STMPE821 Datasheet, PDF (44/55 Pages) STMicroelectronics – 8-bit Xpander Logic™ with touchkey controller

Basic PWM controller
PWM_OFF_OUTPUT
PWM group control register
7
6
5
4
3
2
OUT3
OUT2
Address:
Type:
Reset:
Description:
0xA0
R/W
0x00
PWM group control register.
[7:4] RESERVED
[3:0] OUT3:0:
Default is '0'
'1' - PWM channel outputs '1' when disabled
'0' - PWM channel outputs '0' when disabled
RAMP_RATE
7
6
RESERVED
Ramp rate register
5
4
3
2
RAMP_DOWN
Address:
0xB2
Type:
R/W
Reset:
0x00
Description:
Ramp rate register.
[7:6] RESERVED
[5:3] RAMP_DOWN [2:0]:
'000' = 1/4 of time unit per brightness level change
'001' = 1/8 of time unit per brightness level change
'010' = 1/16 of time unit per brightness level change
'011' = 1/32 of time unit per brightness level change
'100' = 1/64 of time unit per brightness level change
'101' = 1/128 of time unit per brightness level change
'110' = reserved
'111' = reserved
[2:0] RAMP_UP [2:0]:
'000' = 1/4 of time unit per brightness level change
'001' = 1/8 of time unit per brightness level change
'010' = 1/16 of time unit per brightness level change
'011' = 1/32 of time unit per brightness level change
'100' = 1/64 of time unit per brightness level change
'101' = 1/128 of time unit per brightness level change
'110' = reserved
'111' = reserved
STMPE821
1
OUT1
0
OUT0
1
0
RAMP_UP
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