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MCZ33972A

Freescale Semiconductor
Part Number MCZ33972A
Manufacturer Freescale Semiconductor
Description Multiple Switch Detection Interface
Published Jun 12, 2007
Detailed Description Freescale Semiconductor Advance Information Document Number: MC33972 Rev. 9.0, 4/2007 Multiple Switch Detection Interf...
Datasheet PDF File MCZ33972A PDF File

MCZ33972A
MCZ33972A

Overview
Freescale Semiconductor Advance Information Document Number: MC33972 Rev.
9.
0, 4/2007 Multiple Switch Detection Interface with Suppressed Wake-Up The 33972 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).
The device also features a 22-to-1 analog multiplexer for reading inputs as analog.
The analog input signal is buffered and provided on the AMUX output pin for the MCU to read.
The 33972 device has two modes of operation, Normal and Sleep.
Normal mode allows programming of the device and supplies switch contacts with pullup or pulldown current as it monitors switch change of state.
The Sleep mode provides low quiescent current, which makes the 33972 ideal for automotive and industrial products requiring low sleep state currents.
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