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MC33972 数据表(PDF) 1 Page - Freescale Semiconductor, Inc

部件名 MC33972
功能描述  Multiple Switch Detection Interface with Suppressed Wake-Up
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制造商  FREESCALE [Freescale Semiconductor, Inc]
网页  http://www.freescale.com
标志 FREESCALE - Freescale Semiconductor, Inc

MC33972 数据表(HTML) 1 Page - Freescale Semiconductor, Inc

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Document Number: MC33972
Rev 15, 8/2008
Freescale Semiconductor
Advance Information
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2007-2008. All rights reserved.
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 pull-up or pull-down 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.
Features
• Designed to operate 5.5V
≤ V
PWR ≤ 26V
• Switch input voltage range -14V to VPWR, 40V Max
• Interfaces directly to MPU using 3.3V/5.0V SPI protocol
• Selectable wake-up on change of state
• Selectable wetting current (16mA or 2.0mA)
• 8 programmable inputs (switches to battery or ground)
• 14 switch-to-ground inputs
• Typical standby current - VPWR = 100μA and VDD = 20μA
• Active interrupt (INT) on change-of-switch state
• Pb-free packaging designated by suffix code EW
• Exposed pad packaging designated by suffix code EK
Figure 1. 33972 Simplified Application Diagram
MULTIPLE SWITCH
DETECTION INTERFACE
DWB SUFFIX
EW SUFFIX (Pb-FREE)
98ARH99137A
32-PIN SOICW
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC33972DWB/R2
-40°C to 125°C
32 SOICW
MC33972EW/R2
MCZ33972EW/R2
MCZ33972AEW/R2
MC33972TDWB/R2
MC33972TEW/R2
MCZ33972TEW/R2
MCZ33972AEK/R2
32 SOICW EP
33972/A/T
EK SUFFIX (Pb-FREE)
98ASA10556D
32-PIN SOICW EP
VBAT
SP0
SP1
SP7
SG0
SG1
SG12
SG13
VPWR
VDD
WAKE
SI
CS
SO
INT
AMUX
GND
MOSI
SCLK
CS
MISO
INT
AN0
33972
MCU
SCLK
POWER SUPPLY
LVI
ENABLE
WATCHDOG
RESET
VDD
VBAT
VDD
VBAT


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