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Keywords：BS45F3232、BS45F3340、BS45F3345、BS45F3346

The release of the new BS45F3340/BS45F3345/BS45F3346 devices adds three new additions to Holtek’s proximity sensor product series. As the updated products are based on the BS45F3232, the devices also include a fully integrated active IR proximity sensing circuit. In addition to increasing the program memory and data memory capacity, functions including touch keys, a UART communication interface and an internal temperature sensor have also been added. The UART communication interface includes control options for an external smart BLE/WIFI module. This set of powerful functions make the devices suitable for use in most proximity sensing related products, such as sanitary products, bathroom products, home appliances, security products, etc.

The BS45F334x series of devices includes an integrated active IR proximity sensor circuit which greatly reduces the number of usually required external components, such as operational amplifier, D/A converter, transistors, resistors and capacitors, thus reducing production BOM costs and PCB size. The devices’ transmitting power and receiving sensitivity can also be controlled using the application program. By using the integrated EEPROM, application options, auto adjustments and calibration parameter can be easily stored. Regarding the system resources, the devices include 4 touch keys, a Flash Program Memory capacity of 4K×16, a Data Memory capacity of 192×8, an EEPROM Memory capacity of 32×8, a UART communication interface, a 12-bit A/D converter with an internal V_REF reference voltage and a temperature sensor, as well as a range of other functions. The BS45F3345/46 devices also provide an internal H-bridge function for driving motors or solenoid valves and other components.

The BS45F3340 is supplied in 16-pin QFN (4×4×0.75mm), 16-pin NSOP and 24-pin SSOP package. The BS45F3345/46 are supplied in 16-pin NSOP and 24/28-pin SSOP package.