BH67F2485

AC Impedance and Electrochemical Measurement Flash MCU

General Information

The BH67F2485 is a Flash Memory A/D type 8-bit high performance RISC architecture microcontroller, specifically designed for HCT Glucose Meter with LCD display applications.

For memory features, the Flash Memory offers users the convenience of multi-programming 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. By using the In Application Programming technology, users have a convenient means to directly store their measured data in the Flash Program Memory as well as having the ability to easily update their application programs.

Multiple and extremely flexible Timer Modules provide timing, pulse generation and PWM generation functions. Communication with the outside world is catered for by including fully integrated SPI, I2C and UART interface functions, some 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 external, internal and high and low oscillator functions are provided including two fully integrated system oscillators which require no external components for their implementation. The ability to operate and switch dynamically between a range of operating modes using different clock sources gives users the ability to optimise microcontroller operation and minimise power consumption.

With regard to Glucose Meter applications, the device has integrated many functions required by these products. These include functions such as Internal LDO, Internal Reference Voltage generator, 12-bit D/A Converter, 24-bit Delta Sigma A/D converter, operational amplifers, bio-impedence measurement function, Over Voltage Protection, Multiplication/Division Unit, LCD driver function etc. The inclusion of flexible I/O programming features, Time-Base functions along with many other features ensure that the device will be highly capable of providing MCU solutions for HCT Glucose Meter applications which include an LCD display.

 

CPU Features

Operating Voltage
  • fSYS = 4MHz: 2.2V~5.5V
  • fSYS = 8MHz:  2.2V~5.5V
  • fSYS = 12MHz: 2.7V~5.5V
  • fSYS = 16MHz: 3.3V~5.5V
Up to 0.25us instruction cycle with 16MHz system clock at VDD = 5VAvailable
Power down and wake-up functions to reduce power consumptionAvailable
Oscillator types
  • - External High Speed Crystal – HXT
  • - External Low Speed 32.768kHz Crystal – LXT
  • - Internal High Speed 4/8/12MHz RC – HIRC
  • - Internal Low Speed 32kHz RC – LIRC
Fully integrated internal oscillators require no external componentsAvailable
Multi-mode operation

FAST, SLOW, IDLE and SLEEP

All instructions executed in 1~3 instruction cyclesAvailable
Table read instructionsAvailable
115 powerful instructionsAvailable
12-level subroutine nestingAvailable
Bit manipulation instructionAvailable

Peripheral Features

Flash Program Memory

48K×16

RAM Data Memory

4096×8

True EEPROM Memory

128×8

Watchdog Timer functionAvailable
In Application Programming – IAPAvailable
44 bidirectional I/O linesAvailable
Programmable I/O port source current for LED applicationsAvailable
6 pin-shared external interruptsAvailable
Multiple Timer Modules for time measure, input capture, compare match output, PWM output or single pulse output function
  • - 1 Standard type 16-bit Timer Module – STM
  • - 3 Periodic type 10-bit Timer Modules – PTM0~PTM2
Dual Time-Base functions for generation of fixed time interrupt signalsAvailable
Glucose Meter HCT AFE
  • - Internal LDO
  • - Internal Reference Voltage Generator
  • - Two 12-bit D/A Converters
  • - 2 internal Operational Amplifiers
  • - 6 external channel 24-bit resolution A/D Converter
  • - Bio-impedance Measurement Function
Over Voltage Protection function with interruptAvailable
Serial Interface Module includes SPI and I2C interfacesAvailable
Single Serial Peripheral Interface – SPIAvailable
Dual fully-duplex Universal Asynchronous Receiver and Transmitter Interfaces – UART0 and UART1Available
16-bit Multiplication Division Unit – MDUAvailable
LCD Driver function
  • - SEGs × COMs: 36×4, 34×6 or 32×8
  • - Duty type: 1/4 duty, 1/6 duty or 1/8 duty
  • - Bias level: 1/3 bias or 1/4 bias
  • - Bias type: R type or C type
  • - Waveform type: type A or type B
Low Voltage Reset functionAvailable
Low Voltage Detect functionAvailable
Package types

64/80-pin LQFP

Resources

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