MPR084EJ Freescale Semiconductor, MPR084EJ Datasheet - Page 14

• Manufacturer Part Number: MPR084EJ
• Description: IC CTLR TOUCH SENSR PROX 16TSSOP
• Manufacturer: Freescale Semiconductor
• Type: Capacitiver

Specifications of MPR084EJ

• Number Of Inputs/keys: 8 Key
• Data Interface: I²C, Serial
• Voltage - Supply: 1.8 V ~ 3.6 V
• Current - Supply: 1.62mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP
• Output Type: Voltage
• Interface: I²C
• Input Type: Logic
• Supply Voltage: 3.3 V
• Dimensions: 5 mm L x 4.4 mm W x 1.05 mm H
• For Use With: KITMPR084EVM - KIT EVAL 8-PAD TOUCH MPR084
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 9. Power-Up Register Configurations
MPR084
14
4
4.1
The operating modes of the MPR084 are described in this section. Implementation and functionality of each mode are described.
The Modes of Operation of the MPR084 combine to form a suite of quick response and low power consumption functionality. This
is achieved through 2 Run modes and 2 Stop Modes. The two modes are enabled by toggling the Configuration Register’s DCE
and RUNE bits as shown in
Register. Thus, when changes to registers are needed, enter Stop1 mode, write to the registers and change the mode to “Run”.
4.2
On power-up, the interrupt output IRQ is reset, and IRQ will go high. The registers are reset to the values shown in
FIFO Register
Fault Register
Touch Pad Status Register
Touch Pad Configuration Register
Sensitivity Threshold Registers 1
Sensitivity Threshold Registers 2
Sensitivity Threshold Registers 3
Sensitivity Threshold Registers 4
Sensitivity Threshold Registers 5
Sensitivity Threshold Registers 6
Sensitivity Threshold Registers 7
Sensitivity Threshold Registers 8
Electrode Channel Enable Mask
Register
Maximum Number of Touched
Positions Register
Master Tick Period Register
Touch Acquisition Sample Period
Register
Sounder Configuration Register
Low Power Configuration Register
Stuck Key Timeout Register
Configuration Register
Sensor Information Register
Modes of Operation
Introduction
Initial Power Up
Register Function
Table
8. Note that while in a run mode, the only register that can be written to is the Configuration
Table 8. Mode Enable Register Bits
FIFO is empty
No faults
Touch Pad is untouched
Touch Pad is enabled, without interrupts,
with sounder enabled and Auto-Cal Disabled
Maximum sensitivity
Maximum sensitivity
Maximum sensitivity
Maximum sensitivity
Maximum sensitivity
Maximum sensitivity
Maximum sensitivity
Maximum sensitivity
All channels enabled
4 maximum concurrent touched position
allowed
Master tick period is 10ms
TASP is 1 master tick period
Sounder is globally enabled, 10ms of 1kHz
Low Power Mode is disabled
Stuck key detector disabled
Stop1 Mode. IRQ is disabled
Fixed SensorInfo based on revision
Mode
Stop1
Stop2
Run1
Run2
Power-Up Condition
RUNE
1
1
0
0
DCE
1
0
1
0
Register Address
0x0C
0x0D
0x0A
0x0B
0x0E
0x0F
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x10
0x11
0x12
0x13
0x14
Freescale Semiconductor
HEX Value
0xFF
0xFF
0x40
0x00
0x00
0x81
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x04
0x05
0x01
0x01
0x00
0x00
0x14
Table
Sensors
9.