TTP259-ASFN datasheet(75/81 Pages) TONTEK

75 / 81 page

Preliminary

TTP259

TonTouch

2015/05/25

Page 75 of 81

Ver: 1.1

TPCT2~TPCT0 duty counter as initial value and start the scan function.

As writing the TPCTL register (exclude select TP STOP) will reload the

12-bit duty counter and clear the TPCTF and TPCMPF.

As touch pad analog switch keeps on, the relative IO port is disabled as

tri-state by hardware.

CSAL[218H]: Select Capacity load low nibble register [R/W], default value [0000]

Bit3

Bit2

Bit1

Bit0

Bit Name

CSA3

CSA2

CSA1

CSA0

Read/Write

R/W

CSA3~CSA0: Select Capacity load low nibble data for touch pad.

CSAH[219H]: Select Capacity load high nibble register [R/W], default value [--00]

Bit3

Bit2

Bit1

Bit0

Bit Name

CSA5

CSA4

Read/Write

R/W

CSA5~CSA4: Select Capacity load high nibble data for touch pad.

CSA5~CSA0

Extra capacity load

00 0000

0 * C array unit

00 0001

1 * C array unit

……

11 1110

62 * C array unit

11 1111

63 * C array unit

Note: C array unit = 0.25pf

TTP259-ASFN Datasheet(PDF) 75 Page - Tontek Design Technology

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