33972T datasheet, PDF - EEWORLD Datasheet

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33972T: Descriptionmultiple switch detection interface with suppressed wake-up; File Size858KB，32 Pages; ManufacturerFREESCALE (NXP)

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multiple switch detection interface with suppressed wake-up

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Freescale Semiconductor

Technical Data

Document Number: MC33972

Rev. 16.0, 10/2009

Multiple Switch Detection

Interface with Suppressed

Wake-up

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 pull-up or pull-down 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.

Features

•

Designed to operate 5.5 V

≤

PWR

≤

26 V

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 or 2.0 mA)

8 programmable inputs (switches to battery or ground)

14 switch-to-ground inputs

Typical standby current - V

PWR =

100

μA

and V

= 20

μA

Active interrupt (

INT

) on change-of-switch state

Pb-free packaging designated by suffix code EW

Exposed pad packaging designated by suffix code EK

33972/A/T

MULTIPLE SWITCH

DETECTION INTERFACE

DWB SUFFIX

EW SUFFIX (Pb-FREE)

98ARH99137A

32-PIN SOICW

EK SUFFIX (Pb-FREE)

98ASA10556D

32-PIN SOICW EP

ORDERING INFORMATION

Device

MC33972DWB/R2

MC33972EW/R2

MCZ33972EW/R2

MCZ33972AEW/R2

MC33972TDWB/R2

MC33972TEW/R2

MCZ33972TEW/R2

MCZ33972AEK/R2

VDD

VBAT

SP0

SP1

VBAT

SP7

SG0

SG1

SG12

SG13

SCLK

INT

AMUX

GND

VBAT

POWER SUPPLY

Temperature

Range (T

)

Package

-40°C to 125°C

32 SOICW

32 SOICW EP

33972

VPWR

VDD

WAKE

VDD

LVI

ENABLE

MOSI

SCLK

MISO

INT

AN0

MCU

WATCHDOG

RESET

Figure 1. 33972 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.

33972T Related Products

	33972T	33972	33972_09
Description	multiple switch detection interface with suppressed wake-up	multiple switch detection interface with suppressed wake-up	multiple switch detection interface with suppressed wake-up

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