AS1112
Datasheet - Pinout
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
CLK
SDI
1
2
3
4
5
6
7
8
24 GSCLK
23 SDO
CLK
SDI
1
2
3
4
5
6
7
8
24 GSCLK
23 SDO
MODE
OUT0
OUT1
OUT2
OUT3
OUT4
22 XERR
21 OUT15
20 OUT14
19 OUT13
18 OUT12
17 OUT11
MODE
OUT0
OUT1
OUT2
OUT3
OUT4
22 XERR
21 OUT15
20 OUT14
19 OUT13
18 OUT12
17 OUT11
AS1112
Thermal
Pad
AS1112B
Thermal
Pad
33
33
Pin Descriptions
Table 2. Pin Descriptions
Pin Number Pin Name
Description
Serial Data Shift Clock
Serial Data Input
1
2
CLK
SDI
Mode Select input with internal pulldown
MODE = GND: Selects greyscale mode (see Setting Greyscale Brightness on page 12).
MODE = VCC: Selects dot correction mode (see Setting Dot Correction on page 11).
Constant-Current Outputs 0:7
3
MODE
4:11
OUT0:OUT7
OUT8:OUT15
Constant-Current Outputs 8:15
14:21
Error Output
0 = LED open detection or overtemperature condition is detected.
1 = Normal operation.
22
XERR
Serial Data Output
23
24
SDO
GSCLK
TEST
XTEST
IREF
Greyscale Clock. Reference clock for greyscale PWM control
Test Pin This pin must be connected to GND (AS1112) to ensure normal operation.
Test Pin This pin must be connected to VCC (AS1112B) to ensure normal operation.
Reference Current Terminal
25
26
27
Power Supply Voltage
VCC
This pin must not be connected.
12,13,28
N/C
Power Down input with internal pulldown (AS1112)
0 = normal operation mode
1 = powerdown mode
PD
29
Not Connected (AS1112B)
N/C
Ground
30
31
GND
Blank Outputs
0 = OUTn outputs are controlled by the greyscale PWM control.
1 = OUTn 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 = VCC), the dot correction register receives new data.
OEN
32
33
LD
Thermal Pad. This pin must be connected to GND to ensure normal operation.
Thermal Pad
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