TTP259-ASFN datasheet(74/81 Pages) TONTEK

74 / 81 page

Preliminary

TTP259

TonTouch

2015/05/25

Page 74 of 81

Ver: 1.1

When TPCHS0 is writing, TPCTL will be set TP RUN mode, and begin to

scan the channel by TPCHS3~TPCHS0 select.

Users can enable multi-channel by setting corresponding bit 1, that will

turn on all enable channel at the same time.

TPCTL[214H]: Touch pad control register [R/W], default value [-000]

Bit3

Bit2

Bit1

Bit0

Bit Name

TPCTL2

TPCTL1

TPCTL0

Read/Write

R/W

TPCTL2~TPCTL0: Touch pad control selector.

As program writes the TPCTL register, hardware automatically charges the

external capacitor and reload TPCTx and enable the sensor clock input until

period end.

TP STOP: STOP the touch pad feature and release pad for IO port.

TP RUN: TP RUN is touch pad scan start signal, it’s scan the channel by

TPCHS3~TPCHS0 select.

Charge: Charge can hold touch pad in charge state, to avoid charge time

too short.

Inner pad: Select switch select Inner pad. Inner pad is reference pad, this

pad is no bounding to package.

When user writes data to the TPCT2~TPCT0, the data just keep in

TPCT2~TPCT0 latch register. When writing the TPCTL register (exclude select

TP STOP), the TPCT2~TPCT0 latch register’s complement value will load into

TPCTL2~TPCTL0

Channel Enable State

000

TP STOP

001

TP RUN

010

011

Charge

100

Inner pad

101

110

111

TTP259-ASFN Datasheet(PDF) 74 Page - Tontek Design Technology

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