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New Proximity Sensing 2-Key Touch MCUs

16/11/2021

The release of the new BS45F3332/BS45F3335/BS45F3336/BS45F3337 devices adds four new additions to Holtek’s proximity sensor product series.
For IR proximity sensing applications, these new devices integrate functions including a fully integrated active IR proximity sensing circuit, a receiving circuit and touch keys. These devices all have a high level of functional integration which greatly reduces the required number of external components, such as operational amplifier, D/A converter, transistors, resistors and capacitors, thus reducing the product PCB size and costs.
This set of powerful functions allows the devices to meet the requirements of most proximity sensing related products. The devices are very suitable for use in short/medium range detection applications, such as automatic soap dispensers, sensing alcohol sprayers, and sensing trashcans.

Main Features

CPU Features:

  • Operating Voltage
    - fSYS=8MHz: 1.8V~5.5V
  • Up to 0.5μs instruction cycle with 8MHz system clock at VDD=5V
  • Power down and wake-up functions to reduce power consumption
  • Oscillator type
    - Internal High Speed 8MHz RC – HIRC
    - Internal Low Speed 32kHz RC – LIRC
  • Multi-mode operation: FAST, SLOW, IDLE and SLEEP
  • Fully integrated internal oscillators require no external components
  • All instructions executed in one or two instruction cycles
  • Table read instructions
  • 61 powerful instructions
  • 4-level subroutine nesting
  • Bit manipulation instruction


Peripheral Features:

  • Flash Program Memory: 2K×15
  • RAM Data Memory: 128×8
  • True EEPROM Memory: 32×8
  • 2 touch key functions – fully integrated without requiring external components
  • Watchdog Timer function
  • Up to 13 bidirectional I/O lines
  • Single external interrupt line shared with I/O pin
  • Timer Module for time measure, compare match output and PWM output function
  • Dual Time-Base functions for generation of fixed time interrupt signals
  • 4 external channel 10-bit resolution A/D converter with programmable internal reference voltage VVR
  • 2-channel sink current generator provides an infrared LED constant current driving of up to 320mA
  • Proximity Sensing Circuit
    - One Operational Amplifier
  • Low Voltage Reset function
  • Package types: 8-pin SOP, 16-pin NSOP
Documents Tech question
Holtek BS45 F3332 proximity sensing mcu

New Proximity Sensing 2-Key Touch MCUs

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Holtek

Holtek Semiconductor is a leading professional IC design house in Taiwan having its major business activities focused in the area of microcontroller and peripheral component design.

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Documents

  • Holtek BS45 F3337v100 Datasheet
  • Holtek BS45 F3336v100 Datasheet
  • Holtek BS45 F3335v100 Datasheet
  • Holtek BS45 F3332v100 Datasheet
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