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33975A

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
32页	884K
描述
Multiple Switch Detection Interface with Suppressed Wake-Up and 32mA Wetting Current

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33975A 数据手册

Document order number: MC33975

Rev 4.0, 08/2005

Freescale Semiconductor

Technical Data

Multiple Switch Detection

Interface with Suppressed

Wake-Up and 32mA Wetting

Current

Freescale offers multiple Switch Detection Interface Devices. The

33975 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.

33975

33975A

MULTIPLE SWITCH

DETECTION INTERFACE WITH

SUPPRESSED WAKE-UP

The 33975 device has two modes of operation, Normal and Sleep.

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 Sleep mode provides low quiescent current, which makes

the 33975 ideal for automotive and industrial products requiring low

sleep state currents.

EK Suffix (Pb-Free)

98ARL10543D

32-TERMINAL SOICW EP

Improvements are a programmable interrupt timer for Sleep mode

that can be disabled, switch detection currents of 32 mA and 4.0 mA

for switch-to-ground inputs, and an interrupt bit that can be reset.

ORDERING INFORMATION

Temperature

Features

• Designed to Operate 5.5 V ≤ V_PWR≤ 28 V

• Switch Input Voltage Range -14 V to V_PWR

• Interfaces Directly to Microprocessor Using 3.3 V/5.0 V SPI

Protocol

Device

Package

Range (T )

MC33975EK/R2

PC33975AEK/R2

-40°C to 125°C

32 SOICW-EP

• Selectable Wake-Up on Change of State

• Selectable Wetting Current (32 mA or 4.0 mA for switch-to-ground

inputs)

• 8 Programmable Inputs (Switches to Battery or Ground)

• 14 Switch-to-Ground Inputs

• V_PWRStandby Current 100 µA Typical, V_DDStandby Current 20 µA Typical

• Pb-free 32-terminal suffix EK

Power Supply

LVI

BAT

33975

BAT

Enable

SP0

SP1

VPWR

MCU

Watchdog

Reset

VDD

BAT

SP7

WAKE

SCLK

MOSI

SCLK

SG0

SG1

MISO

INT

AMUX

AN0

SG12

SG13

GND

Figure 1. 33975 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...32

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