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33972A

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
飞思卡尔 - FREESCALE		/
页数	文件大小	规格书
28页	1735K
描述
Multiple Switch Detection Interface with Suppressed Wake-Up

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33972A 数据手册

Document Number: MC33972

Rev. 9.0, 4/2007

Freescale Semiconductor

Advance Information

Multiple Switch Detection

Interface with Suppressed

Wake-Up

33972

33972A

MULTIPLE SWITCH

DETECTION INTERFACE

The 33972 Multiple Switch Detection Interface with Suppressed

Wake-Up 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 33972 device has two modes of operation, Normal and Sleep.

Normal mode allows programming of the device and supplies switch

contacts with pullup or pulldown current as it monitors switch change

of state. The Sleep mode provides low quiescent current, which makes

the 33972 ideal for automotive and industrial products requiring low

sleep state currents.

DWB SUFFIX

EW SUFFIX (Pb-FREE)

98ARH99137A

32-PIN SOICW

ORDERING INFORMATION

Features

Temperature

Package

• Designed to Operate 5.5 V ≤ V_PWR≤ 26 V

Device

Range (T )

• Switch Input Voltage Range -14 V to V_PWR, 40 V Max

• Interfaces Directly to MPU 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

MC33972DWB/R2

MC33972EW/R2

MCZ33972AEW/R2

-40°C to 125°C

32 SOICW

• Typical Standby Current - V_{PWR =}100 µA and V_DD= 20 µA

• Active Interrupt (INT) on Change-of-Switch State

• Pb-Free Packaging Designated by Suffix Code EW

Power Supply

LVI

BAT

33972

BAT

Enable

SP0

SP1

VPWR

Watchdog

Reset

VDD

BAT

MCU

SP7

WAKE

SCLK

MOSI

SCLK

SG0

SG1

MISO

INT

AMUX

AN0

SG12

SG13

GND

Figure 1. 33972 Simplified Application Diagram

* This document contains certain information on a new product.

Specifications and information herein are subject to change without notice.

12 3 4 5 6 7...28

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