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MC33975 Datasheet Multiple Switch Detection Interface

Manufacturer: Freescale Semiconductor (now NXP Semiconductors)

Overview: www.DataSheet4U.com Freescale Semiconductor Technical Data Document order number: MC33975 Rev 4.0, 08/2005 Multiple Switch Detection Interface with Suppressed Wake-Up and 32mA Wetting Current Freescale offers multiple Switch Detection Interface Devices. The 33975 Multiple Switch Detection Interface with Suppressed Wake-Up is designed to detect the closing and opening of up to 22 switch contacts. The switch status, either open or closed, is transferred to the microprocessor unit (MCU) through a serial peripheral interface (SPI).

Key Features

  • a 22-to-1 analog multiplexer for reading inputs as analog. The 33975 device has two modes of operation, Normal and Sleep. Normal mode allows programming of the device and supplies switch contacts with pull-up or pull-down current as it monitors switch change of state. The Sleep mode provides low quiescent current, which makes the 33975 ideal for automotive and industrial products requiring low sleep state currents. Improvements are a programmable interrupt timer for Sleep mode that can be disabl.

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