Proving the Business Case for the Internet of Things

Toshiba Bluetooth ICs target wearables and healthcare devices

Steve Rogerson
November 18, 2015
Toshiba Electronics is introducing two Bluetooth ICs for use in wearable devices, healthcare devices, smart phone accessories, sensors, remote controllers, beacons and toys.
The Japanese company’s chips have built-in flash ROM, and one also has the option of integrated NFC tag functionality.
Both the TC35676FTG/FSG IC and TC35675XBG support Bluetooth Low Energy version 4.1 communications, while the TC35675XBG also supports NFC Forum-compliant type three tag (Felica Lite-S compatible)communications. Both devices feature integrated GATT generic attribute profile and support servers and client functions defined by the profile.
The number of Bluetooth Smart devices offering Bluetooth LE compatibility is growing rapidly and these ICs are intended to simplify their design. Both devices will help designers achieve lower cost designs as the built-in flash ROM eliminates the need for external EEPROM and reduces the bill of materials and PCB size. In turn, this will facilitate the adoption of Bluetooth LE communications for small devices, such as wearable healthcare devices, sensors, beacons and toys.
They have a low-power circuit design and integrate an efficient DC-DC converter. The device integrates 192kbyte flash ROM to store user application programmes and data to enable standalone usage. The IC has a transmitter output power of 0 to -20dBm and receiver sensitivity of -92.5dBm.
In addition to the functionality provided by the devices, the integrated NFC tag circuitry enables Bluetooth pairing and simple power on-off at the touch of an NFC supported smart device. The IC automatically generates cyclic redundancy code (CRC) during writing to the tag chip and provides automatic checks during data reads from the tag chip. The TC35675XBG also adds additional SRAM as well as 2kbyte E2PROM.
The low power architecture of the ICs ensures they can operate for long time periods powered only by small coin cell batteries. The devices achieve peak consumption of less than 6mA at 3.3V, -4dBm transmitter output power or receiver operation, and consume less than 100nA in deep sleep at 3.3V.
The NFC tag-enabled TC35675XBG is available in a FBGA52 package measuring 4.5 by 4.5mm with a 0.5mm pitch, while the TC35676FTG/FSG is available in a choice of QFN40 packages measuring either 6 by 6mm, 0.5mm pitch (TC35676FTG), or 5 by 5mm with a 0.4mm pitch (TC35676FSG).