MPR084 datasheet(11/39 Pages) FREESCALE

11 / 39 page

MPR084

Sensors

Freescale Semiconductor

Preliminary

3.5

Touch Acquisition Sample Period Register

The Touch Acquisition Sample Period Register is used to determine the electrode scan period of the system. The I2C slave

address of the Touch Acquisition Sample Period Register is 0x0F.

Figure 15. Touch Acquisition Sample Period Register

Table 4. Touch Pad Configuration Register Field Descriptions

Field

Description

TPSE

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

BKA

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

ACE

Auto Calibration Enable – The Auto Calibration Enable bit enables or disables the

auto calibration function.

0 Disable

1 Enable

TPRBE

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

TPTBE

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

TPE

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

543210

TASP

Reset:

000001

= Unimplemented

Table 5. Touch Acquisition Sample Register Field Description

Field

Description

7:0

TASP

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

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