MC33993 Datasheet, PDF (1/28 Pages) Motorola, Inc – Multiple Switch Detection Interface

MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Document order number: MC33993/D
Rev 2.0, 07/2003
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.
33993
MULTIPLE SWITCH
DETECTION INTERFACE
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 µA Typical, V_DD Standby Current 20 µA Typical
• Active Interrupt (INT) on Change-of-Switch State
DWB SUFFIX
CASE 1324
32-LEAD SOICW
ORDERING INFORMATION
Device
Temperature
Range (T_A)
Package
MC33993DWB/R2 -40°C to 125°C 32 SOICW
VBAT
VBAT
VBAT
33993 Simplified Application Diagram
33993
SP0
SP1
V_PWR
SP7
SG0
SG1
V_DD
WAKE
SI
SCLK
CS
SO
INT
AMUX
SG12
SG13
GND
Power Supply
LVI
Enable
Watchdog
V_DD
Reset
V_DD
MCU
MOSI
SCLK
CS
MISO
INT
AN0
This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Motorola, Inc. 2003