SC657ULTRT Semtech, SC657ULTRT Datasheet - Page 8

• Manufacturer Part Number: SC657ULTRT
• Description: Backlight Driver For 5 LEDs With SemPulseTM Interface
• Manufacturer: Semtech

Pin Descriptions
Pin #
0

2
3
4

2
3
4
5
6
7
8
9
Pin Name
GND
OUT
SPIF
C+
C2+
BL3
BL4
BL5
BL
BL2
C2-
C-
NC
IN
Pin Function
Current sink output for main backlight LED 3
Current sink output for main backlight LED 4
Current sink output for main backlight LED 5
No connection
SemPulse single wire interface pin — used to enable/disable the device and to configure all regis-
ters (refer to Register Map and SemPulse Interface sections)
Ground pin
Negative connection to bucket capacitor 2
Negative connection to bucket capacitor 
Positive connection to bucket capacitor 
Positive connection to bucket capacitor 2
Charge pump output — all LED anode pins should be connected to this pin
Battery voltage input
Current sink output for main backlight LED 
Current sink output for main backlight LED 2
—
—
—
—
—
leave this pin open if unused
leave this pin open if unused
leave this pin open if unused
leave this pin open if unused
leave this pin open if unused
SC657
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