STMPE16M31PX datasheet(40/75 Pages) STMICROELECTRONICS

40 / 75 page

PWM controller

STMPE16M31PX

40/75

Doc ID 17058 Rev 2

PWM_n_SET

PWM-n setup register

Address:

0x40, 0x44, 0x48, 0x4C, 0x50, 0x54, 0x58, 0x5C

Type:

Reset:

0x00

Description:

Setting of brightness, time unit and ramp-mode.

543

210

BRIGTHNESS

TIMING

RAMPMODE

000

[7:4] BRIGHTNESS:

It defines the duty cycle during the ON period of the PWM channel output in no-ramp mode or

the highest duty cycle to be reached in ramp-mode. The PWM duty cycle 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 ratioo 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).

[3:0] TIMING:

It is the time unit from which the duration of the ON period and OFF period is defined in PWM-

N control register.

‘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] RAMP MODE:

Write ‘1’ to enable ramp-mode

Write ‘0’ to disable ramp-mode which in this setting the output goes to the set brightness level

Obsolete

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- Obsolete

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