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AS1119

Datasheet - Regi s t er Description

Open/Short Test Register (0x09)

The AS1119 can detect open and shorted LEDs. To start this test the according bits have to be set. The result of the open/short test is written in

the Open/Short staturs register (see Table 26). The default setting of this register is 0x00.

The Open/Short test is only checking LEDs which are defined as ON in the Data Frame Registers Table 8 on page 14 or Table 12 on

page 18

. With the bit1 (Full Matrix) all LEDs of the matrixes will be defined as ON and will be tested intependently from the content of the Data

Frame Register. The function of bit1 is only available during the open/short test and not during normal operation.

Shutdown Register (0x0A)

The default setting of this register is 0x00. To get the AS1119 operational the bit D0 has to be set to ‘1’.

I²C Interface Monitoring Register (0x0B)

This register is used to monitor the activity on the I²C bus. If a deadlock situation occurs (e.g. the bus SDA pin is pulled to low and no communi-

cation is possible) the chip will reset the I²C interface and the master is able to start the communication again.

The time window for the reset of the interface of the AS1119 can bes set via 7 bits from 256µs to 33ms. The default setting of this register is

0xFF.

Table 23. Open/Short Test Register Format

0x09 Open/Short Test Register

Bit

Bit Name

Default

Access

Bit Description

7:2

-

000000

n/a

1

Full Matrix

0

R/W

0: all LED’s are available in the matrixes

1: not all LED’s are available in the matrixes

0

Error detection

0

R/W

0: start test

1: no test

Table 24. Shutdown Register Format

0x0A Shutdown Register

Bit

Bit Name

Default

Access

Bit Description

7:1

-

0000000

n/a

0

shutdown

0

R/W

0: shutdown

1: normal operation

Table 25. I²C Interface Monitoring Register Format

0x0B I²C Interface Monitoring Register

Bit

Bit Name

Default

Access

Bit Description

7:2

Time out window

1111111

R/W

0 to 127 => 1 to 128x256µs

0000000: 256µs

........

1111111: 32.7ms

0

I²C Monitor

1

R/W

0: I²C monitoring off

1: I²C monitoring on