STMPE812ABJR STMicroelectronics, STMPE812ABJR Datasheet - Page 36

• 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

Touchscreen controller
TSC_DET_CFG2
Address:
Type:
Reset:
Description:
36/53
7
1
Acq_Mode
[7:6] Acq_Mode
[3:0] Z-Divider[3:0]
[5] StatusRead
[4] OpMode
6
0
0x42
R/W
0xB0
Touchscreen controller detection configuration 2 register.
‘00’ – Data acquisition timed by internal timer
‘01’ – Data acquisition triggered by a write to “ACQ” bit
‘10’ – Data acquisition using Host-Controlled Sampling Rate Control. (Default)
‘11’ – Reserved
In mode ‘10’, device sample a complete data set every time host accesses the buffer. After
completion of sampling, device enters hibernate mode, until data is accessed again. (Or PEN-
UP causing interrupt to de-assert)
‘1’ inserts data valid (data available) status read in data port. (Default)
Reading data port in this mode clears the ISR register (equivalent to accessing interrupt status
register)
‘0’ – no data valid (data available) status access by data port
TSC operating mode
‘0’ for 12-bit X,12-bit Y,8-bit Z acquisition
‘1’ for 12-bit X, 12-bit Y only (Default)
This field cannot be written on, when EN=1
Pen-Pressure is internally calculated as a 16-bit integer. As 16-bit resolution is typically not
required for touchscreen operation, STMPE812A right-shifts the value internally by Z-
Divider[3:0].
Z-value read through the TSC Data register is the lowest 8-bit of the shifted value.
StatusRead
5
1
OpMode
4
1
Doc ID 18225 Rev 4
3
0
TSC detection configuration 2 register
2
0
Z-Divider[3:0]
1
0
STMPE812A
0
0