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MC33972 Datasheet(PDF) 1 Page - Motorola, Inc |
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MC33972 Datasheet(HTML) 1 Page - Motorola, Inc |
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1 / 28 page  Simplified Application Diagram 33972 VBAT VBAT SP0 SP1 SP7 SG0 SG1 SG12 SG13 VPWR VDD AMUX WAKE GND INT SO SI SCLK CS MCU AN0 INT MISO MOSI SCLK CS Power Supply LVI Watchdog Reset Enable VBAT VDD MOTOROLA SEMICONDUCTOR TECHNICAL DATA 33972 Simplified Application Diagram This document contains information on a new product. Specifications and information herein are subject to change without notice. © Motorola, Inc. 2004 Document order number: MC33972 Rev 3.0, 12/2004 33972 Advance Information Multiple Switch Detection Interface with Suppressed Wake-Up 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 on the AMUX output terminal 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 pullup or pulldown 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 5.5 V ≤ VPWR ≤ 26 V • Switch Input Voltage Range -14 V to VPWR, 40 V Max • Interfaces Directly to Microprocessor Using 3.3 V/5.0 V SPI Protocol • Selectable Wake-Up on Change of State • Selectable Wetting Current (16 mA or 2.0 mA) • 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 • Active Interrupt (INT) on Change-of-Switch State • Pb-Free Packaging Designated by Suffix Code EW MULTIPLE SWITCH DETECTION INTERFACE WITH SUPPRESSED WAKE-UP DWB SUFFIX EW (Pb-FREE) SUFFIX CASE 1324-02 32-TERMINAL SOICW ORDERING INFORMATION Device Temperature Range (TA) Package MC33972DWB/R2 -40 °C to 125°C 32 SOICW MC33972EW/R2 Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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