Ver1.0

21

LD1071

16 Channel Output LED Driver with 14 bit PWM Controller

Error Detection Code

Open Check

Output Port status

Error Detection Voltage

Meaning

OFF

OUT Voltage > 0.8V

Normal

OUT Voltage < 0.8V

Open Error

Short Check

OFF

OUT Voltage > 0.8V

Normal

OUT Voltage < 0.8V

Short Error

Error Status Register ( ER[15:0] )

bit15

bit14

bit13

bit12

bit11

bit10

bit9

bit8

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

OUT15 OUT14 OUT13 OUT12 OUT11 OUT10 OUT9 OUT8 OUT7 OUT6

OUT5 OUT4

OUT3 OUT2 OUT1 OUT0

16 bit Shifter Register

DOUT

Error Status Read Command

0 : Normal

1 : Open or Short Error

- Open Error : Output port( OUTn ) is not connected to LED.

- Short Error : Output port( OUTn ) is shorted to GND.

ERROR DETECTION

The LD1071 will be able to detect the error status of LED such as open/short error. This function can be

entered by setting the bits of Error Detection Mode( CR[9:8] ) as 01b( Open Detection ) or 10b( Short

Detection ). The correct meaning of error is defined as follows;

Timing Diagram of Error Status Check

Note *1) In order to keep the Constant Current Value( CR[7:0] ) and Global Latch Mode( CR[10] ) correctly, maybe you need to

read the Configuration Register through the Configuration Register Read Command( 0038h ) prior to set Error

Detection Mode.

CLOCK

DIN

STROBE

DOUT

PWMCK

OUTn

Previous Data

2

115

16

1

2

15

16

C1

C0

C15

D1

D0

D15

2

13

4

13

14

15

16

C1

C0

C3

12

3

15

16

14

Don’t Care

ER15 ER14 ER13

ER1

ER0

Error Status Read Command

Set Error Detection Mode

0034h

003Ch

D[9:8] *1)

Actual Read Operation

The next timing diagram shows the sequence of error status read operation. The actual error status is

read with MSB first after execution of Error Status Read Command. First of all, in order to read the error

status, all the output ports (OUT15~OUT0) should be off. So you need some pre-processing for error

status read. The flow chart will be provided on next page.

C13

C15

C2

C14