Application of HT45R38 touch button in programmable power supply

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description:

With the in-depth development of electronic technology, more and more intelligent instruments are being used, and the fields involved are becoming wider and wider, and the requirements for power supplies of instruments are getting higher and higher. Nowadays, the power supply equipment has a trend toward digitalization, and the application of HOLTEK HT45R38 has certain advantages in this respect. Its characteristics are as follows:

• Supports up to 29 I/Os
• 5-channel precision 12-bit A/D converter
• An operational amplifier
• 2-channel PWM output and I/O Port sharing. When the system frequency is 8MHz, the PWM frequency can reach 125kHz.
• 12-channel capacitive/resistive sensor input

HT45R38 basic features

• Operating voltage: fSYS=4MHz: 2.2V~5.5V fSYS=8MHz: 3.3V~5.5V
• 29 bidirectional input/output ports
• 2 external interrupt inputs that share pins with input/output ports
• 8-bit programmable timer/counter with overflow interrupt and 7-stage prescaler
• 5-channel 12-bit resolution A/D converter
• 2-channel 8-bit PWM output shared with 2 input/output ports
• An operational amplifier
• External RC oscillation conversion circuit
• Built-in crystal and RC oscillator circuit
• Watchdog timer
• 12-channel capacitive/resistive sensor input
• 4096×15 program memory ROM
• 192×8 data memory RAM

Some application circuits are shown in the attached file. More circuit examples and detailed descriptions can be found in the PDF document.