TI Releases Passive Low Frequency Interface with Battery Charge Function

(Product News, 13 Nov 2009)

Texas Instruments Inc. (TI) has announced the first member of a new product class featuring the industry's first passive low frequency interface (PaLFI) device designed to wirelessly supply an ultra-low-power MSP430 microcontroller (MCU) with energy to operate even if the optional battery is empty. For example, PaLFI has the ability to remotely communicate with and power implantable medical devices, making procedures less invasive. Among numerous other potential applications, the device is also being used for production chain or container tracking and end of line configuration of electronic equipment such as CD/DVD players and measurement instruments.

The PaLFI device combines a low frequency wireless interface with an SPI interface which ensures ultra-stable communication within a very well defined activation/communication zone. Upcoming product class releases include derivatives with security/authentication features and cost-optimized versions with smaller memory minus the battery charge function for applications such as end of line product configuration.

Key features and benefits of the PaLFI include:
• Battery check and charge function via RF field supports operation of hermetically sealed devices such as implants.
• PaLFI memory is accessible via an SPI and wireless LF 134kHz interface allowing for access to additional microcontroller memory.
• The device can supply a battery powered MSP430 MCU with energy and operate the microcontroller even if the battery is empty ensuring data is still available and not getting lost.
• Low Frequency band (LF) ensures stable communication within a well defined reading zone.
• No battery required for data programming into the memory to allow an MCU to read content and use it for configuration, or calibration purposes once connected to the battery.