Datasheet > 33884

33884

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
飞思卡尔 - FREESCALE		显示器
页数	文件大小	规格书
21页	700K
描述
Switch Monitor Interface

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33884 数据手册

Document Number: MC33884

Rev. 4.0, 11/2006

Freescale Semiconductor

Technical Data

Switch Monitor Interface

The 33884 Switch Monitor Interface is a monolithic silicon integrated

circuit (IC) to perform switch monitoring functions. The device provides

efficient interface between electrical switches and low voltage

microprocessors. The 33884 supplies switch contact pull-up and pull

down current while monitoring the input voltage level. All inputs are

protected for transients when implemented with an appropriate static

discharge capacitor used on the inputs.

33884

SWITCH MONITOR INTERFACE

There are four modes of operation: Sleep, Normal, Polling, and

Polling + INT Timer.

The Polling and Timer modes are similar, except the Timer mode

has the addition of an interrupt that is sent to the microprocessor if a

switch is sensed closed, or upon the internal interrupt timer times out.

An interrupt is ultimately sent to the microprocessor. All modes of

operation are easily programmed via the Serial Peripheral Interface

(SPI) control.

DW SUFFIX

EG (PB-FREE) SUFFIX

98ASB42344B

24-PIN SOICW

Features

• Full Operation with 7.0 V < V_PWR< 26 V, Limited Operation with

5.5 V < V_PWR< 7.0 V

• Input Voltage Range: -14 V to 40 V

• Interface Directly to Microprocessors Using SPI Protocol

• Wake Up on Change of Monitored Switch Status

• Programmable Wetting Current

ORDERING INFORMATION

Temperature

Device

Package

Range (T )

MC33884DW/R2

MCZ33884EG/R2

-40°C to 105°C

24 SOICW

• Four Switch-to-Ground Switches

• Six (Fixed Function) Inputs Monitoring Six Switch-to-Ground

Switches

• Two (Fixed Function) Inputs Monitoring Two Switch-to-Battery Switches

• Quiescent Current in Sleep Mode < 10 µA

• Reset Input Defaults the Device to Sleep Mode

• Pb-Free Packaging Designated by Suffix Code EG

PWR

33884

VPWR

VDD

MCU

VDD

SB1

SB2

2 V

Sense Inputs

PWR

SP1

SP2

SP3

SP4

MOSI

MISO

CLK

SCLK

INT

4 GND / V

PWR

INT

Sense Inputs

RESET

GND

VBG

RESET

GND

SG1

SG2

SG3

SG4

SG5

SG6

SYNC

MASL

6 GND

Sense Inputs

Figure 1. 33884 Simplified Application Diagram

Freescale Semiconductor, Inc. reserves the right to change the detail specifications, as

may be required, to permit improvements in the design of its products.

12 3 4 5 6 7...21

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