MAX20091

35-Channel Contact Monitor

Monitor the Status of 35 Automotive Switches with a Single Microcontroller


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说明

The MAX20091 is a 35-channel automotive contact monitor for automotive applications. Ten contact monitor inputs can be used with either ground- or battery-connected switches; the other 25 inputs are for use with ground-connected switches.

The IC operates over a 5.5V to 28V voltage range and withstands voltages up to 42V. It protects low-voltage circuitry from high voltages and reverse-battery conditions. The IC’s low-current operation under all operating conditions makes it suitable for use in electronic control units (ECUs) that are connected directly to the automotive battery. The IC has an adjustable scan mode that reduces the current drawn in key-off while maintaining polling capability.

The IC features an SPI interface to monitor the switch status and set the device configuration. An interrupt output allows the device to wake a local microcontroller when a switch status change is detected. In addition, a switch status change turns on the internal regulator.

The MAX20091 is available in a compact 48-pin TQFN package and operates over the -40°C to +125°C temperature range.

MAX20091: Functional Diagram MAX20091: Functional Diagram 放大+

关键特性

  • Reduces Cost by Eliminating Multiple Microprocessors for Switch-Monitoring Functions
    • Configurable Wetting Current Improves Switch Performance
    • SPI Interface for Control/Readback
    • Built-In Hysteresis and Deglitching
    • Interrupt Output to Processor
  • High Channel Count Reduces PCB Area Requirements
  • Very Low Operating Current Enables Scanning in Key-Off State with Minimal Current Draw from 12V Battery
    • Ultra-Low 88µA (typ) Operating Current in Polling Mode
  • Robust Switch Input Eliminate Need for External Protection Components
    • 5.5V to 28V Operating Voltage Range
    • Switch Inputs Withstand 42V and Reverse Battery
    • IN0-34 ESD Performance to ISO 10605 (In-Circuit): ±10kV Contact

应用

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  • 门控模块
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Part NumberFunctionsSwitch InputsSwitch Input Threshold
(V)
Switch Input Threshold Hysteresis
(V)
Output PolarityESD Protect.
(±kV)
VSUPPLY
(V)
VSUPPLY
(V)
ICC
(µA)
Package/Pins
minmaxmax
MAX20091 Contact Monitor
8
24
35
1.8 to 4.30.2Active Low107.528130
TQFN-CU/48
查看所有Switch/Contact Monitors (4)
Pricing Notes:
价格仅供参考,用于同类产品的比较。所提供报价为美元,需要依汇率折合成人民币。该价格将因当地关税、税率和汇率而异。有关特定订购量和指定版本的报价和供货问题,请参考:价格与供货网站或与指定代理商联系。

质量和环境数据

申请可靠性报告: MAX20091 
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CAD Symbols and Footprints

  • MAX20091ATM/V+
  • MAX20091ATM/V+T
  • 型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C  

    备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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