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Freescale Semiconductor Electronic Components Datasheet

MC33975A Datasheet

Multiple Switch Detection Interface

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MC33975A pdf
www.DFaretaeSshceeatl4eUS.ceommiconductor
Technical Data
Document order number: MC33975
Rev 4.0, 08/2005
Multiple Switch Detection
Interface with Suppressed
Wake-Up and 32mA Wetting
Current
Freescale offers multiple Switch Detection Interface Devices. The
33975 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.
33975
33975A
MULTIPLE SWITCH
DETECTION INTERFACE WITH
SUPPRESSED WAKE-UP
The 33975 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 33975 ideal for automotive and industrial products requiring low
sleep state currents.
Improvements are a programmable interrupt timer for Sleep mode
that can be disabled, switch detection currents of 32 mA and 4.0 mA
for switch-to-ground inputs, and an interrupt bit that can be reset.
EK Suffix (Pb-Free)
98ARL10543D
32-TERMINAL SOICW EP
Features
ORDERING INFORMATION
• Designed to Operate 5.5 V VPWR 28 V
• Switch Input Voltage Range -14 V to VPWR
• Interfaces Directly to Microprocessor Using 3.3 V/5.0 V SPI
Protocol
• Selectable Wake-Up on Change of State
Device
MC33975EK/R2
PC33975AEK/R2
Temperature
Range (TA)
-40°C to 125°C
Package
32 SOICW-EP
• Selectable Wetting Current (32 mA or 4.0 mA for switch-to-ground
inputs)
• 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
• Pb-free 32-terminal suffix EK
VDD
VBAT
VBAT
VBAT
33975
SP0 VPWR
SP1
VDD
SP7
SG0
SG1
SG12
WAKE
SI
SCLK
CS
SO
INT
AMUX
VDD
Power Supply
LVI
Enable
Watchdog
Reset
MCU
MOSI
SCLK
CS
MISO
INT
AN0
SG13
GND
Figure 1. 33975 Simplified Application Diagram
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2005. All rights reserved.



Freescale Semiconductor Electronic Components Datasheet

MC33975A Datasheet

Multiple Switch Detection Interface

No Preview Available !

MC33975A pdf
DEVICE VARIATIONS
DEVICE VARIATIONS
Table 1. Device Variations
Freescale Part No.
MC33975
PC33975A
Switch Input Voltage Range
-14 to 38 VDC
-14 to 40 VDC
Other Significant Device Variations
None
None
Reference
Location
5
5
33975
2
Analog Integrated Circuit Device Data
Freescale Semiconductor



Freescale Semiconductor Electronic Components Datasheet

MC33975A Datasheet

Multiple Switch Detection Interface

No Preview Available !

MC33975A pdf
SP0
SP1
SP2
SP3
SP4
SP5
SP6
SP7
SG0
SG1
SG2
SG3
SG4
SG5
SG6
SG7
SG8
SG9
SG10
SG11
SG12
SG13
INTERNAL BLOCK DIAGRAM
INTERNAL BLOCK DIAGRAM
VPWR VPWR
32.0 4.0
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
32.0
mA
4.0
mA
SP7
16.0
mA
2.0
mA
4.0 V
Ref
–+
To
SPI
Comparator
VPWR VPWR
32.0
mA
4.0
mA
SG0
5.0 V
VPWR
4.0 V
Ref
–+
To
SPI
Comparator
VPWR VPWR
32.0
mA
4.0
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 2. 33975 Simplified Internal Block Diagram
Analog Integrated Circuit Device Data
Freescale Semiconductor
33975
3




Part Number MC33975A
Description Multiple Switch Detection Interface
Maker Freescale Semiconductor
Total Page 30 Pages
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