Preliminary

TTP229-HSB

09’/12/22

Page 6 of 12

Ver : 1.1

2. Input keys number

The TTP229-HSB has only 8 keys input mode.

3. Output mode

The TTP229-HSB only has a 2-wires serial output interface mode.

At the serial output interface mode the SDO pin is data output pin, the SCL is clock input pin, both

is not used resistor connected to VSS. Another it is active-high that is used a high-value resistor

connected to VSS.

The 2-wires serial mode supports always polling data for other device on the system. Or other device

can wait that TTP229-HSB outputs the data valid (DV) signal by the SDO pin, and it can give the

clock signal to TTP229-HSB SCL pin and get the key data from SDO pin.

The TTP229-HSB 2-wires serial interface supports a timeout mechanism for SCL pin. If the SCL pin

has no signal edge change over 2ms, the 2-wires serial interface will reset itself and return to stand-by

state.

2-wires serial interface mode timing please see below：

The D0~D7 correspond to data of the TP0~TP7.

3-4-1. When TP1=0：Set 8-keys active-high

Tw

Tw

Tout

T_resp

DV

D0

D1

C_1

C_0

DV

SDO

SCL

F_SCL

D0

D1

C_1

C_0

D7

D6

D5

D4

D3

D2

C_7

C_6

C_5

C_4

C_3

C_2

Figure 3-4-1: The timing for active-high

3-4-2. When TP1=1：Set 8-keys active-low

Tw

Tw

Tout

T_resp

DV

D0

D1

C_1

C_0

DV

SDO

SCL

F_SCL

D0

D1

C_1

C_0

D7

D6

D5

D4

D3

D2

C_7

C_6

C_5

C_4

C_3

C_2

Figure 3-4-2: The timing for active-low

The parameters for figure 3-4-1~2:

Parameter

Min.

Typ.

Max.

Unit

DV

-

93

-

us

Tw

10

-

-

us

Tout

-

2

-

ms

T_resp

-

16

-

ms

F_SCL

1K

-

512K

Hz