33975A Datasheet | Freescale Semiconductor

.. Freescale Semiconductor Technical Data Document order number: MC33975 Rev 4.0, 08/2005 Multiple Switch Detection Interface with Suppressed Wake-Up and 32m A Wetting Current Freescale offers multiple Switch Detection Interface Devices. The 33975 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 33975 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 33975 ideal for automotive and industrial products requiring low sleep state currents. Improvements are a programmable interrupt timer for Sleep mode that can be disabled, switch detection currents of 32 m A and 4.0 m A for switch-to-ground inputs, and an interrupt bit that can be reset. Features 33975 33975A MULTIPLE SWITCH DETECTION INTERFACE WITH SUPPRESSED WAKE-UP EK Suffix (Pb-Free) 98ARL10543D 32-TERMINAL SOICW EP ORDERING INFORMATION Temperature Range (TA) -40°C to 125°C Package - Designed to Operate 5.5 V ≤ VPWR ≤ 28 V Device - Switch Input Voltage Range -14 V to VPWR MC33975EK/R2 - Interfaces Directly to Microprocessor Using 3.3 V/5.0 V SPI Protocol PC33975AEK/R2 - Selectable Wake-Up on Change of State - Selectable Wetting Current (32 m A or 4.0 m A for switch-to-ground inputs) - 8 Programmable Inputs (Switches to Battery or Ground) - 14 Switch-to-Ground Inputs - VPWR Standby Current 100 µA Typical, VDD Standby Current 20 µA Typical - Pb-free 32-terminal suffix EK VDD VBAT VBAT SP0 SP1 VBAT SP7 Power Supply LVI Enable VDD VDD Watchdog Reset 32 SOICW-EP VPWR WAKE SI...