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PC33975AR2 Datasheet

  • PC33975AR2

  • Multiple Switch Detection Interface with Suppressed Wake-Up ...

  • 32頁

  • FREESCALE

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Freescale Semiconductor
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.
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.
Features
33975
33975A
MULTIPLE SWITCH
DETECTION INTERFACE WITH
SUPPRESSED WAKE-UP
EK Suffix (Pb-Free)
98ARL10543D
32-TERMINAL SOICW EP
ORDERING INFORMATION
Temperature
Range (T
A
)
-40擄C to 125擄C
Package
鈥?Designed to Operate 5.5 V
鈮?/div>
V
PWR
鈮?/div>
28 V
Device
鈥?Switch Input Voltage Range -14 V to V
PWR
MC33975EK/R2
鈥?Interfaces Directly to Microprocessor Using 3.3 V/5.0 V SPI
Protocol
PC33975AEK/R2
鈥?Selectable Wake-Up on Change of State
鈥?Selectable Wetting Current (32 mA or 4.0 mA for switch-to-ground
inputs)
鈥?8 Programmable Inputs (Switches to Battery or Ground)
鈥?14 Switch-to-Ground Inputs
鈥?V
PWR
Standby Current 100
碌A(chǔ)
Typical, V
DD
Standby Current 20
碌A(chǔ)
Typical
鈥?Pb-free 32-terminal suffix EK
VDD
VBAT
VBAT
SP0
SP1
VBAT
SP7
Power Supply
LVI
Enable
VDD
VDD
Watchdog
Reset
32 SOICW-EP
33975
VPWR
MCU
WAKE
SI
SCLK
CS
SO
INT
AMUX
MOSI
SCLK
CS
MISO
INT
AN0
SG0
SG1
SG12
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.
漏 Freescale Semiconductor, Inc., 2005. All rights reserved.

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