MC34972ATEK数据手册恩XP中文资料规格书

描述 Description

The NXP® MC34972 Multiple Switch Detection Interface (MSDI) with suppressed wake-up 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 MCU through a serial peripheral interface (SPI)
The device also features a 22-to-1 analog multiplexer for reading inputs as analog
The analog input signal is buffered and provided on the AMUX output pin for the MCU to read

特性 Features

• Designed to operate 5.5 V PWR PWR, 40 V Max
• Interfaces directly to MPU using 3.3 V / 5.0 V SPI protocol
• Selectable wake-up on change of state
• Selectable wetting current (16 or 2.0 mA)
• Eight programmable inputs (switches to supply or ground)
• 14 switch-to-ground inputs
• Typical standby current - VPWR = 100 µA and VDD = 20 µA
• Active interrupt (INT) on change-of-switch state