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
Additional Resources
发布日期: 2015-03-12
| 更新日期: 2022-03-11
