MPR084EJ Freescale Semiconductor, MPR084EJ Datasheet - Page 16

• 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

MPR084
16
4.7
The Configuration Register allows a user to reset the part, adjust Interrupt settings, and change the mode. The I
of the Configuration Register is 0x13.
4.8
The Attention (ATTN) pin allows a user to externally set the Configuration Register’s DCE bit high. This is latched on a high to
low transition. Since the current mode of the device is enabled through the DCE this will cause duty cycling to be disabled and
change the current mode from Run2 to Run1, or Stop2 to Stop1 (depending on the previous state).
When in Run2 or Stop2 modes this is the only way to enable the I
Table 11. Configuration Register Field Descriptions
Configuration Register
Attention Pin
Reset:
IRQEN
RUNE
IRQR
Field
DCE
RST
7:5
W
4
2
1
0
R
0
7
= Unimplemented
Interrupt Rate – The Interrupt Rate Field selects the amount to multiply the MTP by
to determine the minimum delay between sequential Interrupts.
000 Encoding 0 – Sets the IRQR multiplication factor to 1
~
111 Encoding 7 – Sets the IRQR multiplication factor to 8
Reset – Asserts a global reset of the sensor controller.
0 Reset Asserted
1 Reset Not Asserted
Duty Cycle Enable – The Duty Cycle Enable bit enables or disables duty cycling on
the MPR084. This bit is active low.
0 Duty Cycle Enabled (2 modes)
1 Duty Cycle Disabled (1 modes)
Interrupt Enable – The Interrupt Enable bit enables or disables the IRQ
Functionality.
0 IRQ Disabled
1 IRQ Enabled
Run Mode Enable – The Run Mode Enable bit enables or disables scanning of the
electrodes for touch detection. This bit is active high.
0 Electrode Scanning Disabled (Stop modes)
1 Electrode Scanning Enabled (Run modes)
IRQR
6
0
Figure 19. Configuration Register
5
0
RST
4
1
2
C communication.
Description
3
0
0
DCE
2
1
IRQEN
1
0
Freescale Semiconductor
RUNE
0
0
2
C slave address
Sensors