AS1122
Datasheet ꢀ Detailed Description
The input shift register shifts greyscale data into the greyscale register for all channels simultaneously. The complete greyscale data format conꢀ
sists of 12 x 12 bit words, which forms a 144ꢀbit wide data packet (see Figure 32) plus the 8ꢀbit for the identifier.
Figure 32. PWM Data Packet Format
The PWM data is only valid if the exact identifier byte was send. Otherwise the data will be ignored.
Command Data
In the command register of the AS1122 some configuration of the device can be done. After sending the correct identifier the 8 bits of the comꢀ
mand register are accessible.
Table 7. Command Register Format
Bit
7:5
4
Bit Name
ꢀ
Default
Access
Bit Description
000
n/a
Read SID
0: normal operation
0
0
W
W
1: read Status Information Register (SID)
3
2
OPEN Test
0: no test is running
1: start OPEN test
Over Temperature
Power down
0: If an overtemperature condition occurs the OUTn are NOT switched off
automatically.
0
W
1: If an overtemperature condition occurs the OUTN are switched off
automatically.
1
0
Display One Time
OEN
0: The PWM is running endless
1: The PWM is running for one cycle
0
0
W
W
0: This bit must be ‘0’ as well as bit3 of the last valid identifier to turn ON all
channels.
1: all channels are OFF
The complete status information data packet is shown in Figure 33.
Figure 33. Command Packet Format
www.austriamicrosystems.com/LEDꢀDriverꢀICs
Revision 1.00
14 ꢀ 22
AMSCO [ AMS(艾迈斯) ]
