AN3981 datasheet(23/54 Pages) STMICROELECTRONICS

tên linh kiện	AN3981

Giải thích chi tiết về linh kiện	LED array drivers

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23 / 54 page

AN3981

16-bit LED array drivers

Doc ID 022217 Rev 1

23/54

Figure 25.

Example of error detection with OUT15 and OUT0 faulty and all other

outputs good

3.6.1

Correctness of the error detection results

It is important to underline that the result of the diagnostic process must be compared with

the data loaded into the shift register.

In fact, if a channel is not switched on, the result of the detection is “0” anyway.

It is recommended to follow the approach shown in Figure 26.

Figure 26.

Error detection results interpretation

The correct interpretation of the detection results can be affected by any setup/hold time

problem. Same considerations about

and LE timing done in Section 4.6.3 apply also to

16-bit LED array drivers.

Incorrect error detection results can be due also to an inappropriate choice of the LED

supply voltage. The rules to suitably define the LED supply voltage are discussed in

Section 5.1.

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