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MC34978AEK

更新时间： 2024-11-04 19:33:47
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, Rail

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MC34978AEK 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：ActiveReach Compliance Code：compliant
风险等级：5.68Base Number Matches：1

MC34978AEK 数据手册

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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 ≤ VBATP ≤ 36 V  
• Full parametric operation 6.0 V ≤ VBATP ≤ 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 IBATP = 30 μA and IDDQ = 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 < VBATP < 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.  
VDDQ  
Battery  
Power  
Supply  
33978  
SG1  
Battery  
VBATP  
SP0  
Power  
Supply  
WAKE_B  
MCU  
SP1  
VDDQ  
INT_B  
CS_B  
INTB  
SP7  
SG0  
CSB  
MISO  
MISO  
MOSI  
SCLK  
MOSI  
SCLK  
AN0  
AMUX  
SG12  
SG13  
EP  
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.  
© NXP B.V. 2017.  
 
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