STMPE16M31PXQTR STMicroelectronics, STMPE16M31PXQTR Datasheet - Page 49

• 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

STMPE16M31PX
13.2
13.3
Sensor resolution
The capacitive sensor hardware in the STMPE16M31PX devices has a sensitivity of 15 fF
and a range of 512 steps giving it a dynamic range of 7.5 pF.
The impedance reading is the output of an internal MAF (median averaging filter). As up to
16 samples are taken for each reading, the impedance reading is the sum of 16 of 9-bit
samples.
To allow maximum consistency, the 3 impedance readings are always 13-bit, whichever
MAF setting is used.
The touch variance (TVR) and enviromental variance (EVR) registers are specified in a 9-bit
format. For comparison with the impedances, the TVR and EVR would be internally shifted
4 bits up.
Auto-tuning
The capacitive sensor hardware in the STMPE16M31PX devices has a sensitivity of 15 fF
and a range of 512 steps giving it a dynamic range of 7.5 pF. This means that at any time,
the device is able to sense a change in capacitance up to 7.5 pF. When the channel
capacitance moves out of the 7.5 pF window, the auto tuning feature kicks in to ensure
proper sensing operation.
Doc ID 17058 Rev 2
Touch sensor controller
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