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935310479518

更新时间： 2024-09-24 03:15:15

品牌	Logo	应用领域
恩智浦 - NXP		/
页数	文件大小	规格书
32页	1256K
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Interface Circuit

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935310479518 数据手册

Document Number: MC33972

Rev. 19.0, 3/2012

Freescale Semiconductor

Technical Data

Multiple Switch Detection

Interface with Suppressed

Wake-up

33972/A/T

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 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.

EW SUFFIX (Pb-FREE)

EK SUFFIX (Pb-FREE)

98ASA10556D

32-PIN SOICW EP

98ARH99137A

32-PIN SOICW

ORDERING INFORMATION

Features

Temperature

• Designed to operate 5.5 V ≤ V_PWR≤ 26 V

Device

Package

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 or 2.0 mA)

• 8 programmable inputs (switches to battery or ground)

• 14 switch-to-ground inputs

MC33972TEW/R2

MC33972ATEW/R2

MC33972ATEK/R2

32 SOICW

-40 °C to 125 °C

32 SOICW EP

• Typical standby current - V_{PWR =}100 μA and V_DD= 20 μA

• Active interrupt (INT) on change-of-switch state

VDD

POWER SUPPLY

VBAT

LVI

33972

SP0

SP1

VPWR

VDD

VBAT

ENABLE

VDD

SP7

WAKE

SG0

SG1

MCU

SCLK

INT

MOSI

WATCHDOG

RESET

SCLK

MISO

INT

SG12

SG13

AMUX

AN0

GND

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.

12 3 4 5 6 7...32

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