Name

C2-

PGND

FL

BL1

BL2

BL3

BL4

AGND

SCL

FLEN

11

SDA

12

EN

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 1μF 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

I2C clock input pin

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

I2C bi-directional data pin — used for read and write operations for all internal registers (refer to

Register Map and I2C Interface sections)

Chip enable — active high — low state resets all registers (see register map table)

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 1μF capacitor connected to C2-

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

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

Negative connection to bucket capacitor 1 — requires a1μF capacitor connected to C1+

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

vias — not connected internally

9

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