Shenzhen Jinhanyu Electronics Co., Ltd
CT8229
8/16 Key Capacitive Touch Detection Chip
Overview
Description
The CT8229 touch detection IC is a touch chip designed using capacitive sensing principles. This chip features a built-in voltage regulator for the touch sensor, providing stable touch performance applicable in various scenarios. The human touch panel can be connected through non-conductive insulating materials, primarily used to replace mechanical switches or buttons. This chip can independently support 8 or 16 touch keys.
PART 01.
Performance Features
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Operating Voltage
2.5V~5.5V (with internal voltage regulator enabled)
2.0V~5.5V (with internal voltage regulator disabled)
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Built-in voltage regulator function
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Standby Current (3V voltage, low-speed sampling rate of 8Hz in sleep mode)
=> In 16-key mode, typical value 5.0uA
=> In 8-key mode, typical value 4.5uA
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External option to select 16-key or 8-key mode
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Provides 8 direct output independent ports, limited to 8-key direct output mode
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Features I2C communication output, applicable in 16-key/8-key mode
CT8229 slave device identifier and address => [1010 111R]
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8 direct output ports can select different output types (CMOS/OD/OC with high/low level active)
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Options for maximum output time for valid keys is approximately 80 seconds
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Sensitivity can be adjusted by external capacitance (1~50pF)
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Requires 0.5 seconds stabilization time after power-up
During this period, please do not touch the key panel; all touch functions are inactive
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Automatic Calibration
When no keys are touched for a period, the chip system recalibrates in approximately 4.0 seconds
PART 02.
Important Diagram References
Typical Application Circuit Diagram
Functional Modules
Package and Pin Definitions
Note: The above are three different package pin definitions.
CT8229-LSF is an 8-channel input with 8 IO output/16-channel input IC bus output, with interrupt signal SDO output; CT8229-KSF is an 8-channel input with 8 IO output/16-channel input I2C bus output, allowing two ICs to be mounted on the bus simultaneously; CT8229-MOB is an 8-channel input with 2-wire serial (SPI) output.
Note: Pin Types
I => CMOS Input I-PH => CMOS Input with Pull-up Resistor I-PL => CMOS Input with Pull-down Resistor
O => CMOS Output I/O => CMOS Input/Output P => Power/Ground OD => CMOS Open Drain Output;
(Under OD output, the open-drain outputs of pins TPQ0~TPQ7 have diode protection circuits, while the SDA pin does not)
PART 03.
Electrical Characteristics
Absolute Maximum Ratings
Electrical Parameters
PART 04.
Agency Authorization
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