Document Number: MC33993
Rev. 6, 5/2008
Freescale Semiconductor
Advance Information
Multiple Switch Detection
Interface
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.
DW SUFFIX
EW SUFFIX (PB-FREE)
98ARH99137A
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.
32-PIN SOICW
ORDERING INFORMATION
Features
Temperature
Package
• Designed to Operate 5.5 V ≤ VPWR ≤ 26 V
• Switch Input Voltage Range -14 V to VPWR, 40 V Max
Device
Range (T )
A
MC33993DWB/R2
MCZ33993EW/R2
• Interfaces Directly to Microprocessor Using 3.3 V/5.0 V SPI
Protocol
-40°C to 125°C
32 SOICW
• 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
• VPWR Standby Current 100 µA Typical, VDD Standby Current 20 µA Typical
• Active Interrupt (INT) on Change-of-Switch State
• Pb-Free Packaging Designated by Suffix Code EW
VDD
Power Supply
LVI
VBAT
VBAT
33993
MCU
Enable
SP0
SP1
VPWR
Watchdog
Reset
VDD
VBAT
VDD
SP7
WAKE
SI
MOSI
SCLK
CS
SCLK
CS
SG0
SG1
SO
MISO
INT
INT
AMUX
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.
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