STMPE16M31PXQTR STMicroelectronics, STMPE16M31PXQTR Datasheet - Page 22

• Manufacturer Part Number: STMPE16M31PXQTR
• Description: IC CTLR TOUCHKEY 16CHAN 32-QFN
• Manufacturer: STMicroelectronics
• Series: S-Touch™r
• Type: Capacitive, PWM, Ratio Enginer

Specifications of STMPE16M31PXQTR

• Featured Product: STMPE16M31PX
• Number Of Inputs/keys: 16 Key, Slider
• Data Interface: I²C
• Data Rate/sampling Rate (sps, Bps): 100k, 400k
• Voltage Reference: External
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-VFQFN Exposed Pad
• Supply Voltage: 1.65 V to 1.95 V
• Number Of Channels: 16
• Dimensions: 4 mm L x 4 mm W x 0.8 mm H
• Temperature Range: - 40 C to + 85 C
• Termination Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Resolution (bits): -
• Touch Panel Interface: -
• Other names: 497-10738-2

System controller
SYSCON-2
Address:
Type:
Reset:
Description:
22/75
7
[7:5] SCLK_DIV: Sensor clock divider.
[4:3] PCLK_DIV: PWM clock divider
SCLK_DIV
RW
6
1
000, 001: RESERVED
010 : 32 (to be used only if load capacitance is < 30 pF)
011: 64
100: 128
101: 256
110: 512
111: 1024
Sensor clock is 2 MHz / ( PRBS_Factor * SCLK_DIV[2:0] )
PRBS factor is a pseudo-random sequence of number, ranging from 1-8. This is used to reduce
the effect of surrounding EMI on the sensor. Average of this factor is approximately 2.5
Effective sampling rate is 2 MHz/ (2.5*SCLK_DIV[2:0]).
Maximum total sampling rate : 2MHz/(2.5*64) = 12.5 kHz
Minimum total sampling rate : 2 MHz/(2.5*1024) = 780 Hz
If N channel is active, the per-channel sampling rate is “total sampling rate / N”.
Maximum channel sampling rate = 12.5 kHz/24 = 521 Hz
00 for 16 kHz
01 for 32 kHz
10 for 64 kHz
11 for 128 kHz
0x04
R/W
0xFE
Sensor and PWM clock divider. The SYSCON-2 register controls the sensor and
PWM clock speed, and the clock gating of various functional modules.
This bit will always read '0'. as the I2C transaction to read this bit will wake up the
device from hibernate mode.
5
Doc ID 17058 Rev 2
4
PCLK_DIV
RW
1
3
Sensor and PWM clock divider
GPIO_CLK
2
RW
1
PWM_CLK
1
STMPE16M31PX
CS_CLK
RW
0
0