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33975A Schematic ( PDF Datasheet ) - Freescale Semiconductor

Teilenummer 33975A
Beschreibung Multiple Switch Detection Interface
Hersteller Freescale Semiconductor
Logo Freescale Semiconductor Logo 




Gesamt 30 Seiten
33975A Datasheet, Funktion
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.






33975A Datasheet, Funktion
STATIC ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table 4. Static Electrical Characteristics
Characteristics noted under conditions of 3.0 V VDD 5.5 V, 8.0 V VPWR 28V, -40°C TC 125°C unless otherwise
noted. Where applicable, typical values reflect the parameter’s approximate average value with VPWR = 13 V, TA = 25°C.
Characteristic
Symbol
Min
Typ
Max Unit
POWER INPUT
Supply Voltage
Supply Voltage Range Quasi-Functional (6)
Fully Operational
Supply Voltage Range Quasi-Functional (7)
VPWR(qf)
VPWR(fo)
VPWR(qf)
5.5
8.0
28
V
– 8.0
– 28
– 38/40
Supply Voltage
VPWR Supply Voltage Power On Reset
VPWR(POR)
Supply Current
All Switches Open, Normal Mode, Tri-State Disabled
IPWR(on)
Sleep State Supply Current
Scan Timer = 64 ms, Switches Open
IPWR(ss)
Logic Supply Voltage
Logic Supply Current
All Switches Open, Normal Mode
VDD
IDD
Sleep State Logic Supply Current
Scan Timer = 64 ms, Switches Open
IDD(ss)
SWITCH INPUT
Pulse Wetting Current Switch-to-Battery (Current Sink)
5.5 V VPWR 28 V
Pulse Wetting Current Switch-to-Ground (Current Source)
5.5 V VPWR 8.0 V
8.0 V VPWR 28 V
Sustain Current Switch-to-Battery Input (Current Sink)
5.5 V VPWR 28 V
Sustain Current Switch-to-Ground Input (Current Source)
5.5 V VPWR 8.0 V
8.0 V VPWR 28 V
IPulse
IPulse
Isustain
Isustain
Sustain Current Matching Between Channels on Switch-to-Ground Inputs
ISUS(MAX) - ISUS(MIN)
ISUS(MIN)
X 100
IMatch
4.2
40
3.0
12
7.0
24
1.8
0.5
3.6
4.6
4.0
70
0.25
10
15
9.0
32
2.1
1.0
4.0
2.0
V
5.0
mA
8.0
µA
100
5.5 V
mA
0.5
µA
20
mA
18
mA
36
mA
2.4
mA
4.4
%
5.0
Notes
6. Device operational. Wetting and sustain currents are reduced. Operating the analog multiplexer below 8.0 V is not recommended.
7. Thermal considerations must be taken when operating the device above 28 V.
33975
6
Analog Integrated Circuit Device Data
Freescale Semiconductor

6 Page









33975A pdf, datenblatt
FUNCTIONAL DESCRIPTIONS
FUNCTIONAL TERMINAL DESCRIPTION
WAKE INPUT (WAKE)
The WAKE terminal is an open-drain output and a wake-up
input. The terminal is designed to control a power supply
Enable terminal. In the Normal mode, the WAKE terminal is
low. In the Sleep mode, the WAKE terminal is high. The
WAKE terminal has a pull-up to the internal +5.0 V supply.
In Sleep mode with the WAKE terminal high, falling edge of
WAKE will place the 33975 in Normal mode. In Sleep mode
with VDD applied, the INT terminal must be high for negative
edge of WAKE to wake up the device. If VDD is not applied to
the device in Sleep mode, INT does not affect WAKE
operation.
LOAD SUPPLY VOLTAGE (VPWR)
The VPWR terminal is battery input and Power-ON Reset
to the 33975 IC. The VPWR terminal requires external
reverse battery and transient protection. Maximum input
voltage on VPWR is 50 V. All wetting, sustain, and internal
logic current is provided from the VPWR terminal.
LOGIC VOLTAGE (VDD)
The VDD input terminal is used to determine logic levels
on the microprocessor interface (SPI) terminals. Current from
VDD is used to drive SO output and the pull-up current for CS
and INT terminals. VDD must be applied for wake-up from
negative edge of CS or INT.
GROUND (GND)
The GND terminal provides ground for the IC as well as
ground for inputs programmed as switch-to-battery inputs.
PROGRAMMABLE SWITCHES (SP0–SP7)
The 33975 device has 8 switch inputs capable of being
programmed to read switch-to-ground or switch-to-battery
contacts. The input is compared with a 4.0 V reference.
When programmed to be switch-to-battery, voltages greater
than 4.0 V are considered closed. Voltages less than 4.0 V
are considered open. The opposite holds true when inputs
are programmed as switch-to-ground. Programming features
are defined in Table 6 through Table 11 in the Functional
Device Operation section of this datasheet beginning on
page 14. Voltages greater than the VPWR supply voltage will
source current through the SP inputs to the VPWR terminal.
Transient battery voltages greater than 38/40 V must be
clamped by an external device.
SWITCH-TO-GROUND (SG0–SG13)
The SGn terminals are switch-to-ground inputs only. The
input is compared with a 4.0 V reference. Voltages greater
than 4.0 V are considered open. Voltages less than 4.0 V are
considered closed. Programming features are defined in
Table 6 through Table 11 in the Functional Device Operation
section of this datasheet beginning on page 14. Voltages
greater than the VPWR supply voltage will source current
through the SG inputs to the VPWR terminal. Transient
battery voltages greater than 38/40 V must be clamped by an
external device.
33975
12
Analog Integrated Circuit Device Data
Freescale Semiconductor

12 Page





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