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4.4 Flash Duration Slider

This slider bar selects the Flash Duration and writes the corresponding Flash Duration setting shown in

Table 4 to the Flash Timeout Select Bits (bits [4:0] of the Flash Duration Register). The field to the right of

the Flash Duration slider is updated with the Hexadecimal equivalent of the Flash Timeout Select Bits.

Table 4. Flash Duration

Flash Duration Setting (0-15) t

FLASH

(ms) Flash Duration Setting (15-31) t

FLASH

(ms)

0 32 10 544

1 64 11 576

2 96 12 608

3 128 13 640

4 160 14 672

5 192 15 704

6 224 16 736

7 256 17 768

8 288 18 800

9 320 19 832

A 352 1A 864

B 384 1B 896

C 416 1C 928

D 448 1D 960

E 480 1E 992

F 512 (Default) 1F 1024

4.5 Current Limit Slider

This slider bar selects the Current Limit and writes the corresponding Current Limit Setting shown in

Table 5 to the Current Limit Select Bits (bits [6:5] of the Flash Duration Register). The field to the right is

updated with the Hexadecimal equivalent of the Current Limit Select bits.

Table 5. Switch Current Limit Levels

Current Limit Setting Switch Current Limit (A)

0 1

1 1.5

2 2 (Default)

3 2.5

AN-1742 LM3554 Evaluation Board SNVA646B–January 2009–Revised July 2013

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