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Motorola Electronic Components Datasheet

MC33972 Datasheet

Multiple Switch Detection Interface

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Freescale Semiconductor, Inc.
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Document order number: MC33972
Rev 3.0, 12/2004
Advance Information
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 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.
Features
• Designed to Operate 5.5 V VPWR 26 V
• Switch Input Voltage Range -14 V to VPWR, 40 V Max
• Interfaces Directly to Microprocessor Using 3.3 V/5.0 V SPI Protocol
• Selectable Wake-Up on Change of State
• Selectable Wetting Current (16 mA or 2.0 mA)
• 8 Programmable Inputs (Switches to Battery or Ground)
• 14 Switch-to-Ground Inputs
• VPWR Standby Current 100 µA Typical, VDD Standby Current 20 µA
Typical
• Active Interrupt (INT) on Change-of-Switch State
• Pb-Free Packaging Designated by Suffix Code EW
33972
MULTIPLE SWITCH
DETECTION INTERFACE WITH
SUPPRESSED WAKE-UP
DWB SUFFIX
EW (Pb-FREE) SUFFIX
CASE 1324-02
32-TERMINAL SOICW
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC33972DWB/R2
MC33972EW/R2
-40°C to 125°C
32 SOICW
VBAT
VBAT
VBAT
3397S2imSpilmifiepdliAfipepdlicAaptiponlicDaiatigoranmDiagram
VDD
33972
SP0
SP1
VPWR
VDD
SP7
SG0
SG1
SG12
WAKE
SI
SCLK
CS
SO
INT
AMUX
Power Supply
LVI
Enable
Watchdog
Reset
MCU
MOSI
SCLK
CS
MISO
INT
AN0
SG13
GND
This document contains information on a new product.
Specifications and information herein are subject to change without notice.
© Motorola, Inc. 2004
For More Information On This Product,
Go to: www.freescale.com


Motorola Electronic Components Datasheet

MC33972 Datasheet

Multiple Switch Detection Interface

No Preview Available !

Freescale Semiconductor, Inc.
SP0
SP1
SP2
SP3
SP4
SP5
SP6
SP7
SG0
SG1
SG2
SG3
SG4
SG5
SG6
SG7
SG8
SG9
SG10
SG11
SG12
SG13
33972
2
VPWR VPWR
16.0 2.0
mA mA
SP0
5.0 V
VPWR
16.0
mA
2.0
mA
4.0 V
Ref
+
To
SPI
Comparator
VPWR, VDD, 5.0 V
POR
Bandgap
Sleep PWR
VPWR
VDD
GND
VPWR VPWR
16.0 2.0
mA mA
SP7
16.0
mA
2.0
mA
4.0 V
Ref
+
To
SPI
Comparator
VPWR VPWR
16.0 2.0
mA mA
SG0
5.0 V
VPWR
4.0 V
Ref
+
To
SPI
Comparator
VPWR VPWR
16.0 2.0
mA mA
SG13
4.0 V
Ref
+
To
SPI
Comparator
Oscillator
and
Clock Control
Temperature
Monitor and
Control
5.0 V
5.0 V
VPWR
5.0 V
5.0 V
125 k
WAKE Control
SPI Interface
and Control
VDD
125 k
INT Control
MUX Interface
VDD
VDD
40 µA
VDD
+
Analog Mux
Output
WAKE
INT
CS
SCLK
SI
SO
AMUX
Figure 1. 33972 Simplified Internal Block Diagram
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
For More Information On This Product,
Go to: www.freescale.com


Part Number MC33972
Description Multiple Switch Detection Interface
Maker Motorola
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MC33972 Datasheet PDF






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