Bluetooth ICs use Flash ROM to reduce healthcare BoM

Two Bluetooth ICs with built-in Flash ROM, one with the option of integrated NFC Tag functionality, have been announced by Toshiba. The TC35676FTG/FSG IC and TC35675XBG have been designed for use in wearable devices, healthcare devices, smart phone accessories, sensors, remote controllers, beacons, and toys.

Both support Bluetooth Low Energy version 4.1 communications. The TC35675XBG also supports NFC Forum-compliant Type 3 Tag (Felica Lite-S compatible) communications. Both have integrated GATT (Generic Attribute Profile) and support servers and client functions defined by the profile.

They should help designers achieve lower cost designs, says the company, as the built-in Flash ROM eliminates the need for external EEPROM and reduces the bill of materials and PCB size, for size- and cost-sensitive wearable healthcare devices, sensors, beacons, and toys.

The TC35676FTG/FSG uses a low-power circuit design and integrates an efficient DC/DC converter, together with 192kbyte Flash ROM, to store user application programs and data to enable standalone usage. The IC has a transmitter output power of 0 to -20dBm and receiver sensitivity of -92.5dBm.

The same functionality is by the TC35675XBG, which also has integrated NFC Tag circuitry to enable Bluetooth pairing and simple power on/off at the touch of an NFC- supported smart device. The IC automatically generates cyclic redundancy code 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 2kB E2PROM.

The low power architecture of both ICs ensures they can operate for long time periods powered only by small coin cell batteries. Peak consumption is less than 6mA at3.3V, -4dBm transmitter output power or receiver operation. They consume less than 100nA in deep sleep at 3.3V.

The NFC Tag-enabled TC35675XBG is available in a FBGA52 package measuring 4.5 x 4.5mm with a 0.5mm pitch. The TC35676FTG/FSG is available in a choice of QFN40 packages measuring either 6.0 x 6mm, 0.5mm pitch (TC35676FTG), or 5.0 x 5mm with a 0.4mm pitch (TC35676FSG).

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