MPR084EJ Freescale Semiconductor, MPR084EJ Datasheet - Page 11

• 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
3.5
The Touch Acquisition Sample Period Register is used to determine the electrode scan period of the system. The I
address of the Touch Acquisition Sample Period Register is 0x0F.
Table 4. Touch Pad Configuration Register Field Descriptions
Table 5. Touch Acquisition Sample Register Field Description
Touch Acquisition Sample Period Register
Reset:
TPRBE
TPTBE
TPSE
TASP
Field
Field
ACE
BKA
TPE
7:0
W
7
5
4
3
2
0
R
7
0
Figure 15. Touch Acquisition Sample Period Register
= Unimplemented
Touch Pad Sounder Enable – The Touch Pad Sounder Enable bit controls if data
is sent to the sounder.
0 Disable – Click Feedback Off
1 Enable – Click Feedback On
Best Key Algorithm - The Best Key Algorithm, when enabled the Maximum Number
of Touches register is ignored and the algorithm reports the single best key based
upon the BKA algorithm and all electrodes that are decoding a touch.
0 BKA Disabled
1 BKA Enabled
Auto Calibration Enable – The Auto Calibration Enable bit enables or disables the
auto calibration function.
0 Disable
1 Enable
Touch Pad Release Buffer Enable – The Touch Pad Release Buffer Enable bit
determines whether or not data is logged in the FIFO when the touch pad
transitions from a touched to untouched state.
0 Disable – No Release Data Logged
1 Enable – Release Data Logged
Touch Pad Touch Buffer Enable – The Touch Pad Touch Buffer Enable bit
determines whether or not data is logged in the FIFO any time a button is pressed.
0 Disable – Touches are not logged
1 Enable – Touches are logged
Touch Pad Enable – The Touch Pad Enable bit enables or disables the touch
sensor. When disabled, no touches are detected.
0 Disable – Touches not detected
1 Enable – Touches detected
Touch Acquisition Sample Period – The Touch Acquisition Sample Period Field
selects or reports the multiplication factor that is used to determine how often
electrodes are scanned. The resulting factor must be in the range 1 to 32. If the
value is outside of this range the TASP will be set to 00011111.
00000000 Encoding 0 – Sets the TASP multiplication factor to 1
~
00011111 Encoding 31 – Sets the TASP multiplication factor to 32
6
0
5
0
4
0
TASP
Description
Description
3
0
2
0
1
0
0
1
2
C slave
MPR084
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