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I/O expander adds more ports for handsets

Posted: 07 Apr 2008 ?? ?Print Version ?Bookmark and Share

Keywords:flexible I/O expander? mobile handsets? LED?


Toshiba America Electronic Components Inc. (TAEC) has expanded its mobile peripheral device portfolio with the introduction of the TC35892XBG flexible I/O expander. The device provides additional I/O ports, allowing devices such as keypads, LEDs and rotator wheels to interface with a mobile handset or other portable consumer electronics device's baseband and/or application processor.

The TC35892XBG addresses the mechanical and electrical design challenges associated with moveable parts in today's handheld consumer electronic products. Some of these issues include hinges and sliders used in these designs that can cause EMI and mechanical stress in handheld products, said Toshiba.

The TC35892XBG addresses these challenges by reducing the wired connections in these designs while still providing full flexibility to handle various keypad layouts from 2 x 2 to 8 x 12 with up to 96 keys and eight special function keys.

The low-pin-count TC35892XBG offers up to 24 configurable general-purpose I/O ports at needed locations. It offers built-in functionality for managing a keypad, PWM signal generation for LED and vibrator control and a rotator wheel interface. The devices' small packaging, 3.5mm x 3.5mm x 1.2mm, and an internal clock generator make it well suited for space-constrained handhelds.

The TC35892XBG offers a 1.7-2.7V power supply range. Low-power features include operation from a low frequency clock source of 32kHz, and clock-less operation is possible with most features to allow peripherals connected to the TC35892XBG to operate independently of the application processor for increased battery life. The TC35892XBG also offers additional glue logic for general-purpose use.

Pricing starts at $5.50 per unit in quantities of 10,000. The devices are available now.

- Gina Roos

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