SC624A(2007) Ver la hoja de datos (PDF) - Semtech Corporation
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SC624A
(Rev.:2007)
(Rev.:2007)
Semtech Corporation
SC624A Datasheet PDF : 23 Pages
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SC624A
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
9
10
Pin Name
C2-
PGND
NC
BL1
BL2
BL3
BL4
AGND
SCL
NC
11
SDA
12
EN
13
BYP
14
LDO2
15
LDO1
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
Unused pin — do not terminate
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
Unused pin — do not terminate
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)
Bypass pin for voltage reference — connect with a 22nF capacitor to AGND
Output of LDO2 — connect with a 1μF capacitor to AGND
Output of LDO1 — connect with a 1μF capacitor to AGND
Charge pump output — all LED anode pins should be connected to this pin — requires a 2.2μF
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 1μF capacitor to PGND
Negative connection to bucket capacitor 1 — requires a 1μF capacitor connected to C1+
Thermal pad for heatsinking purposes — connect to ground plane using multiple
vias — not connected internally
11
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