Freescale Semiconductor
Advance Information
Document Number: MC33993
Rev. 4.0, 6/2007
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.
33993
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
DW SUFFIX
current as it monitors switch change of state.
EK SUFFIX (PB-FREE)
98ARH99137A
The 33993 is packaged in the 32-pin wide-body SOIC, reducing
32-PIN SOICW
circuit board area. Low quiescent current makes the 33993 ideal for
automotive and industrial products requiring low sleep state currents.
ORDERING INFORMATION
Features
Temperature
• Designed to Operate 5.5 V
≤
V
PWR
≤
26 V
Device
Package
Range (T
A
)
• Switch Input Voltage Range -14 V to V
PWR
, 40 V Max
MC33993DWB/R2
• Interfaces Directly to Microprocessor Using 3.3 V / 5.0 V SPI
-40°C to 125°C
32 SOICW
Protocol
MCZ33993EW/R2
• 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
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
V
DD
VBAT
Power Supply
LVI
VBAT
SP0
SP1
VBAT
SP7
33993
VPWR
V
DD
VDD
WAKE
SI
SCLK
CS
SO
INT
AMUX
Enable
Watchdog
Reset
MCU
SG0
SG1
MOSI
SCLK
CS
MISO
INT
AN0
SG12
GND
SG13
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.
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
