STMPE812 datasheet(27/51 Pages) STMICROELECTRONICS

27 / 51 page

STMPE812

PWM controller

Doc ID 17732 Rev 3

27/51

PWM control1 register

Address:

0x51

Type:

R/W

Reset:

0x00

Description:

PWM control1 register.

7654

Brightness

BurstMultiplier

Off_State

Enable

[7:4] This defines the of the PWM channel output which in turn determines the brightness level of

the LED that the PWM output drives. Note that this is assuming LED is connected in SINKING

MODE. System host should program the brightness in a reverse way if sourcing configuration

were to be used.

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)

[3:2] BurstMultiplier

PWM output continues for time = BurstLength * BurstMultiplier

*If BurstMultiplier = 0, PWM output indefinitely (until PWM is turned OFF)

1 Off_State

‘0’: PWM Output “HI” when PWM not running

‘1’: PWM Output “LOW” when PWM not running

0Enable

Writing ‘1’ to this bit starts the PWM controller sequence

Writing ‘0’ has stops it

Reads ‘1’ when PWM is running.

Obsolete

Product(s)

- Obsolete

Product(s)

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