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
I
2
C clock input pin
10 NC
Unused pin
— do not terminate
11 SDA
I
2
C bi-directional data pin — used for read and write operations for all internal registers (refer to
Register Map and I
2
C 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
