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AS1121

Datasheet - Detailed Descr i pti on

Status Information Data (SID)

The AS1121 contains an integrated status information register, which can be accessed in greyscale mode (MODE = GND). Once the LD signal

latches the data into the greyscale register, the input shift register data is replaced with status information data (see Figure 23).

Open LED and overtemperature flags as well as the dot-correction registers can be read out at pin SDO. The status information data packet is

192 bits wide. Bits 191:176 and 31:16 contain the open LED detection status of each channel (either 191:176 or 31:16 can be used for readout).

Bit 175 contains the thermal error flag status. Bits 167:72 contain the data of the dot-correction register. Bit 15:0 contains the LED shorted flags.

The remaining bits are reserved. The complete status information data packet is shown in Figure 23.

Figure 23. Status Information Data Packet Format

0

X

DC0.0

DC15.5

X

TWF

TEF

LOD0

LOD15

LSB

DC Values

...

...

...

Open LED

Detect Data

Overtempera-

ture Flag

MSB

191

176

175

168

167

72

71

15:0

Bit #

Description

Bit #

Description

191:176

reserved

167:72

Dot Correction Readback (16 x 6 Bit)

175

Temperature Error Flag (TEF, 150ºC, typ)

71:32

reserved

174

Temperature Warning Flag (TWF, 125ºC, typ)

31:16

LED Open Detection (Optional, same as bits 176:191), LOD

173:168

reserved

15:0

reserved

31:16

LOD

174

...