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preliminary TTP229-KSF tontouch tm 09?/12/22 page 1 of 18 ver : 1.0 16 keys or 8 keys touch pad detector ic general description the TTP229-KSF tontouch tm ic is capacitive sensing design sp ecifically for touch pad controls. the device built in regulator for touch sensor. stab le sensing method can cover diversity conditions. human interfaces control panel links through non-conducti ve dielectric material. the main application is focused at replacing of the mechanical switch or button. the assp can i ndependently handle the 8 touch pads or up to 16 touch pads. features ? operating voltage 2.4v~5.5v ? built-in regulator ? stand-by current at 3v, and sleep mode slow sampling rate 8hz => typical 2.5ua for 16 input keys => typical 2.0ua for 8 input keys ? provides to set 8 direct keys or 16 direct keys by option ? provides to set 8 separate outputs on ly for 8 direct input keys mode ? has i 2 c-bus slave interface, both can use fo r 8 and 16 direct input keys mode provide a bit slave device address [b1] to set by a0 pin TTP229-KSF slave device identifie r and address => [1010 01(a0)r] ? 8 separate outputs can select output driving types by option (cmos/od/oc with active high/low) ? offer multi-key or single-key feature by option ? provides two kinds of sampling ra te that slow sampling rate 8hz and fast sampling rate 64hz at sleep mode ? have the maximum key-on time about 80sec by pin option ? sensitivity can adjust by the capacitance(1~50pf) outside ? after power-on have about 0.5sec stable-time, during the time do not touch the key pa d, and all functions are disabled ? auto calibration for environment changing and the re-calibration period is about 4.0sec, wh en all keys are not activated for fixed time application ? wide consumer products ? button key replacement
preliminary TTP229-KSF tontouch tm 09?/12/22 page 2 of 18 ver : 1.0 block diagram scl sda control circuit i2c-bus interface a0 test control circuit wake-up detecing slpsenb slpsena senadj3 senadj2 tp15 tp14 tp13 tp12 tp11 tp10 tp9 tp8 system power on circuit circuit sense input & output buffer system oscillator circuit circuit function control and and key scanning timing counter circuit regulator control circuit function option circuit detecting and sense port tp7 tp6 tp5 tp4 senadj1 tp3 tp2 tp1 tp0 senadj0 package configuration a0 tp7 tp6 tp4 tp5 senadj1 vdd vss slpsena sda tp2 tp3 ttp229-k senadj2 tp10 tp11 slpsenb scl tp12 tp13 senadj3 tp14 tp15 tp0 tp1 senadj0 (ssop-28) tp8 test tp9 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
preliminary TTP229-KSF tontouch tm 09?/12/22 page 3 of 18 ver : 1.0 pin description pin no. pin name share pin i/o type pin description 1 slpsena i/o sleep mode sensitiv ity adjustment pin for group-a(tp0~7) 2 tp3 skms1 i/o touch pad input pin(key-3) key action function option- 1(single-key/multi-key) default is all single-key 3 tp2 kysel i/o touch pad input pin(key-2) key number function option(8-keys/16-keys) default is 8-keys 4 senadj0 i/o touch pad tp0~3 sensitivity adjust common pin 5 tp1 sahl i/o touch pad input pin(key-1) output type function option(active high/low) default is active-high for tpq0~7 6 tp0 opden i/o touch pad input pin(key-0) output type function opti on(cmos/od/oc for 8-keys) default is cmos 7 tp15 tpq7 i/o/od touch pad input pin(key-15) 8-keys direct output pin(tpq7) 8 tp14 tpq6 i/o/od touch pad input pin(key-14) 8-keys direct output pin(tpq6) 9 senadj3 i/o touch pad tp12~15 sensitivity adjust common pin 10 tp13 tpq5 i/o/od touch pad input pin(key-13) 8-keys direct output pin(tpq5) 11 tp12 tpq4 i/o/od touch pad input pin(key-12) 8-keys direct output pin(tpq4) 12 sda i/od data pin for the i 2 c-bus serial data interface 13 scl i serial cloc k input pin for the i 2 c-bus serial interface 14 slpsenb i/o sleep mode sensitivity adjustment pin for group-b(tp8~15) 15 tp11 tpq3 i/o/od touch pad input pin(key-11) 8-keys direct output pin(tpq3) 16 tp10 tpq2 i/o/od touch pad input pin(key-10) 8-keys direct output pin(tpq2) 17 senadj2 i/o touch pad tp8~11 sensitivity adjust common pin 18 tp9 tpq1 i/o/od touch pad input pin(key-9) 8-keys direct output pin(tpq1) 19 tp8 tpq0 i/o/od touch pad input pin(key-8) 8-keys direct output pin(tpq0) 20 test i-pl only for test
preliminary TTP229-KSF tontouch tm 09?/12/22 page 4 of 18 ver : 1.0 pin no. pin name share pin i/o type pin description 21 a0 i-ph a0 is input pins for the i 2 c-bus device address selection 22 tp7 sksrt i/o touch pad input pin(key-7) maximum key-on time function option(infinite/80sec) default is infinite 23 tp6 slwptm i/o touch pad input pin(key-6) sleep mode sampling length function option(4.0/2.0ms) default is 4.0ms 24 senadj1 i/o touch pad tp4~7 sensitivity adjust common pin 25 tp5 wpsct i/o touch pad input pin(key-5) sampling rate at sleep mode function option(8hz/64hz) default is 8hz 26 tp4 skms0 i/o touch pad input pin(key-4) key action function option- 0(single-key/multi-key) default is all single-key 27 vdd p positive power supply 28 vss p negative power supply, ground note pin type i cmos input only i-ph cmos input and pull-high resister i-pl cmos input and pull-low resister o cmos push-pull output i/o cmos i/o p power / ground od cmos open drain output (for od tpq0~tpq7 pins have diode protective circuit, sda pin has no diode protective circuit)
preliminary TTP229-KSF tontouch tm 09?/12/22 page 5 of 18 ver : 1.0 electrical characteristics ? absolute maximum ratings ? dc/ac characteristics (test condition at room temperature=25 ) parameter symbol conditions value unit operating temperature t op -40 ~ +85 storage temperature t stg -50 ~ +125 power supply voltage vdd ta=25 c vss-0.3 ~ vss+6.0 v input voltage v in ta=25 c vss-0.3 to vdd+0.3 v human body mode esd 6 kv note vss symbolizes for system ground parameter symbol test condition min. typ. max. unit operating voltage vdd 2.4 - 5.5 v internal regulator output vreg 2.2 2.3 2.4 v operating current (no load) i op vdd=3.0v 20 ua set 8-keys 2.0 sampling rate 8hz set 16-keys 2.5 set 8-keys 5.5 stand-by current (vdd=3.0v) (sampling length 4.0ms) i sd sampling rate 64hz set 16-keys 9.0 ua input ports v il input low voltage 0 - 0.2 vdd input ports v ih input high voltage 0.8 - 1.0 vdd output port sink current i ol vdd=3v, v ol =0.6v - 8 - ma output port source current i oh vdd=3v, v oh =2.4v - -4 - ma vdd=3v, sampling rate 8hz 125 ms wake-up response time (at sleep mode) t wu vdd=3v, sampling rate 64hz 15.6 ms vdd=3v, set 16-keys 32 ms output response time (at operation) t r vdd=3v, set 8-keys 16 ms maximum key-on time t mot 50 80 110 sec input pin pull-low resistor (test) r pl vdd=3v, 30k ohm
preliminary TTP229-KSF tontouch tm 09?/12/22 page 6 of 18 ver : 1.0 function description 1. sensitivity adjustment the total loading of electrode size and capacitance of connecti ng line on pcb can affect the sensitivity. so the sensitivity adjustment must according to the practical application on pcb. the TTP229-KSF offers some methods for adjusting the sensitivity outside. 1-1 by the electrode size under other conditions are fixed. using a larger el ectrode size can increase sensitivity. otherwise it can decrease sensitivity. but the electrode size must use in the effective scope. 1-2 by the panel thickness under other conditions are fixed. using a thinner panel can increase sensitivity. otherwise it can decrease sensitivity. but the panel thickness must be below the maximum value. 1-3 by the value of external capacito r (please see the down figure 1-3-1) under other conditions are fixed. when adding th e values of cj0~cj3 and cjwa and cjwb will reduce sensitivity in the useful range (1pf Q cj0~cj3 Q 50pf, 1pf Q cjwa~cjwb Q 50pf). when do not use any capacitor that means open on th e position of capacitor, the sensitivity is most sensitive. the capacitors cj0~cj3 are used to ad just the sensitivity of keys at operation mode. the capacitors cjwa and cjwb are used to ad just the wake-up sensitivity at sleep mode. about the relation of capacito r and controlled keys pl ease to see below table. the capacitor the keys-group controlled and adjusted cj0 k0~k3 group cj1 k4~k7 group cj2 k8~k11 group cj3 k12~k15 group cjwa k0~k7 group cjwb k8~k15 group note when using the value of capacitor to adjust the sensitivity, recommending to adjust the cj0~cj3 capacitor for k0~k15 first, then adjus ting the cjwa and cjwb capacitor for wake-up sensitivity. a0 scl sda test electrode cjwb slpsenb cjwa k12 k11 k10 k9 k8 k15 k14 k13 cj3 slpsena k7 k6 k5 k4 cj1 vss tp9 tp8 senadj0 tp0 tp7 tp6 tp5 tp4 tp3 tp2 tp1 vdd senadj1 tp15 tp14 tp13 tp12 senadj3 tp11 tp10 senadj2 cj2 cj0 k3 k2 k1 k0 figure 1-3-1
preliminary TTP229-KSF tontouch tm 09?/12/22 page 7 of 18 ver : 1.0 2. input keys number select the TTP229-KSF has 8 keys input mode and 16 keys input mode. these modes are selected via high-value resistor connected to the tp2 (kysel) pin to vss, or not. the default that tp2 (kysel) pin is not used resistor connected to vss is selected 8 keys input mode. another is selected 16 keys input mode that has used a high-valu e resistor connected to vss. 3. output mode the TTP229-KSF has 8 pi ns direct output mode and i 2 c-bus slave interface mode. the output of 16 keys input mode only offer i 2 c-bus slave interface. the 8 keys input mode has two kinds of output that 8 pins direct output and i 2 c-bus slave interface. the 8 pins di rect output only use at 8 keys input mode. 3-1 at the 8 pins direct output mode, the TTP229-KSF has two kinds of out put type that they are cmos type output and od (ope n drain) type output. thes e are selected by the tp0 (opden) pin. the cmos type output is default that the tp0 (opden) pin is not used any component to vss. when the tp0 (opden) pin is used a high-value resistor connect ed to vss, it is selected od type output. 3-2 when selecting 8 pins direct cmos output m ode, the output channels can be set active-high or active-low by tp1 (sahl) pin. the default that the tp1 (sahl) pin is not used a hi gh-value resistor, it is set active-high. when the tp1 (sahl) pin has a high-value resistor connected to vss, it is set active-low. 3-3 at 8 pins direct od out put mode, it has od (open drain) or oc (open collector) output mode to be selected by the tp1 (sahl) pin. the tp1 (sahl) pin has a high-value resistor connected to vss, it is selected oc mode. another it is selected od mode that does not ha s a resistor. the default is od mode. the states of od mode are floating and active -low. and the states of oc mode are floating and active-high. the structure of od and oc output mode please to see the below figure. p n control control tpq0~7 oc mode od mode tpq0~7 note the output pins have diode protective circuit in the chip. so when it selected od or oc mode. do not propose to connect other device that uses th e different voltage. that avoids to occurring the leakage current in the system.
preliminary TTP229-KSF tontouch tm 09?/12/22 page 8 of 18 ver : 1.0 3-4 at i 2 c-bus slave interface mode the sd a pin is a serial data pin, th e scl is a serial clock input pin. the sda and scl pins must be pu lled-high with an external resistor. and the 4-bits identify code for the TTP229-KSF is (1010) . the device address for TTP229-KSF b3-bit is fixed 0 , b2-bit is fixed 1 , b1-bit can be defined by the state of the a0 pin. the pin has pull-high resistor internal, can be set to 0 external. the TTP229-KSF 8-bits slave device address includes 4-bits identifier, 3-bits address and r/w bit (see the table 3-4-1). the TTP229-KSF ic uses the i 2 c-bus slave interface data transmission protocol to output the data of the touch pads (tp0~tp15 pins), so the ttp229-k sf only accepts the read operation that r/w bit is 1 . if it is 0 , the TTP229-KSF will not respond the write operation. otherwise, the i 2 c-bus slave interface of TTP229-KSF conf orms to the communication protocols. it supports the fast mode that the maximum scl clock frequency is 400khz. the i 2 c-bus slave interface supports the following communication protocols: bus not busy : the sda and the scl lines remain high level when the bus is not active. start condition : start condition is sda 1 to 0 tran sition when scl=1.(see figure 3-4-2) stop condition : stop condition is sda 0 to 1 transi tion when scl=1.(see figure 3-4-2) data valid : following a start condition, th e data on the sda line must be stable during the high period of scl. the high or low state of the data line can only change when the clock signal on the scl line is low.(see figure 3-4-2) ack (acknowledge) : an ack signal indicates that a data tr ansfer is completed successfully. the transmitter (the master or the slave) releases the bus after transmitting eight bits. during the ninth clock, which the master generates, the receiver pulls the sda line low to acknowledge that it successfully received the eight bits of data. bu t the slave does not send an ack if it does not successfully received the eight bits of data. in data read operations, the slave releases the sd a line after transmitting 8 bits of data and then monitors the line for an ack signal during the nint h clock period. if an ack is detected, the slave will continue to transmit next data. if an ack is not detected, the slave terminates data transmission and waits for a stop condition to be issued by the master before returning to its stand-by mode. slave address : the identify code for the TTP229-KSF is (1010) . the device address b3 and b2 are fixed 01 , b1 can be set by the state of the a0 pin. read/write : the final (eighth) bit of th e slave address defines the type of operation to be performed. if the r/w bit is 1 , a read operation is executed. if it is 0 , a write operation is executed. but the TTP229-KSF only accepts read operation. the sequence of read data ope ration please see figure 3-4-1. table 3-4-1. slave device addressing device identifier device address r/w bit device b7 b6 b5 b4 b3 b2 b1 b0 TTP229-KSF 1 0 1 0 0 1 a0 r
preliminary TTP229-KSF tontouch tm 09?/12/22 page 9 of 18 ver : 1.0 for 8 input keys mode from master not ack from slave ack stop data_0 start slave address b0 b1 b2 b3 b4 b5 b6 b7 r a0 a1 a2 for 16 input keys mode from master not ack from master ack from slave ack start slave address data_0 data_1 stop b0 b1 b2 b3 b4 b5 b6 b7 b0 b1 b2 b3 b4 b5 b6 b7 r a0 a1 a2 note : data_0 : b7~b0 is tp0~tp7 on/off status. 0 is key off, 1 is key on. data_1 : b7~b0 is tp8~tp15 on/off status. 0 is key off, 1 is key on. figure 3-4-1. read operation sequence start condition p stop condition change data data or ack valid scl s sda figure 3-4-2. data tr ansmission sequence condition start condition stop ack data ack data ack r/w address s p 9 98 8 1 - 7 1 - 7 9 8 1 - 7 scl sda figure 3-4-3. a comple te data transfer buf t su;sto r t r t t hd;sta t su;sta t f t f t su;dat t high t hd;sta t hd;dat t low t s p sr s scl sda figure 3-4-4. defi nition of timing for f/s-mode devices on the i 2 c-bus
preliminary TTP229-KSF tontouch tm 09?/12/22 page 10 of 18 ver : 1.0 table 3-4-2. characteristics of the sda and scl bus lines for f/s-mode i 2 c-bus devices standard-mode fast-mode parameter symbol min. max. min. max. unit scl clock frequency f scl 100 400 khz low period of the scl clock t low 4.7 1.3 us high period of the scl clock t high 4.0 0.6 us hold time (repeated) start condition t hd;sta 4.0 0.6 us set-up time for a repeated start condition t su;sta 4.7 0.6 us data hold time t hd;dat 0 0 us data set-up time t su;dat 250 100 ns rise time of both sda and scl signals t r 1000 300 ns fall time of both sda and scl signals t f 300 300 ns set-up time for stop condition t su;sto 4.0 0.6 us bus free time between a stop and start condition t buf 4.7 1.3 us capacitive load for each bus line c b 400 400 pf
preliminary TTP229-KSF tontouch tm 09?/12/22 page 11 of 18 ver : 1.0 4. key operating mode the TTP229-KSF has the single-key and mu lti-key functions. these functions are set by tp3 (skms1) and tp4 (skms0) pins. the all 16 keys can use one group, or the 16 keys can distributed into two groups. the group-1 includes tp0, tp1, tp2, tp3, tp8, tp9, tp10, tp11 keys. the group-2 includes tp4, tp5, tp6, tp7, tp12, tp13, tp14, tp15 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 (skms1) tp4 (skms0) operating function 1 1 all single-keys one group(16keys) 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(16 keys) note 1. one group tp0~tp15. two groups group-1=>tp0,tp1,tp2,tp3,tp8,tp9,tp10,tp11. group-2=>tp4,tp5,tp6,tp7,tp12,tp13,tp14,tp15. 2. when uses 8 input keys mode. the using keys are tp0~tp7. 3. the option states of tp3 and tp4, the 0 state is used a high-valu e resistor connected to vss, the 1 state is not used resist or connected to vss. 4. the key detection acknowledges in single-key function, the prior ity is by the key scanning order (from tp0 to tp15) when many keys ar e touched effectively. it is not by the key touching strength. 5. wake-up sampling rate and sampling length at sleep mode the TTP229-KSF 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-KSF has two kind s 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 or 8hz=>125ms 4.0ms or 2.0ms 64hz=>15.6ms clock detect wake-up
preliminary TTP229-KSF tontouch tm 09?/12/22 page 12 of 18 ver : 1.0 6. maximum key-on time if some objects cover in the sense pad, and causi ng the change quantity enough to be detected. to prevent this, the TTP229-KSF sets a timer to monito r the detection. the timer is the maximum key-on time. it is set about 80sec at 3v. when the detect ion is over the timer, the system will return to the power-on initial state, and the output becomes inactiv e 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 maxi mum key-on time, then the key acts infinitely, this is the default. another it is set enable the maximu m key-on time that has a resistor. 7. built-in regulator the capacitive sensing touch pad ic needs stable power. so the TTP229-KSF built in regulator in the chip. it can make the internal power to keep up steady. a nd the sensitivity detect ion is normal for chip. and the stable power can avoid sensit ivity anomalies and false detections. 8. auto calibration function the TTP229-KSF includes a full auto-calibration func tion. after the device is powered-on, it will calibrate the initial condition of environment first. on the duration time all the functions are disabled, so do not operate. then the system is into stand- by mode. and all keys are not detected touch more than about 4 seconds, then the system do re-calib ration automatically. the procedure is fixed and repeated. by implementing this feature the system can catch the conditions of environment changing. and let operation of the system is normal.
preliminary TTP229-KSF tontouch tm 09?/12/22 page 13 of 18 ver : 1.0 9. the timing from sleep mode to operation mode re-calibration period period detect wake-up sleep mode time is about 4sec time is about 4sec re-calibration key scanning false trigger sleep mode detected key-out trigger finger key scanning figure 9-1. the timing for false trigger valid trigger after detected key release and do not any trigger about 8sec about 4sec about 4sec sleep mode re-calibration re-calibration detected key-out period period detect wake-up sleep mode operation mode trigger finger key scanning figure 9-2. the timing for valid trigger
preliminary TTP229-KSF tontouch tm 09?/12/22 page 14 of 18 ver : 1.0 10. option table option table option pin option states feature remark tp0 (opden) tp1 (sahl) 1 1 8 output pins => cmos output active-high 2-wires serial interface => cmos output active-low default 1 0 8 output pins => cmos output active-low 2-wires serial interface => cmos output active-high 0 1 8 output pins => od output active-low 2-wires serial interface => cmos output active-low tp0 (opden) tp1 (sahl) 0 0 8 output pins => oc output active-high 2-wires serial interface => cmos output active-high 1 8 input keys mode default tp2 (kysel) 0 16 input keys mode tp3 (skms1) tp4 (skms0) 1 1 all single-keys one group(16keys) default 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 tp3 (skms1) tp4 (skms0) 0 0 all multi-keys one group(16 keys) 1 8hz sampling rate for wake -up in sleep mode default tp5 (wpsct) 0 64hz sampling rate for wake-up in sleep mode 1 wake-up sampling length=>about 4.0ms default tp6 (slwptm) 0 wake-up sampling length=>about 2.0ms 1 maximum key-on time disable=>infinite default tp7 (sksrt) 0 maximum key-on time enable=>about 80sec note 1. about the combinations of group-1 and group-2, please see above point-4. 2. option states ?1? mean internal pull-up (default). 3. option states ?0? mean that tp0~tp7 pins are via high-value resistors connected to vss.
preliminary TTP229-KSF tontouch tm 09?/12/22 page 15 of 18 ver : 1.0 application circuit application for 16 input keys slpsena cjwa a0 tp7 vss vdd tp4 tp5 senadj1 tp6 tp2 tp3 sda ttp229-k (ssop-28) slpsenb scl tp12 tp13 senadj3 senadj0 tp1 tp0 tp15 tp14 4 3 5 6 7 8 9 10 11 12 13 14 2 1 tp11 tp10 senadj2 tp9 tp8 test 16 17 18 19 20 21 22 23 24 25 27 26 28 15 cj1 cj0 cj3 cj2 k11 k10 k9 k8 sksrt rp7 slwptm rp6 wpsct rp5 skms0 rp4 k7 k6 k5 k4 104 c1 vdd cjwb k12 k13 k14 k15 rp1 sahl rp3 skms1 kysel rp2 electrode k0 k1 k3 k2
preliminary TTP229-KSF tontouch tm 09?/12/22 page 16 of 18 ver : 1.0 application for 8 input keys slpsena cj1 cjwa cj0 a0 tp7 vss vdd tp4 tp5 senadj1 tp6 tp2 tp3 sda ttp229-k (ssop-28) slpsenb scl tp12 tp13 senadj3 senadj0 tp1 tp0 tp15 tp14 4 3 5 6 7 8 9 10 11 12 13 14 2 1 tp11 tp10 senadj2 tp9 tp8 test 16 17 18 19 20 21 22 23 24 25 27 26 28 15 tpq3 tpq2 tpq1 tpq0 tpq7 tpq6 tpq4 tpq5 opden rp0 sksrt rp7 slwptm rp6 wpsct rp5 skms0 rp4 k7 k6 k5 k4 104 c1 vdd rp1 sahl rp3 skms1 electrode k0 k1 k3 k2 ps 1. on pcb, the length of lines from t ouch pad to ic pin shorter is better. and the lines do not pa rallel and cross w ith other lines. 2. the power supply must be stable. if th e supply voltage drift or shift quickly, maybe causing sensitivity anomalies or false detections. 3. the material of panel covering on the pcb can not include the metal or the electric element. the paints on the surfaces are the same. 4. the c1 capacitor must be used between vdd and vss; and should be routed with very short tracks to the device?s vdd a nd vss pins (TTP229-KSF). 5. the capacitance cj0~cj3 and cjwa~cjwb can be used to adjust the sensitivity. the value of capacitors use smaller, then the sensitivity will be better. the sensitivity adjustment must according to the practical application on pcb. the range value of capacitors are 1pf Q cj0~cj3 Q 50pf, 1pf Q cjwa~cjwb Q 50pf. recommend to adjust the cj0~cj3 capacitor for k0~k15 first, then adjusting the cjwa and cjwb capacitor for wake-up sensitivity. 6. the sensitivity adjustment capacitors (c j0~cj3, cjwa~cjwb) must use smaller temperature coefficient and more stable capacitors. such are x7r, npo for example. so for touch application, recommend to use npo capacitor, for re ducing that the temperat ure varies to affect sensitivity. 7. recommend to use 820k ohm resistor for rp0~rp7 resistors. 8. when the system does not use the serial output interface, the scl pin must be connected to vss or vdd, it is not allowed floating.
preliminary TTP229-KSF tontouch tm 09?/12/22 page 17 of 18 ver : 1.0 package outline (28 pin ssop) package type: ssop-28 package outline dimension
preliminary TTP229-KSF tontouch tm 09?/12/22 page 18 of 18 ver : 1.0 order information a. package form: TTP229-KSF revise history 1. 2009/12/22 -original version v_1.0

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