MPR084EJ Freescale Semiconductor, MPR084EJ Datasheet - Page 19

• 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

Sensors
Freescale Semiconductor
6
6.1
The MPR084 has three primary methods for reporting data in addition to an IRQ output that is described in Chapter 7. The three
output systems are described in this section.
6.2
The Instantaneous output shows the current status of the user interface. This information is displayed in terms of the current
touched pad position that is touched. Only one touch can be shown at a time.
6.2.1 Touch Pad Status Register
The Touch Pad Status Register is a read only register for determining the current status of the touch pad. The I
of the Touch Pad Status Register is 0x02.
Table 13. Touch Pad Status Register Field Descriptions
Output Mechanisms
Introduction
Instantaneous
Field
E1S
E8S
E7S
E6S
E5S
E4S
E3S
E2S
7
6
5
4
3
2
1
0
Reset:
W
R
E8S
7
0
Electrode 8 Status – The Electrode 8 Status bit shows whether or not electrode 8 is touched.
0 Electrode 8 untouched
1 Electrode 8 touched
Electrode 7 Status – The Electrode 7 Status bit shows whether or not electrode 7 is touched.
0 Electrode 7 untouched
1 Electrode 7 touched
Electrode 6 Status – The Electrode 6 Status bit shows whether or not electrode 6 is touched.
0 Electrode 6 untouched
1 Electrode 6 touched
Electrode 5 Status – The Electrode 5 Status bit shows whether or not electrode 5 is touched.
0 Electrode 5 untouched
1 Electrode 5 touched
Electrode 4 Status – The Electrode 4 Status bit shows whether or not electrode 4 is touched.
0 Electrode 4 untouched
1 Electrode 4 touched
Electrode 3 Status – The Electrode 3 Status bit shows whether or not electrode 3 is touched.
0 Electrode 3 untouched
1 Electrode 3 touched
Electrode 2 Status – The Electrode 2 Status bit shows whether or not electrode 2 is touched.
0 Electrode 2 untouched
1 Electrode 2 touched
Electrode 1 Status – The Electrode 1 Status bit shows whether or not electrode 1 is touched.
0 Electrode 1 untouched
1 Electrode 1 touched
= Unimplemented
E7S
6
0
Figure 22. Touch Pad Status Register
E6S
5
0
E5S
4
0
Description
E4S
3
0
E3S
2
0
E2S
1
0
E1S
0
0
2
C slave address
MPR084
19