參數(shù)資料
型號(hào)： MC33993
廠商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述： Multiple Switch Detection Interface(多開(kāi)關(guān)監(jiān)測(cè)接口)
中文描述： 多交換檢測(cè)接口（多開(kāi)關(guān)監(jiān)測(cè)接口）
文件頁(yè)數(shù)： 1/28頁(yè)
文件大?。?/td> 820K
代理商： MC33993
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
Motorola, Inc. 2003
33993 Simplified Application Diagram
Document order number: MC33993/D
Rev 3.0, 08/2003
33993
Advance Information
Multiple Switch Detection Interface
The 33993 Multiple Switch Detection Interface 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 33993 device has two modes of operation, Sleep and Normal. The Sleep
mode provides low quiescent current and enables the wake-up features of the
device. 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 33993 is packaged in the 32-pin wide-body SOIC, reducing circuit board
area. Low quiescent current makes the 33993 ideal for automotive and industrial
products requiring low sleep state currents. The internal block diagram of the
33993 is illustrated in
Figure 1
, page 2.
Features
Designed to Operate 5.5 V
≤
V
PWR
≤
26 V
Switch Input Voltage Range -14 V to V
PWR
, 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
V
PWR
Standby Current 100
μ
A Typical, V
DD
Standby Current 20
μ
A Typical
Active Interrupt (
INT
) on Change-of-Switch State
V
DD
V
DD
V
PWR
Power Supply
LVI
Enable
Watchdog
Reset
V
DD
SI
SO
INT
SCLK
CS
AMUX
MOSI
SCLK
CS
MISO
INT
AN0
VBAT
SP0
SP1
SP7
SG1
SG0
SG12
SG13
WAKE
33993
MCU
GND
VBAT
VBAT
MULTIPLE SWITCH
DETECTION INTERFACE
DWB SUFFIX
CASE 1324
32-LEAD SOICW
ORDERING INFORMATION
Device
Temperature
Range (T
A
)
-40
°
C
to 125
°
C
Package
MC33993DWB/R2
32 SOICW
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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