Datasheet > 33975_08

33975_08

更新时间： 2022-12-26 14:42:17

品牌	Logo	应用领域
飞思卡尔 - FREESCALE		/
页数	文件大小	规格书
34页	1316K
描述
Multiple Switch Detection Interface with Suppressed Wake-up and 32mA Wetting Current

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33975_08 数据手册

Document Number: MC33975

Rev 9.0, 8/2008

Freescale Semiconductor

Advance Information

Multiple Switch Detection

Interface with Suppressed

Wake-up and 32mA Wetting

Current

33975

33975A

MULTIPLE SWITCH

DETECTION INTERFACE WITH

SUPPRESSED WAKE-UP

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.

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 the 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.

Improvements are a programmable interrupt timer for Sleep Mode

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

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

EK SUFFIX (PB-FREE)

98ASA10556D

32-PIN SOICW EP

Features

• Designed to operate from 5.5V ≤ V_PWR≤ 28V

• Switch input voltage: (33975: -14 to 38V) (33975A: -14 to 40V)

• Interfaces to microprocessor using 3.3V/5.0V SPI protocol

• Selectable wake-up on change of state

ORDERING INFORMATION

Temperature

Device

Package

Range (T )

MC33975EK/R2

MCZ33975EK/R2

MCZ33975AEK/R2

• 14 switch-to-ground inputs

• 8 programmable inputs (switches to battery or ground)

• Selectable wetting current (32mA or 4.0mA for switch-to-ground

inputs)

-40°C to 125°C

32 SOICW-EP

• Sleep State current V_PWR100μA, Vdd 20μA

• Pb-free packaging designated by suffix code EK

VDD

POWER SUPPLY

LVI

V_BAT

33975

SP0

SP1

VPWR

VDD

V_BAT

ENABLE

VDD

SP7

WAKE

SG0

SG1

MCU

SCLK

MOSI

WATCHDOG

RESET

SCLK

SG12

SG13

MISO

INT

AMUX

AN0

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...34

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