Bluetooth ICs designed around wearable healthcare products - with NFC

November 18, 2015 // By Graham Prophet
Toshiba Electronics Europe has added two Bluetooth ICs with integrated Flash ROM, with one also adding the option of integrated NFC Tag functionality. The ICs have been designed for use in wearable devices, healthcare devices, smart phone accessories, sensors, remote controllers, beacons, and toys.

TC35676FTG/FSG IC and TC35675XBG support Bluetooth Low Energy (LE) version 4.1 communications, while the TC35675XBG also supports NFC Forum-compliant Type 3 Tag (FelicaTM Lite-S compatible) communications. Both devices feature integrated GATT (Generic Attribute Profile) and support servers and client functions defined by the profile.

The built-in Flash ROM eliminates the need for external EEPROM and reduces the bill of materials and PCB size. TC35676FTG/FSG uses a low-power circuit design and integrates an efficient DC-DC converter. The device integrates 192 kB Flash ROM, to store user application programs and data to enable standalone usage. The IC has a transmitter output power of 0 dBm to -20 dBm and receiver sensitivity of -92.5 dBm.

The integrated NFC Tag circuitry in the TC35675XBG enables Bluetooth pairing and simple power On/Off at the touch of an NFC supported smart device. The IC automatically generates a 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 memory as well as 2 kByte E ²PROM.

The devices achieve peak consumption of less than 6 mA (at 3.3V, -4 dBm transmitter output power or receiver operation) and consume less than 100 nA in deep sleep (at 3.3V). The NFC Tag-enabled TC35675XBG is available in a FBGA52 package measuring 4.5 by 4.5 mm with a 0.5 mm pitch, while the TC35676FTG/FSG is available in a choice of QFN40 packages measuring either 6 by 6 mm, 0.5 mm pitch (TC35676FTG), or 5 by 5 mm with a 0.4 mm pitch (TC35676FSG).