SC657 Datasheet, PDF (8/22 Pages) Semtech Corporation – Backlight Driver for 5 LEDs with SemPulseTM Interface

SC657
Pin Descriptions
Pin #
Pin Name
1
BL3
2
BL4
3
BL5
4
NC
5
SPIF
6
GND
7
C2-
8
C1-
9
C1+
10
C2+
11
OUT
12
IN
13
BL1
14
BL2
Pin Function
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
Current sink output for main backlight LED 5 — leave this pin open if unused
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 1
Positive connection to bucket capacitor 1
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 1 — leave this pin open if unused
Current sink output for main backlight LED 2 — leave this pin open if unused