AS1121
Datasheet - P i n o u t
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
CLK
SDI
1
2
24 GSCLK
23 SDO
MODE
OUT0
OUT1
OUT2
OUT3
OUT4
3
4
5
6
7
8
AS1121
Thermal
Pad
33
22 XERR
21 OUT15
20 OUT14
19 OUT13
18 OUT12
17 OUT11
Pin Descriptions
Table 1. Pin Descriptions
Pin Number
1
2
3
4:11
14:21
22
23
24
26
25, 27
12,13,28
29
30
31
32
33
Pin Name
CLK
SDI
MODE
OUT0:OUT7
OUT8:OUT15
XERR
SDO
GSCLK
IREF
VCC
N/C
PD
GND
OEN
LD
Thermal Pad
Description
Serial Data Shift Clock
Serial Data Input
Mode Select input with internal pulldown
MODE = GND: Selects greyscale mode (see Setting Greyscale Brightness on page 14)
MODE = V CC : Selects dor correction mode (see Setting Dot Correction on page 13)
Constant-Current Outputs 0:7
Constant-Current Outputs 8:15
Error Output
0 = LED open detection or overtemperature condition is detected.
1 = Normal operation.
Serial Data Output
Greyscale Clock. Reference clock for greyscale PWM control
Reference Current Terminal
Power Supply Voltage
This pins must not be connected
Power Down
0 = normal operation mode
1 = power down mode
Ground
Blank Outputs
0 = OUT n outputs are controlled by the greyscale PWM control.
1 = OUT n outputs are forced off; the greyscale counter is reset.
Data Latch. The internal connections are switched by pin MODE.
For LD (MODE = GND), the greyscale register receives new data.
For LD (MODE = V CC ), the dot correction register receives new data.
Thermal Pad. This pin must be connected to GND to ensure normal operation.
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