MC33972ATEW Freescale Semiconductor, MC33972ATEW Datasheet
MC33972ATEW
Manufacturer Part Number
MC33972ATEW
Description
IC SWITCH DETECT SPI 32-SOIC
Manufacturer
Freescale Semiconductor
Specifications of MC33972ATEW
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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MC33972
Multiple Switch Detection Interface
with Suppressed Wake-Up
Analog Products Fact Sheet
DESCRIPTION
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 terminal 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.
APPLICATIONS
• Automotive Systems
• Aircraft Systems
• Industrial Control Systems
• Process Control Systems
• Security Systems
• Critical systems requiring switch status
verification for safety, operation, or process
control purposes
33972 SIMPLIFIED APPLICATION DIAGRAM
PERFORMANCE
Outputs
Switch Voltage Range
Operating Voltage
Contact Wetting Current
Quiescent Current:
Control
Operating Temperature
VPWR
VDD
V BAT
V BAT
V BAT
SP0
SP1
SP7
SG0
SG1
SG12
SG13
33972
WAKE
AMUX
VPWR
SCLK
GND
VDD
INT
CS
SO
SI
5.5 V ≤ V
-40°C ≤ T
TYPICAL VALUES
V DD
2.0 mA or 16 mA
-14 to V
< 100 µA
< 20 µA
SPI
Enable
PWR
Power Supply
4
A
Conditioning
and Sensing
≤ 125°C
Watchdog
PWR
LVI
Flexible I/O
≤ 26 V
Reset
Signal
V DD
MOSI
SCLK
CS
MISO
INT
AN0
MCU
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MC33972ATEW Summary of contents
Page 1
Analog Products Fact Sheet MC33972 Multiple Switch Detection Interface with Suppressed Wake-Up DESCRIPTION The 33972 Multiple Switch Detection Interface with Suppressed Wake-Up is designed to detect the closing and opening switch contacts. The switch status, either ...
Page 2
... Simple power conservation solution providing a WAKE output for system wake-up from Sleep mode Freescale™ and the Freescale logo are trademarks of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. © Freescale Semiconductor, Inc. 2006. All rights reserved. ...