HT45R35V -- C/R to F Type 8-Bit OTP MCU (Restricted Products)

General Description

The HT45R35V is a C/R to F Type with 8-bit high performance RISC architecture microcontroller designed especially for VFD applications.

The usual Holtek MCU features such as power down and wake-up functions, oscillator options, etc. combine to ensure user applications require a minimum of external components.

The device is specifically designed for VFD applications that interface directly to VFD panels. The benefits of integrated C/R to F functions, in addition to low power consumption, high performance, I/O flexibility and low-cost, enhance the versatility of these devices to suit a wide range of VFD application possibilities such as household appliance timers, various consumer products, subsystem controllers, other home appliances etc.

  • Operating voltage:
    fSYS=4MHz: 2.2V~5.5V
    fSYS=8MHz: 3.3V~5.5V
  • 16 bidirectional I/O lines
  • Two external interrupt inputs shared with I/O lines
  • 8-bit programmable timer/event counter with
    overflow interrupt and 7-stage prescaler
  • External RC oscillation converter
  • On-chip crystal and RC oscillator
  • Watchdog Timer
  • 12 capacitor/resistor sensor input
  • 2048x14 program memory
  • 120x8 data memory RAM
  • Power Down and Wake-up function reduce power
    consumption
  • Up to 0.5us instruction cycle with 8MHz system clock at VDD=5V
  • All instructions executed in one or two machine cycles
  • 14-bit table read instruction
  • Four-level subroutine nesting
  • Bit manipulation instruction
  • 63 powerful instructions
  • Low voltage reset function
  • 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