SC653

10

Pin Descriptions

Pin #

Pin Name

Pin Function

1

BYP

Bypass pin for voltage reference — ground C

BYP

to GND1 on ground island.

2

BL1

Current sink output for main backlight LED 1

3

BL2

Current sink output for main backlight LED 2

4

BL3

Current sink output for main backlight LED 3

5

BL4

Current sink output for main backlight LED 4

6

SPIF

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)

7

GND1

Ground pin

BYP

, C

LDO1

, C

LDO2

to GND1 on ground island.

8

LDO1 enable input — active high

9

LDO2 enable input — active high

10

C2-

Negative connection to bucket capacitor 2

11

C1-

Negative connection to bucket capacitor 1

12

C1+

Positive connection to bucket capacitor 1

13

C2+

Positive connection to bucket capacitor 2

14

OUT

Charge pump output — all LED anode pins should be connected to this pin

15

IN

Battery voltage input

16

GND2

Ground Pin

17

LDO1

Output of LDO1 — ground C

LDO1

to GND1 on ground island.

18

LDO2

Output of LDO2 — ground C

LDO2

to GND1 on ground island.

T

THERMAL PAD

Thermal pad for heatsinking purposes — connect to ground plane using multiple vias. This pad is

internally connected to ground and to pins 7 and 16.

NOTES:

(1)

ENL1 must be high for the SPIF interface to control LDO1. When low, ENL1 disables LDO1.

(2)

ENL2 must be high for the SPIF interface to control LDO2. When low, ENL2 disables LDO2.