NXP MC33972DWB

Мониторинг коммутаторовПоследовательный интерфейс SPI3,1 В ~ 5,25 ВПоверхностный монтаж

Overview

The 33972 Multiple Switch Detection Interface 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 microprocessor unit (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 onthe AMUX output pin for the MCU to read. The 33972 device has two modes of operation, Normal and Sleep. Normal Mode allows programming of the device and supplies switch contacts with pull-up or pull-down current as it monitors switch change of state. The Sleep Mode provides low quiescent current, which makes the 33972 ideal for automotive and industrial products requiring low sleep-state currents. Features • Designed to operate 5.5V ≤ VPWR ≤ 26V  • Switch input voltage range -14V to VPWR, 40V Max • Interfaces directly to MPU using 3.3V/5.0V SPI protocol • Selectable wake-up on change of state • Selectable wetting current (16mA or 2.0mA) • 8 programmable inputs (switches to battery or ground) • 14 switch-to-ground inputs  • Typical standby current - VPWR = 100μA and VDD = 20μA  • Active interrupt (INT) on change-of-switch state • Pb-free packaging designated by suffix code EW • Exposed pad packaging designated by suffix code EK

Features

Applications

• Medical/Industrial
• Imaging
• Ultrasound
• Audio and video switching
• Automatic test equipment
• Precision data acquisition
• Battery-powered systems
• Sample-and-hold systems
• Communication systems
• Data Acquisition Systems