The BS66F340C / BS66F350C / BS66F360C series is a high-performance 8-bit Flash microcontroller family designed for modern capacitive touch applications. Featuring built-in touch key capability, advanced A/D conversion, and robust system protection, this series is ideal for home appliances, instruments, and consumer electronics.

CPU Features

• Operating Voltage Range:

• fSYS = 4MHz: 2.2V ~ 5.5V

• fSYS = 8MHz: 2.2V ~ 5.5V

• fSYS = 12MHz: 2.7V ~ 5.5V

• fSYS = 16MHz: 3.3V ~ 5.5V

• High-Speed Operation:

• Instruction cycle as fast as 0.25μs at 16MHz system clock with VDD = 5V

• Power Efficiency:

• Power-down and wake-up modes for reduced power consumption

• Multi-mode operation: FAST, SLOW, IDLE, and SLEEP

• Flexible Oscillator Options:

• External High-Speed Crystal (HXT)

• Internal High-Speed RC Oscillators: 8MHz, 12MHz, 16MHz (HIRC)

• Internal Low-Speed 32kHz RC (LIRC)

• External 32.768kHz Crystal (LXT)

• Fully integrated internal oscillators — no external components required

• Efficient Instruction Set:

• All instructions execute in 1–3 cycles

• 115 powerful instructions

• Support for table read operations

• Up to 12-level subroutine nesting

• Bit manipulation instructions

Peripheral Features

• Memory:

• Flash Program Memory: 4K×16 to 16K×16

• RAM: 512×8 to 1024×8

• True EEPROM: 128×8

• In-Application Programming (IAP) supported

• System Protection:

• Watchdog Timer (WDT)

• Low Voltage Reset (LVR)

• Low Voltage Detection (LVD)

• I/O Capability:

• Up to 46 bidirectional I/O lines

• Programmable current source/sink for LED drive applications

• Two external interrupt lines (shared with I/O pins)

• Timers & PWM:

• Time measurement

• Input capture

• Compare match output

• PWM and single pulse generation

• Multiple timer modules supporting:

• Dual Time-Base support for fixed-interval interrupt signals

• Analog Features:

• 8-channel 12-bit A/D converter

• Internal reference voltage (VBG)

• Touch Key Integration:

• Supports up to 28 fully integrated capacitive touch keys

• No external components required for touch sensing

• Communication Interfaces:

• Serial Interface Module (SIM) for SPI or I2C

• UART: Full-duplex asynchronous communication

• Package Types:

• 28-pin SSOP

• 44-pin and 48-pin LQFP

Application Scenarios

Thanks to its high integration and reliability, this series is ideal for:

• Smart Remote Controllers

• Household Appliances (e.g., rice cookers, water kettles, coffee machines)

• Measurement Instruments and Digital Panels

• Smart Plugs and Small Home Automation Devices

• Consumer Electronics with Capacitive Key Interfaces

Why Choose AXTEK

AXTEK is a trusted solution partner of Holtek, specializing in tailored application solutions based on Holtek MCU platforms. With over 10 years of experience in embedded system development and more than 10,000 successful cases, AXTEK delivers professional, reliable, and efficient design services that help customers accelerate product development and market entry.