STMPE812ABJR STMicroelectronics, STMPE812ABJR Datasheet - Page 28

• 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

PWM controller
10
10.1
PWM clock div register
Address:
Type:
Reset:
Description:
28/53
7
0
BurstLength [1:0]
PWM controller
The PWM allows the brightness control of a LED/motor driver.
The PWM uses base clock that is ½ of the OSC frequency (typically 600 kHz). The base
clock is divided by a programmable DIV[4:0], which scales it to 18.75-600 kHz. This clock
goes into PWM controller and outputs a signal that is pulse-width modulated (16 steps), with
a frequency 16 times smaller.
Register map for PWM function
Table 10.
[7:5] BurstLength[2:0]
[4:0] Div[4:0]
Address
6
0
0x50
0x51
0x50
R/W
0x00
PWM clock divider register.
Burst length of PWM output
‘000’ – 8 ms
‘001’ – 16 ms
‘010’ – 32 ms
‘011’ – 64 ms
‘100’ – 128 ms
‘101’ – 256 ms
‘110’ – 512 ms
‘111’ – 1024 ms
PWM controller is based on 600KHz clock divided by (Div[4:0] + 1).
Effectively, PWM clock is:
600 KHz (MAX)
600 KHz/32 = 18.75 KHz (MIN)
PWM function registers
5
0
PWM_Control_1
Register name
PWM_ClockDiv
4
0
Doc ID 18225 Rev 4
Bit
8
8
3
0
Type
R/W
R/W
2
0
Reset
0x00
0x00
DIV[4:0]
PWM clock divider register
PWM clock divider
Master control of PWM channel 1
Output at port 0
1
0
Description
STMPE812A
0
0