MPR084Q Freescale Semiconductor, MPR084Q Datasheet - Page 15

• Manufacturer Part Number: MPR084Q
• Description: IC CTLR TOUCH SENSOR PROX 16-QFN
• Manufacturer: Freescale Semiconductor
• Type: Capacitiver

Specifications of MPR084Q

• 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-QFN Exposed Pad
• Output Type: Voltage
• Interface: I²C
• Input Type: Logic
• Supply Voltage: 3.3 V
• Dimensions: 5 mm L x 5 mm W x 1 mm H
• Supply Current: 41µA
• Ic Interface Type: I2C
• Supply Voltage Range: 1.8V To 3.6V
• Sensor Case Style: QFN
• No. Of Pins: 16
• Operating Temperature Range: -40°C To +85°C
• Filter Terminals: SMD
• Rohs Compliant: Yes
• For Use With: KITMPR084EVM - KIT EVAL 8-PAD TOUCH MPR084
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Sensors
Freescale Semiconductor
4.3
When in Run1 mode the sensor controller will run continuously. During Run1 all the modules are synchronized by the Master Tick
Period. This value can be set by using the Master Tick Period Register as outlined in the following section.
While in this mode all functionality of the MPR084 is enabled; touch detection will occur, and I
This mode is enabled by setting the Configuration Register’s RUNE and DCE bits high.
4.3.1
The Master Tick Period Register is used to set the master tick of this system. All parts of the system are synchronized to this
counter. This register is overridden in all modes except for Run1. When not in Run1 mode, the value of this register is ignored
and 8ms is used for the primary clock. The I
4.4
When in Run2 mode the sensor controller will continue to scan the electrodes but a low power state will be enabled between
each cycle. Because of this, any I
If DCE is enabled the sensor controller transitions between low power and active states. During the active part of the cycle
communication with the sensor controller is possible; however, Freescale always requires users to issue an ATTN signal prior to
initiating communications. Accessing the I
to produce invalid data.
This mode is enabled by setting the Configuration Register’s RUNE bit high and DCE bit low. The only way to exit this mode is
to toggle the Attention Pin, refer to
4.5
When in Stop1 mode the sensor controller will not scan the electrodes. While capacitance sensing is disabled I
communications will still be accepted and the sensor controller will maintain instantaneous response to all register requests. This
is the only mode in which register values can be set.
This mode is enabled by setting the Configuration Register’s RUNE bit low and DCE bit high.
4.6
When in Stop2 mode the sensor controller will not scan the electrodes or accept I
this mode.
This mode is enabled by setting the Configuration Register’s RUNE bit low and DCE bit low. The only way to exit this mode is to
toggle the Attention Pin, refer to
Table 10. Master Tick Period Register Field Descriptions
Run1 Mode
Master Tick Period Register
Run2 Mode
Stop1 Mode
Stop2 Mode
Reset:
Field
MTP
7:0
W
R
7
0
Section
2
C communication that occurs, may or may not respond while the sensor is in this mode
Master Tick Period – The Master Tick Period selects or reports the current value of the
touch sensor controller’s primary clock. The resulting period must be in the range 5ms
to 31ms. If the value is outside of this range the MTP will be set to 00011010.
00000000 Encoding 0 – Sets the primary clock multiplier to 5
~
00011010 Encoding 26 - Sets the primary clock multiplier to 31
Section
= Unimplemented
6
0
4.7.
2
Figure 18. Master Tick Period Register
C interface while DCE mode is enabled without sending an ATTN signal first is likely
4.7.
2
C slave address of the Master Tick Period Register is 0x0E.
5
0
4
0
MTP
Description
3
0
2
C communication. The MPR084 is off during
2
1
2
C communication will be available.
1
0
0
1
2
C
MPR084
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