STMPE821_09 datasheet(44/55 Pages) STMICROELECTRONICS

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Basic PWM controller

STMPE821

44/55

PWM_n_SETUP

PWM_n setup register (n=0-3)

Address:

0xB0

Type:

R/W

Reset:

0x00

Description:

PWM setup register.

654

3210

BRIGHTNESS

TIMING

[7:4] BRIGHTNESS:

This defines the duty cycle during the ON period of the PWM channel output which in turn

determines the brightness level of the LED that the PWM output drives.

0000: Duty cycle ratio 1:15 (6.25%, minimum brightness)

0001: Duty cycle ratio 2:14 (12.50%)

0010: Duty cycle ratio 3:13 (18.75%)

0011: Duty cycle ratio 4:12 (25.00%)

0100: Duty cycle ratio 5:11 (31.25%)

0101: Duty cycle ratio 6:10 (37.50%)

0110: Duty cycle ratio 7: 9 (43.75%)

0111: Duty cycle ratio 8: 8 (50.00%)

1000: Duty cycle ratio 9: 7 (56.25%)

1001: Duty cycle ratio 10: 6 (62.50%)

1010: Duty cycle ratio 11: 5 (68.75%)

1011: Duty cycle ratio 12: 4 (75.00%)

1100: Duty cycle ratio 13: 3 (81.25%)

1101: Duty cycle ratio 14: 2 (87.50%)

1110: Duty cycle ratio 15: 1 (93.75%)

1111: Duty cycle ratio 16: 0 (100.00%, maximum brightness)

[3:1] TIMING[3:0] is the time unit from which the duration of the ON period and OFF period is

defined in:

"000" = 20 mS

"001" = 40 mS

"010" = 80 mS

"011" = 160 mS

"100" = 320 mS

"101" = 640 mS

"110" = 1280 mS

"111" = 2560 mS

[0] Write '1' to activate ramp mode

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