Datasheet
Table Of Contents
- Proximity Capacitive Touch Sensor Controller
- 1 Pin Descriptions
- 2 Schematic Drawings and Implementation
- 3 Device Operation Overview
- 4 Electrical Characteristics
- 5 Register Operation Descriptions
- 5.1 Register Read/Write Operations and Measurement Run/Stop Mode
- 5.2 Touch Status Registers (0x00~0x01)
- 5.3 Electrode Filtered Data Register (0x04~0x1D)
- 5.4 Baseline Value Register (0x1E~0x2A)
- 5.5 Baseline Filtering Control Register (0x2B~0x40)
- 5.6 Touch / Release Threshold (0x41~0x5A)
- 5.7 Debounce Register (0x5B)
- 5.8 Filter and Global CDC CDT Configuration (0x5C, 0x5D)
- 5.9 Electrode Charge Current Register (0x5F~0x6B)
- 5.10 Electrode Charge Time Register (0x6C~0x72)
- 5.11 Electrode Configuration Register (ECR, 0x5E)
- 5.12 Out-Of-Range Status Registers (0x02, 0x03)
- 5.13 Soft Rest Register (0x80)
- 5.14 GPIO Registers (0x73~0x7A)
- 6 MPR121 Serial Communication
- Disclaimer
MPR121
Sensors
22 Freescale Semiconductor, Inc.
6.4 Read and Write Operation Format
< Single Byte Read >
Master
ST Device Address[6:0] W Register Address[7:0] SR Device Address[6:0] R NAK SP
Slave
AK AK AK Data[7:0]
< Multiple Byte Read >
Master
ST Device Address[6:0] W Register Address[7:0] SR Device Address[6:0] R AK
Slave
AK AK AK Data[7:0]
Master
AK AK NAK SP
Slave
Data[7:0] Data[7:0] Data[7:0]
< Single Byte Write >
Master
ST Device Address[6:0] W Register Address[7:0] Data[7:0] SP
Slave
AK AK AK
Legend
ST: Start Condition SP: Stop Condition NAK: No Acknowledge W: Write = 0
SR: Repeated Start Condition AK: Acknowledge R: Read = 1