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Toshiba ICs reduce current consumption for IoT devices

Steve Rogerson
July 21, 2016



Three ICs from Toshiba Electronics support Bluetooth Low Energy (BLE) version 4.1 communications for use in wearable technology, medical equipment, smartphone accessories, remote controls and a wide variety of emerging IoT products.
 
The TC35678FSG, TC35678FXG and TC35679FSG use an efficient DC-DC converter and a low-power circuit design to reduce current consumption by nearly 46 per cent compared to previous products, such as the TC35667FTG. At a 3V voltage supply, the ICs achieve peak current consumption of 3.6mA in transmitting mode and 3.3mA in receiver mode. In deep sleep mode, this is reduced to 100nA.
 
Both the TC35678FXG and TC35678FSG incorporate 256kbyte of built-in flash ROM to store user programmes and data in stand-alone operations without a need for an external host MCU. Dedicated memory capacity for user programmes is now extended from 64kbyte in previous products to 100kbyte in both ICs, contributing to greater expansion options for application programmes.
 
This built-in flash ROM eliminates any need for external EEPROM and contributes to reductions in both cost and mounting-area, by reducing the number of external parts.
 
The Japanese company’s TC35678FXG is a repackaged version of the TC35678FSG, in a QFN60 package that extends the number of general purpose IO from 16 to 32. It is suitable for use in equipment such as keyboards and remote controls that require a large number of control pins.
 
In comparison, the TC35679FSG has no built-in flash ROM and can consequently achieve even lower current operation. It achieves long operating times for applications powered by small coin batteries. For example, using a CR2032 type coin battery, the IC can carry out beacon operation for over a year, calculated with a 220mAh battery and two-second beacon interval time.