The HT45F23A and HT45F24A are Flash Memory Tinypower A/D type 8-bit high performance RISC architecture microcontrollers, designed especially for applications that interface directly to analog signals. The devices have higher gain bandwidth making them more suitable for higher frequency applications.

Offering users the convenience of Flash Memory multi-programming features, the devices also include wide range of functions and features. Other memory includes an area of RAM Data Memory as well as an area of true EEPROM memory for storage of non-volatile data such as serial numbers, calibration data etc.

Analog features include an integrated multi-channel Analog to Digital Converter, dual Pulse Width Modulation outputs, dual Operational Amplifiers, dual Comparators, one internal 2.4V or 3.3V LDO (Low Drop Out) for voltage regulator and a 12-bit DAC for voice output application, communication with the outside world is catered for by including fully integrated SPI or I2C interface functions, two popular interfaces which provide designers with a means of easy communication with external peripheral hardware. Protective features such as an internal Watchdog Timer, Low Voltage Reset and Low Voltage Detector coupled with excellent noise immunity and ESD protection ensure that reliable operation is maintained in hostile electrical environments.

A full choice of internal, external, low and high speed oscillator functions are provided including fully integrated system oscillators which require no external components for their implementation. 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.

The inclusion of flexible I/O programming features, Time-Base functions along with many other features ensure that the devices will find excellent use in applications such as smoke detectors, electronic metering, environmental monitoring, handheld instruments, household appliances, electronically controlled tools, motor driving, home security systems and many others.

CPU Features

• Operating voltage
  • fSYS = 32.768kHz: 2.2V~5.5V
  • fSYS = 910kHz: 2.2V~5.5V
  • fSYS = 2MHz: 2.2V~5.5V
  • fSYS = 4MHz: 2.2V~5.5V
  • fSYS = 8MHz: 3.3V~5.5V
• TinyPower technology for low power operation
• Power down and wake-up functions to reduce power consumption
• Oscillator types
  • External Crystal -- HXT
  • External 32.768kHz Crystal -- LXT
  • External RC -- ERC
  • Internal RC -- HIRC
  • Internal 32kHz RC -- LIRC
  • External Clock -- EC
• Multi-mode operation: Normal, Slow, Idle and Sleep
• Fully integrated internal 32kHz, 910kHz, 2MHz, 4MHz and 8MHz oscillator requires no external components
• Externally supplied system clock option
• All instructions executed in one or two machine cycles
• Table read instructions
• 61 or 63 powerful instructions
• 6-level subroutine nesting
• Bit manipulation instruction

Peripheral Features

• Flash Program Memory: 2Kx15~4Kx16
• RAM Data Memory: 128x8~192x8
• True EEPROM Data Memory: 64x8
• Up to 26 bidirectional I/O lines
• Watchdog Timer function
• Software controlled 4-SCOM lines LCD COM driver with 1/2 bias
• Multiple pin-shared external interrupts
• Single 8-bit programmable Timer/Event Counter with overflow interrupt and Single 16-bit programmable Timer/Event Counter with overflow interrupt function
• Dual Time-Base functions
• Serial Interfaces Module - SIM for SPI or I2C
• Dual Comparator functions
• Dual Operational Amplifiers functions
• Operational Amplifier output to internal two channel 12-bit ADC function
• Multi-channel 12-bit ADC
• Up to 2 channel 8-bit PWM
• 12-bit Audio DAC output
• PFD/Buzzer for audio frequency generation
• Internal 2.4V/3.3V LDO
• Low voltage reset function
• Low voltage detect function
• 16-pin NSOP, 20/24/28-pin SSOP package types

Specification:

• internal clock: 910kHz, 2MHz, 4MHz, 8MHz
• VDD: 2.2V~5.5V
• system clock: 400kHz~8MHz or 32kHz
• program memory: 2Kx15
• data memory: 128x8
• data EEPROM: 64x8
• stack: 6
• I/O: 22
• timer: 8-bit×1, 16-bit×1
• ADC: 12-bit×6
• DAC: 12-bit×1
• PWM: 8-bit×2
• comparator: 2
• interface: SPI/I²C×1
• case: 20SSOP