1.2. Features

 Wireless communication function

 Compliant with Bluetooth® Low Energy Ver.5.0 specification.

 Built-in Bluetooth® baseband circuit

 Built-in Bluetooth® RF circuit

 Maximum output power: +8 dBm

 Maximum RX sensitivity: -105.0 dBm (in case of Coded PHY and S = 8)

 RSSI accuracy: ±2 dB (in case of -90 to -10 dBm input)

 HCI commands/Extended HCI commands (implemented in the mask ROM)

 Control API for GATT/SM layer (TCU commands: Toshiba Command Unit) (implemented in the mask ROM)

 Auto-advertising feature

 Output power setting feature

 Microcontroller unit

 Built-in Arm® Cortex®-M0 processor (Maximum operating frequency is 32 MHz.)

 Built-in mask ROM

 Boot loader

 API for the hardware control

 Bluetooth® wireless function API

 Bluetooth® protocol stack

 Built-in retention SRAM (User area is 76 KB out of total 144 KB.)

 Interface, AD converter, and Debug function

 General-purpose I/O (GPIO) (18 pins)

 General-purpose serial interfaces

 UART interface (2 channels. Shared with the GPIO pins.)

 HCI mode: One channel is used as a host interface (9600 bps to 921.6 kbps)

 User-App mode: 600 to 2000 kbps (Maximum baudrate may be 2000 kbps or less and depends on userapplication

program.)

 SPI interface (2 channels. Shared with the GPIO pins.)

 I2C interface (2 channels. Shared with the GPIO pins.)

 TC35681 uses one channel as the interface to the EEPROM for User-App mode.

 PWM interface (4 channels. Shared with the GPIO pins.)

 Pulse generation function

 “Rhythm” function (function to mask a pulse signal)

 AD converter (ADC)

 General-purpose voltage measurement (5 channels. Shared with the GPIO pins.)

 Power supply voltage (VBAT) measurement (1 channel. Connected internally.)

 Interface for Emulator debug control

 SWD (Serial Wire Debug): 2-wire system (1 channel)

 Clock

 Reference clock (32 MHz)

 Built-in crystal oscillator with a frequency adjustment function

 Sleep clock (32.768 kHz)

 Built-in crystal oscillator with a frequency adjustment function

 External clock input is supported.

 Built-in silicon oscillator (SiOSC)

 Sleep clock output function (Shared with the GPIO pins.)

 Power supply

 Power supply circuit

 Support for wide range of the input power voltage

 DC/DC converter and LDO regulator are integrated.

 Built-in Power Management Unit for the low power consumption function.

 Independent power pins for the I/O circuits (VDDIO)

 System function

 2 system configurations are supported.

 Host-controlled system (A host CPU controls this device.)

 Standalone system (The operation of this device is controlled by its own CPU.)

 3 operating modes are supported.

 HCI mode

 Control by HCI and Extended HCI commands

 User application (firmware) programming

 For radio certification tests in different countries and regions

 For Bluetooth® qualification test

 For other RF tests

 Complete mode

 Control of this device by the TCU commands (Control commands in the GATT/SM layer)

 User-App mode

 Download function of a user application program to this device

 Download from an external EEPROM or a host CPU

 Execution of a user application program

 Low power system feature

 3 low power modes (Sleep, Backup, and Deep Sleep)

 Support for Interrupts

 Patch support

 Patch function (maximum 4)

 Auto-patch function

 DMA support

 Built-in 7-channel DMA controller (2 to 6 channels are available for a user.)

 Clock and Timer

 RTC

 RTC function with the accuracy of sleep clock frequency

 Clock and Calendar function: YY/MM/DD hh:mm:ss (24-hour clock) and day of the week

 Alarm function: Alarm setting by hh:mm and either a date or a day, and an interrupt by the alarm generation

 Leap year function (the exceptional procedure for every 100 years is not supported.)

 RTC is working even in the Sleep and Backup modes.

 Timer

 BCTimer

 3-channel hardware timer (One channel is dedicated to the system.)

 16-bit counter which can be loaded automatically every 1 μs at minimum.

 The count of the timer stops in low power mode.

 GTimer

 1-channel hardware timer

 Built-in prescaler to divide the clock (1 to 1024 division). The minimum interval is 38 ns to 39 μs.

 16-bit counter which can be loaded automatically.

 The count of the timer stops in low power mode.

 OS timer (1-second timer and 1-ms timer)

 Timer controlled by the OS

 Watchdog timer (WDT) function

 Security

 True Random Number Generator (TRNG)

 A random number of 256 bits at maximum is generated by DRBG and ESG.

 Compliant with NIST SP800-22 and BSI random number test.

 Hardware encryption engine (AES128, only encryption)

 AEC-Q100 is supported.

 Package

 QFN package [40 pins, 6 mm x 6 mm, 0.5-mm pitch, 1.0-mm thickness, and Solder-wettable pins]