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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

鈥?/div>

Designed to Operate 5.5 V

鈮?/div>

V

PWR

鈮?/div>

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

碌A

Typical, V

DD

Standby Current 20

碌A

Typical

Active Interrupt (

INT

) on Change-of-Switch State

DWB SUFFIX

CASE 1324

32-LEAD SOICW

ORDERING INFORMATION

Device

MC33993DWB/R2

Temperature

Range (T

A

)

-40

掳

C to 125

掳

C

Package

32 SOICW

33993 Simplified Application Diagram

V

DD

VBAT

Power Supply

LVI

VBAT

SP0

SP1

VBAT

SP7

33993

V

PWR

V

DD

V

DD

WAKE

SI

SCLK

CS

SO

INT

AMUX

Enable

Watchdog

Reset

MCU

SG0

SG1

MOSI

SCLK

CS

MISO

INT

AN0

SG12

GND

SG13

This document contains certain information on a new product.

Specifications and information herein are subject to change without notice.

漏 Motorola, Inc. 2003

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