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Revision 1.01

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AS1121

Datasheet - Pinout

4 Pinout

Pin Assignments

Figure 2. Pin Assignments (Top View)

Pin Descriptions

Table 1. Pin Descriptions

Pin Number

Pin Name

Description

1CLK

Serial Data Shift Clock

2SDI

Serial Data Input

3MODE

Mode Select input with internal pulldown

MODE = GND: Selects greyscale mode (see Setting Greyscale Brightness on page 14)

4:11

OUT0:OUT7

Constant-Current Outputs 0:7

14:21

OUT8:OUT15

Constant-Current Outputs 8:15

22

XERR

Error Output

0 = LED open detection or overtemperature condition is detected.

1 = Normal operation.

23

SDO

Serial Data Output

24

GSCLK

Greyscale Clock. Reference clock for greyscale PWM control

26

IREF

Reference Current Terminal

25, 27

VCC

Power Supply Voltage

12,13,28

N/C

This pins must not be connected

29

PD

Power Down

0 = normal operation mode

1 = power down mode

30

GND

Ground

31

OEN

Blank Outputs

0 = OUTn outputs are controlled by the greyscale PWM control.

1 = OUTn outputs are forced off; the greyscale counter is reset.

32

LD

Data Latch. The internal connections are switched by pin MODE.

For LD (MODE = GND), the greyscale register receives new data.

33

Thermal Pad

Thermal Pad. This pin must be connected to GND to ensure normal operation.

Thermal

Pad

24 GSCLK

23 SDO

22 XERR

21 OUT15

20 OUT14

19 OUT13

18 OUT12

17 OUT11

8

OUT4

7

OUT3

6

OUT2

5

OUT1

4

OUT0

3

MODE

2

SDI

1

CLK

AS1121

33