33993 Datasheet, PDF (1/28 Pages) Freescale Semiconductor, Inc – Multiple Switch Detection Interface

Freescale Semiconductor
Advance Information
Multiple Switch Detection
Interface
Document Number: MC33993
Rev. 4.0, 6/2007
33993
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.
MULTIPLE SWITCH
DETECTION INTERFACE
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.
Features
DW SUFFIX
EK SUFFIX (PB-FREE)
98ARH99137A
32-PIN SOICW
ORDERING INFORMATION
• 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
Device
MC33993DWB/R2
MCZ33993EW/R2
Temperature
Range (T_A)
-40°C to 125°C
Package
32 SOICW
• 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 µA Typical, V_DD Standby Current 20 µA Typical
• Active Interrupt (INT) on Change-of-Switch State
• Pb-Free Packaging Designated by Suffix Code EW
VBAT
VBAT
VBAT
33993
SP0
SP1
VPWR
SP7
SG0
SG1
VDD
WAKE
SI
SCLK
CS
SO
INT
AMUX
V_DD
Power Supply
LVI
Enable
Watchdog
V_DD
Reset
MCU
MOSI
SCLK
CS
MISO
INT
AN0
SG12
SG13
GND
Figure 1. MC33993 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., 2003-2007. All rights reserved.