NXP Semiconductors MC33978/34978 开关检测接口集成电路

飞思卡尔 MC34978/34978 开关检测接口集成电路是多开关检测接口(MSDI)器件,可在汽车或工业环境中检测多达 22 个开关触点的闭开状态。开关的开闭状态通过一个串行外设接口(SPI)传送到微处理器单元(MCU)。这款 SMARTMOS 器件还有一个 24 到 1 的模拟乘法器,用于读取模拟输入。模拟输入信号经过缓冲,提供到模拟乘法器(AMUX)输出引脚,以供 MCU 来读取。在正常和低功耗工作(LPM)模式下,有可分别选择的输入电流,可根据应用的需要来选取。该集成电路内含电池和温度监控器,可通过 AMUX 引脚访问。该产品接口可连接支持 SPI 通信的任何微控制器。

特性

  • Designed to operate 4.5V ≤VBATP ≤36V
  • Switch input voltage range -14V to VPWR, 36V Max.
  • Interfaces directly to an MCU using 3.3V / 5.0V SPI protocol selectable wake-up on change of state
  • Selectable wetting current (2, 6, 8, 10, 12, 14, 16, or 20mA)
  • 8 programmable inputs (switches to battery or ground) and 14 switch-to-ground inputs
  • Typical standby current - VBATP = 30uA and VDD = 10uA
  • Integrated battery and temperature sensing

应用

  • Industrial (MC34978)
    • Programmable Logic Control (PLC)
    • Process control, temperature control
    • Input-output control (I/O control)
    • Ethernet switch
    • Access panels, elevators, security, HVAC
  • Automotive (MC33978) entry level body control module
    • High-end body control module
    • Central gateway / in-vehicle networking
    • Gasoline engine management

Functional Internal Block Diagram

框图 - NXP Semiconductors MC33978/34978 开关检测接口集成电路
发布日期: 2015-03-12 | 更新日期: 2022-03-11