MPR121QR2 Freescale Semiconductor, MPR121QR2 Datasheet - Page 50

• 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

MPR121
50
AN3944: MPR121 Quick Start Guide
INTRODUCTION
applications can all be accommodated by having a device a with a very large range of flexibility. While all of these added features
can allow for a wide range of flexibility, they can also add an unnecessary layer of complication. For advanced users who want
to do more than basic touch detection, additional information can be found in other application notes.
order they are written in is not significant except that register 0x05E, the Electrode Configuration Register must be written last.
Register Address
The MPR121 is Freescale Semiconductor’s top of the line touch sensor and can fit into a wide range of applications. These
To start, the device is configured through an I
0x2C
0x2D
0x4C
0x4D
0x5D
0x2B
0x2E
0x2F
0x30
0x31
0x32
0x41
0x42
0x43
0x44
0x45
0x46
0x47
0x48
0x49
0x4A
0x4B
0x4E
0x4F
0x50
0x51
0x52
0x53
0x54
0x55
0x56
0x57
0x58
0x5E
0x7B
MHD Rising
NHD Amount Rising
NCL Rising
FDL Rising
MHD Falling
NHD Amount Falling
NCL Falling
FDL Falling
ELE0 Touch Threshold
ELE0 Release Threshold
ELE1 Touch Threshold
ELE1 Release Threshold
ELE2 Touch Threshold
ELE2 Release Threshold
ELE3 Touch Threshold
ELE3 Release Threshold
ELE4 Touch Threshold
ELE4 Release Threshold
ELE5 Touch Threshold
ELE5 Release Threshold
ELE6 Touch Threshold
ELE6 Release Threshold
ELE7 Touch Threshold
ELE7 Release Threshold
ELE8 Touch Threshold
ELE8 Release Threshold
ELE9 Touch Threshold
ELE9 Release Threshold
ELE10 Touch Threshold
ELE10 Release Threshold
ELE11 Touch Threshold
ELE11 Release Threshold
Filter Configuration
Electrode Configuration
AUTO-CONFIG Control Register 0
Register Name
2
C serial interface. The following table lists the registers that are initialized. The
Value
0xFF
0x0F
0x0A
0x0F
0x0A
0x0F
0x0A
0x0F
0x0A
0x0F
0x0A
0x0F
0x0A
0x0F
0x0A
0x0F
0x0A
0x0F
0x0A
0x0F
0x0A
0x0F
0x0A
0x0F
0x0A
0x0C
0x0B
0x01
0x01
0x00
0x00
0x01
0x01
0x02
0x04
Application Note
AN3891
AN3891
AN3891
AN3891
AN3891
AN3891
AN3891
AN3891
AN3892
AN3892
AN3892
AN3892
AN3892
AN3892
AN3892
AN3892
AN3892
AN3892
AN3892
AN3892
AN3892
AN3892
AN3892
AN3892
AN3892
AN3892
AN3892
AN3892
AN3892
AN3892
AN3892
AN3892
AN3890
AN3890
AN3889
Freescale Semiconductor
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Sensors