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MC34972

Part Number	MC34972
Manufacturer	NXP
Description	Multiple Switch Detection Interface
Published	Jul 14, 2020
Detailed Description	Freescale Semiconductor Technical Data Document Number: MC34972 Rev. 1.0, 9/2013 Multiple Switch Detection Interface ...
Datasheet	MC34972 PDF File

Overview

Freescale Semiconductor Technical Data Document Number: MC34972 Rev.
1.
0, 9/2013 Multiple Switch Detection Interface with Suppressed Wake-up 34972 The 34972 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 34972 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 34972 ideal for industrial products requiring low sleep-state currents.
This device is powered by SMARTMOS technology.
Features • Designed to operate 5.
5 V  VPWR  26 V • Switch input voltage range -14 V to VPWR, 40 V Max • Interfaces directly to MPU using 3.
3 V/5.
0 V SPI protocol • Selectable wake-up on change of state • Selectable wetting current (16 or 2.
0 mA) • Eight programmable inputs (switches to supply or ground) • 14 switch-to-ground inputs • Typical standby current - VPWR = 100 A and VDD = 20 A • Active interrupt (INT) on change-of-switch state MULTIPLE SWITCH DETECTION INTERFACE EW SUFFIX (Pb-FREE) 98ARH99137A 32-PIN SOICW EK SUFFIX (Pb-FREE) 98ASA10556D 32-PIN SOICW EP ORDERING INFORMATION Device Temperature Range (TA) Package MC34972ATEW/R2 MC34972ATEK/R2 -40 to 85 °C 32 SOICW 32 SOICW EP VPWR VPWR 34972 SP0 VPWR SP1 VDD SP7 WAKE SG0 SG1 SG12 SG13 SI SCLK CS SO INT AMUX GND VPWR VDD VDD POWER SUPPLY LVI ENABLE MCU MOSI SCLK CS MISO INT AN0 WATCHDOG RESET Figure 1.
34972 Simplified Application Diagram Freescale Semiconductor, Inc.
reserves the right to change t...

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