基于HT46R73D-3設計的8位OTP MCU應用方案

HT46R73D-3是盛群半導體(Holtek)公司推出的雙斜率ADC 8位OTP MCU, 包含有4KB OTP 程序內存、128 B數據存儲器、2個16位計時器及1個8位計時器，另具備Buzzer硬件輸出功能。配有豐富及多樣化的外圍功能，特別適用于電橋式傳感器的量測系統，可用來量測壓力、溫度、濕度變化的產品，如：體重計、壓力計、溫度計、濕度計、胎壓計等。本文介紹了HT46R73D-3主要特性, 方框圖, 橋接傳感器輸入的雙斜率ADC連接圖和典型應用電路.

The HT46R73D-3 is an 8-bit high performance, RISC architecture microcontroller device specifically designed for A/D with LCD applications that interface directly to analog signals, such as those from sensors.

The advantages of low power consumption, I/O flexibility, timer functions, oscillator options, Dual slope A/D converter, LCD display, HALT and wake-up functions, watchdog timer, as well as low cost, enhance the versatility of these devices to suit for a wide range of AD with LCD application possibilities such as sensor signal processing, scales, consumer products, subsystem controllers, etc.

HT46R73D-3主要特性:

_ Operating voltage:

fSYS=4MHz: 2.2V~5.5V

fSYS=8MHz: 3.3V~5.5V

_ Three system oscillators:

External Crystal oscillator

External RC oscillator

Internal RC oscillator

_ Up to 16 bidirectional I/O lines

_ One external interrupt input shard with an I/O lines

_ One 8-bit and two 16-bit programmable timer/event counter with overflow interrupt a 8-stage pre-scalar

_ LCD driver with 16_4 segments

_ 4K_15 program memory

_ 128_8 data memory RAM

_ Single differential input channel dual slope Analog to Digital Converter with Operational Amplifier.

_ Watchdog Timer with regulator power

_ Buzzer output

_ Internal 12kHz RC oscillator

_ External 32.768kHz Crystal oscillator

_ HALT function and wake-up feature reduce power consumption

_ Voltage regulator (3.3V) and charge pump

_ Embeded voltage reference generator (1.5V)

_ 4-level subroutine nesting

_ Bit manipulation instruction

_ 15-bit table read instruction

_ Up to 0.5_s instruction cycle with 8MHz system clock at VDD=5V

_ 63 powerful instructions

_ All instructions in 1 or 2 machine cycles

_ Low voltage reset function

_ One vibration sensor input

_ Four touch-key inputs

_ 52-pin QFP package

圖1.HT46R73D-3方框圖


圖2.HT46R73D-3輸入/輸出端口框圖


圖3.HT46R73D-3橋接傳感器輸入的雙斜率ADC連接圖

圖4.HT46R73D-3應用電路圖