CT8224 Datasheet | CHINAIC

CHINAIC SEMICONDUCTOR CORP., LTD. CT8224 4 Key touch detection IC new version update time Update Explanation V1.3 2015-6-18 Important modify the application circuit (option feet vacant issue) V1.4 2015-8-31 Modify the three key resistance incorrect application problems description 4 Key touch detection IC 4 Key touch detection IC .csc-ic. 2015-9-11 V1.4 I. Overview CT8224 It is a design principle using capacitive sensing touch IC , Its stable induction may be applied to various electronic Product, the panel can be fully insulated dielectric material, designed to replace conventional mechanical switches or a mon key structure design. provide 4 Touch input pins and 4 Direct output pins. Second, characteristics Operating Voltage: 2.4V ~ 5.5V It can be externally Option Select whether to enable the internal regulator circuit function Working current@ VDD = 3V When no-load, low-power mode is typically less than the value of 4.0u A @ VDD = 3V When, in the fast mode, the fastest response time of the touch key 60m S , Low power mode 160m S Each touch sensitive keys degree It may be adjusted by an external capacitor ( 0 ~ 50p F) provide LPMB Pin select fast mode or low-power mode Direct output mode, trigger mode, open-drain output, CMOS Active-high or active-low output, via TOG / AHLB / OD Select Pin No protection diodes provide two output pins TPQ0D , TPQ2D It is limited to active low provide MOT1, MOT0 Pin select the maximum output time: 120Sec / 64 Sec / 16 Sec / gigantic After power is about 0.5 Sec The system settling time, during this period do not touch Touch PAD And Touch does not work Automatic calibration, when no key is touched, the system re-calibration cycle is about 4.0 Sec .csc-ic. 2015-9-11 V1.4 Third, a functional block diagram Fourth, the package and Pin Description SSOP16 8224S-4 (4KEY) SOP16 8224-4 (4KEY) SOP8 8224-2 (2KEY) SOP8 8224-3 (3KEY) .csc-ic. 2015-9-11 V1.4 No....