HT46R73D-3是盛群半导体（Holtek）公司推出的双斜率ADC 8位OTP MCU, 包含有4KB OTP 程序内存、128 B数据存储器、2个16位计时器及1个8位计时器，另具备Buzzer硬件输出功能。配有丰富及多样化的外围功能，特别适用于电桥式传感器的量测系统，可用来量测压力、温度、湿度变化的产品，如：体重计、压力计、温度计、湿度计、胎压计等。本文介绍了HT46R73D-3主要特性， 方框图， 桥接传感器输入的双斜率ADC连接图和典型应用电路。
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
图1.HT46R73D-3方框图
图2.HT46R73D-3输入/输出端口框图
图3.HT46R73D-3桥接传感器输入的双斜率ADC连接图
图4.HT46R73D-3应用电路图
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