MPR121QR2 Freescale Semiconductor, MPR121QR2 Datasheet - Page 35

• Manufacturer Part Number: MPR121QR2
• Description: IC CTLR TOUCH SENSOR 20-QFN
• Manufacturer: Freescale Semiconductor
• Type: Capacitive, Proximity Sensorr

Specifications of MPR121QR2

• Number Of Inputs/keys: 12 Key
• Data Interface: I²C, Serial
• Voltage - Supply: 1.71 V ~ 3.6 V
• Current - Supply: 29µA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-UQFN, 20-µQFN
• Output Type: Logic
• Interface: I²C
• Input Type: Logic
• Supply Voltage: 2.5 V to 3.6 V
• Dimensions: 3 mm L x 3 mm W x 0.65 mm H
• Temperature Range: - 40 C to + 85 C
• Termination Style: SMD/SMT
• Supply Current: 29µA
• Ic Interface Type: I2C
• Supply Voltage Range: 1.71V To 3.6V
• Sensor Case Style: QFN
• No. Of Pins: 20
• Operating Temperature Range: -40°C To +85°C
• Interface Type: I2C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MPR121QR2; MPR121QR2TR

Sensors
Freescale Semiconductor
TOUCH STATUS REGISTER 1
FILTER DATA HIGH
Table 27. Touch Status Register 1 Field Descriptions
Table 28. Filtered Data High Register Field Descriptions
Reset:
Reset:
EPROXS
OVCF
FDHB
E11S
E10S
Field
Field
E9S
E8S
7:0
W
W
7
4
3
2
1
0
R
R
OVCF
7
0
7
0
0
= Unimplemented
= Unimplemented
Over Current Flag – The Over Current Flag will be set any time the wrong value of
Rext is connected to the MPR121’s Rext pin. This is to protect the part from high
current that could result from an incorrect resistor value.
0 – Correct Rext resistor value
1 – Incorrect Rext resistor value
Electrode PROX Status – The Electrode PROX Status bit shows touched nor not
touched.
0 – Not Touched
1 – Touched
Electrode 11 Status – The Electrode 11 Status bit shows touched or not touched.
0 – Not Touched
1 – Touched
Electrode 10 Status – The Electrode 10 Status bit shows touched or not touched.
0 – Not Touched
1 – Touched
Electrode 9 Status – The Electrode 9 Status bit shows touched or not touched.
0 – Not Touched
1 – Touched
Electrode 8 Status – The Electrode 8 Status bit shows touched or not touched.
0 – Not Touched
1 – Touched
Filtered Data High Bits – The Filtered Data High Bits displays the higher 2 bits of
the 10 bit filtered A/D reading.
00 Encoding 0
~
11 Encoding 3
6
0
0
6
0
0
Figure 40. Filtered Data High Register
Figure 39. Touch Status Register1
5
0
0
5
0
0
EPROXS
4
0
.
4
0
0
Description
Description
E11S
3
0
3
0
0
E10S
2
0
2
0
0
E9S
1
0
1
0
FDHB
E8S
0
0
0
0
MPR121
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