STMPE812ABJR STMicroelectronics, STMPE812ABJR Datasheet - Page 29

• Manufacturer Part Number: STMPE812ABJR
• Description: Touch Screen Converters & Controllers Touchscreen cntrlr S-Touch
• Manufacturer: STMicroelectronics
• Type: Resistive Touch Controllersr

Specifications of STMPE812ABJR

• Rohs: yes
• Input Type: 1 TSC
• Data Rate: 400 kbps
• Resolution: 12 bit
• Interface Type: 4-wire, I2C
• Supply Voltage: 1.65 V to 3.6 V
• Supply Current: 100 uA
• Operating Temperature: - 40 C to + 85 C
• Package / Case: CSP-12
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 1.65 V

STMPE812A
PWM control1 register
Address:
Type:
Reset:
Description:
7
[7:4] This defines the of the PWM channel output which in turn determines the brightness level of
[3:2] BurstMultiplier
6
1 Off_State
0 Enable
Brightness
0x51
R/W
0x00
PWM control1 register.
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)
PWM output continues for time = BurstLength * BurstMultiplier
*If BurstMultiplier = 0, PWM output indefinitely (until PWM is turned OFF)
‘0’ : PWM Output “HI” when PWM not running
‘1’ : PWM Output “LOW” when PWM not running
Writing ‘1’ to this bit starts the PWM controller sequence
Writing ‘0’ has stops it
Reads ‘1’ when PWM is running.
0
5
4
Doc ID 18225 Rev 4
3
BurstMultiplier
0
2
PWM control1 register
Off_State
1
0
PWM controller
Enable
0
0
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