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SC624A Datasheet(PDF) 11 Page - Semtech Corporation

Part # SC624A
Description  LED Light Management Unit Charge Pump, 4 LEDs, Dual LDOs,and I2C Interface
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC624A Datasheet(HTML) 11 Page - Semtech Corporation

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SC624A
11
Pin Descriptions
Pin #
Pin Name
Pin Function
1
C2-
Negative connection to bucket capacitor 2 — requires a 1μF capacitor connected to C2+
2
PGND
Ground pin for high current charge pump
3NC
Unused pin
do not terminate
4
BL1
Current sink output for main backlight LED 1
leave this pin open if unused
5
BL2
Current sink output for main backlight LED 2
leave this pin open if unused
6
BL3
Current sink output for main backlight LED 3
leave this pin open if unused
7
BL4
Current sink output for main backlight LED 4
leave this pin open if unused
8
AGND
Analog ground pin
connect to ground and separate from PGND current
9
SCL
I2C clock input pin
10
NC
Unused pin
do not terminate
11
SDA
I2C bi-directional data pin — used for read and write operations for all internal registers (refer to
Register Map and I2C Interface sections)
12
EN
Chip enable — active high — low state resets all registers (see register map table)
13
BYP
Bypass pin for voltage reference — connect with a 22nF capacitor to AGND
14
LDO2
Output of LDO2 — connect with a 1μF capacitor to AGND
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 2.2μF
capacitor to PGND
17
C2+
Positive connection to bucket capacitor 2 — requires a 1μF capacitor connected to C2-
18
C1+
Positive connection to bucket capacitor 1 — requires a 1μF capacitor connected to C1-
19
VIN
Battery voltage input — connect with a 1μF capacitor to PGND
20
C1-
Negative connection to bucket capacitor 1 — requires a 1μF capacitor connected to C1+
T
THERMAL PAD
Thermal pad for heatsinking purposes — connect to ground plane using multiple
vias — not connected internally


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