Datasheet > MC34978EK

MC34978EK

更新时间： 2024-11-05 14:59:31

品牌	Logo	应用领域
恩智浦 - NXP		/
页数	文件大小	规格书
65页	1022K
描述
Switch Detection Interface, 22-switches, 3.3 V / 5.0 V SPI , SOICW-EP 32

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MC34978EK 数据手册

Document Number: MC33978

Rev. 7.0, 8/2017

NXP Semiconductors

Advance Information

22 channel multiple switch detection

interface with programmable wetting

current

33978

34978

MULTIPLE SWITCH DETECTION INTERFACE

The 33978 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). This

SMARTMOS device also features a 24-to-1 analog multiplexer for reading the

input channels as analog inputs. The analog selected input signal is buffered and

provided on the AMUX output pin for the MCU to read.

Independent programmable wetting currents are available as needed for the

application. A battery and temperature monitor are included in the IC and

available via the AMUX pin.

ES SUFFIX (PB-FREE)

98ASA00656D

EK SUFFIX (PB-FREE)

98ASA10556D

The 33978 device has two modes of operation, Normal and Low-power mode

(LPM). Normal mode allows programming of the device and supplies switch

contacts with pull-up or pull-down current as it monitors the change of state on

the switches. The LPM provides low quiescent current, which makes the 33978

ideal for automotive and industrial products requiring low sleep-state currents.

32-PIN QFN (WF-TYPE)

32-PIN SOICW-EP

Applications

• Automotive

• Heating ventilation and air conditioning (HVAC)

• Lighting

Features

• Central gateway/in-vehicle networking

• Gasoline engine management

• Industrial

• Fully functional operation 4.5 V ≤ V_BATP≤ 36 V

• Full parametric operation 6.0 V ≤ V_BATP≤ 28 V

• Operating switch input voltage range from -1.0 V to 36 V

• Eight programmable inputs (switches to battery or ground)

• 14 switch-to-ground inputs

• Selectable wetting current (2, 6, 8, 10, 12, 14, 16, or 20 mA)

• Interfaces directly to an MCU using 3.3 V / 5.0 V SPI protocol

• Selectable wake-up on change of state

• Programmable logic control (PLC)

• Process control, temperature control

• Input-output control (I/O Control)

• Single board computer

• Ethernet switch

• Typical standby current I_BATP= 30 μA and I_DDQ= 10 μA

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

• Integrated battery and temperature sensing

Notes

1. The IC is functional from 4.5 V < V_BATP< 6.0 V, but with degraded parametric values. The parameters may not meet the minimum and maximum

specifications when VBATP drops below 6.0 V.

V_DDQ

Battery

Power

Supply

33978

SG1

Battery

VBATP

SP0

Power

Supply

WAKE_B

MCU

SP1

VDDQ

INT_B

CS_B

INTB

SP7

SG0

CSB

MISO

MOSI

SCLK

MOSI

SCLK

AN0

AMUX

SG12

SG13

GND

Figure 1. 33978 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...65

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