TTP229-JQB Datasheet, PDF (7/12 Pages) Tontek Design Technology – 8 KEYS TOUCH PAD DETECTOR IC

Preliminary
TTP229-JQB
TonTouch^TM
4. Key operating mode
The TTP229-JQB has the Single-key and Multi-key functions. These functions are set by TP3(SKMS1)
and TP4(SKMS0) pins. The all 8 keys can use one group, or the 8 keys can distributed into two groups.
The group-1 includes TP0, TP1, TP2, TP3 keys. The group-2 includes TP4, TP5, TP6, TP7 keys. How
to set the function? Please see below table 4-1：
Table 4-1. The functions of TP3(SKMS1) and TP4(SKMS0) option
TP3
TP4
Operating function
(SKMS1) (SKMS0)
1
1
All Single-keys：one group(8keys)
1
0
Two groups operate：group-1=>Single key；group-2=>Single key
0
1
Two groups operate：group-1=>Single key；group-2=>Multi key
0
0
All Multi-keys：one group(8 keys)
Note：1. One group：TP0~TP7.
Two groups：Group-1=>TP0,TP1,TP2,TP3.
Group-2=>TP4,TP5,TP6,TP7.
2. The option states of TP3 and TP4, the〝0〞state is used a high-value resistor connected to
VSS, the〝1〞state is not used resistor connected to VSS.
3. The key detection acknowledges in Single-key function, the priority is by the key scanning
order (from TP0 to TP7) when many keys are touched effectively. It is not by the key
touching strength.
5. Wake-up sampling rate and sampling length at sleep mode
The TTP229-JQB has two kinds of sampling rate at sleep mode. These are 8Hz and 64Hz. The two
functions are selected by TP5(SLWPTM) pin. The TP5(SLWPTM) pin has used a high-value resistor
connected to VSS, it selected the 64Hz sampling rate. Another it is 8Hz that is not used resistor
connected to VSS. The 8Hz sampling is the default.
And TTP229-JQB has two kinds of sampling length at sleep mode. They are 4ms and 2ms that are
selected by TP6(WPSCT) pin. The default is 4ms that TP6(WPSCT) pin is not used resistor connected to
VSS. Another it is 2ms that TP6 pin has used a high-value resistor connected to VSS.
Wake-up sampling timing and length in the sleep mode：
8Hz=>125ms
or
64Hz=>15.6ms
4.0ms or 2.0ms
Wake-up
Detect
clock
6. Maximum key-on time
If some objects cover in the sense pad, and causing the change quantity enough to be detected. To
prevent this, the TTP229-JQB sets a timer to monitor the detection. The timer is the maximum key-on
time. It is set about 80sec at 3V. When the detection is over the timer, the system will return to the
power-on initial state, and the output becomes inactive until the next detection. The function is set via
a high-value resistor connected to the TP7(SKSRT) pin to VSS. The TP7(SKSRT) pin does not has the
resistor, it is set disable the maximum key-on time, then the key acts infinitely, this is the default.
Another it is set enable the maximum key-on time that has a resistor.
If the system needs to use the maximum key-on time enable, so that 2-wires serial output interface
only uses always polling data.
09’/12/22
Page 7 of 12
Ver : 1.1