HT45R37V -- TinyPowerTM C/R-F Type 8-Bit OTP MCU

General Description

The HT45R37V is a TinyPowerTM C/R to F Type 8-bit high performance RISC architecture microcontroller designed especially for VFD applications. As a C/R to F type of MCU, the device can interface to 9 external C or R type sensors and convert their values to a frequency value for processing. In addition its internal A/D converter allows the device to interface directly to analog signals and its integrated dual channel Pulse Width Modulators allows control of external motors, LEDs etc.

The device is specifically designed for VFD applications that interface directly to VFD panels.

With their fully integrated SPI and I2C functions, designers are provided with a means of easy communication with external peripheral hardware. The benefits of integrated A/D, C/R to F converter, and PWM functions, in addition to low power consumption, high performance, I/O flexibility and low-cost, provides the device with the versatility for a wide range of products in the home appliance and industrial application areas. Some of these products could include electronic metering, environmental monitoring, handheld instruments, electronically controlled tools, motor driving in addition to many others.

The unique Holtek TinyPower technology also gives the devices extremely low current consumption characteristics, an extremely important consideration in the present trend for low power battery powered applications. The usual Holtek MCU features such as power down and wake-up functions, oscillator options, programmable frequency divider, etc. combine to ensure user applications require a minimum of external components.

  • Operating voltage:
    fSYS=32768Hz: 2.2V~5.5V
    fSYS=4MHz: 2.2V~5.5V
    fSYS=8MHz: 3.0V~5.5V
    fSYS=12MHz: 4.5V~5.5V
  • OTP Program Memory: 4Kx15
  • RAM Data Memory: 160x8
  • 16 bidirectional I/O lines
  • Three external interrupt input shared with I/O lines
  • Two 8-bit programmable Timer/Event Counter
    with overflow interrupt and 7-stage prescaler
  • External C/R to F converter
  • 9-Channel Capacitor/Resistor sensor inputs
  • Integrated Crystal, IRC, ERC and RTC oscillator
  • Fully integrated internal RC oscillator available with
    three frequencies: 4MHz, 8MHz or 12MHz
  • Watchdog Timer function
  • LIRC or RTC oscillator function for watchdog timer
  • PFD and Buzzer for audio frequency generation
  • Dual Serial Interfaces: SPI and I2C
  • 4 operating modes: normal, slow, idle and sleep
  • 6-level subroutine nesting
  • 2-channel 12-bit resolution A/D converter
  • 1-channel 12-bit PWM output shared with I/O line
  • Low voltage reset function - 2.1V, 3.15V, 4.2V
  • Low voltage detect function - 2.2V, 3.3V, 4.4V
  • Bit manipulation instruction
  • 15-Bit table read instructions
  • 63 powerful instructions
  • Up to 0.33us instruction cycle with 12MHz system clock at VDD=5V
  • All instructions executed in one or two instruction 
    cycles
  • Idle/Sleep mode and wake-up functions to reduce
    power consumption
  • Time-Base and RTC interrupt
  • Integrated DC 24V to 5V LDO regulator
  • Buzzer and filament 5V to 24V output level shifter
  • 24-bit shift register/latch for VFD panel driving 24
    grid/segment outputs
  • Integrated 3-line serial VFD interface for grid/segment display control
  • 52-pin QFP package type

Technical Document

Other Information