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NXP Semiconductors Electronic Components Datasheet

34972 Datasheet

Multiple Switch Detection Interface

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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 the detail specifications,
as may be required, to permit improvements in the design of its products.
© Freescale Semiconductor, Inc., 2013. All rights reserved.


NXP Semiconductors Electronic Components Datasheet

34972 Datasheet

Multiple Switch Detection Interface

No Preview Available !

INTERNAL BLOCK DIAGRAM
SP0
SP1
SP2
SP3
SP4
SP5
SP6
SP7
SG0
SG1
SG2
SG3
SG4
SG5
SG6
SG7
SG8
SG9
SG10
SG11
SG12
SG13
34972
2
INTERNAL BLOCK DIAGRAM
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
4.0V
Ref
–+
To
SPI
Comparator
VPWR VPWR
16.0
2.0
mA
mA
SG0
5.0V
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 A
VDD
+
Analog Mux
Output
Figure 2. 34972 Simplified Internal Block Diagram
WAKE
INT
CS
SCLK
SI
SO
AMUX
Analog Integrated Circuit Device Data
Freescale Semiconductor


Part Number 34972
Description Multiple Switch Detection Interface
Maker NXP
Total Page 3 Pages
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