Communications USB to RS-232 chipset

Communications USB to RS-232 chipset

FTDI has introduced a chipset for USB to RS-232 interfacing.

Called USB-DUO, it combines the company’s FT231XS USB-to-UART chip with its FT3243S RS-232 transceiver.

The transceiver runs from a single 3-5.5V rail, using internal regulated charge pumps to feed the drivers, and has a built-in transient voltage suppressor (complying with EN6100-4-2′s +/-15kV for air gap discharge). “This means that additional electro-static discharge protection circuitry is not called for,” said FTDI.

Speeds up to 250kbit/s are available, and the FT231XS’s internal EEPROM allows device descriptors to be set to an OEM’s preference.

An internal phased-locked-loop (PLL) provides system timing.

Current consumption is 9mA active, and 135µA when the FT231XS is in suspend mode.

Its -40 to 85°C operation range makes it suitable for industrial use.

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