SC621
11
Pin Descriptions
Pin # Pin Name Pin Function
1 C2- Negative connection to bucket capacitor 2 — requires a 2.2μF capacitor connected to C2+
2 PGND Ground pin for high current charge pump and Flash LED driver
3 FL Current sink output for ash LED(s)
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 GREF
Ground reference — connect to ground
10 FLEN Control pin for ash LED(s) — high = ON, low = OFF
11 SWIF
SemWire single wire interface pin — used to enable/disable the device and to set up all internal
registers (refer to Register Map and SemWire Interface sections)
12 NC Unused pin — do not terminate
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 4.7μF
capacitor to PGND
17 C2+ Positive connection to bucket capacitor 2 — requires a 2.2μF capacitor connected to C2-
18 C1+ Positive connection to bucket capacitor 1 — requires a 2.2μF capacitor connected to C1-
19 VIN
Battery voltage input
— connect with a 2.2μF capacitor to PGND
20 C1- Negative connection to bucket capacitor 1 — requires a 2.2μF capacitor connected to C1+
T THERMAL PAD
Thermal pad for heatsinking purposes
— connect to ground plane using multiple vias — not
connected internally
