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MC33972 Scheda tecnica(PDF) 1 Page - Freescale Semiconductor, Inc |
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MC33972 Scheda tecnica(HTML) 1 Page - Freescale Semiconductor, Inc |
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1 / 28 page  Document Number: MC33972 Rev. 9.0, 4/2007 Freescale Semiconductor Advance Information * This document contains certain information on a new product. Specifications and information herein are subject to change without notice. © Freescale Semiconductor, Inc., 2007. All rights reserved. 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 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 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 MPU 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 • Typical Standby Current - VPWR = 100 µA and VDD = 20 µA • Active Interrupt (INT) on Change-of-Switch State • Pb-Free Packaging Designated by Suffix Code EW Figure 1. 33972 Simplified Application Diagram MULTIPLE SWITCH DETECTION INTERFACE DWB SUFFIX EW SUFFIX (Pb-FREE) 98ARH99137A 32-PIN SOICW ORDERING INFORMATION Device Temperature Range (TA) Package MC33972DWB/R2 -40°C to 125°C 32 SOICW MC33972EW/R2 MCZ33972AEW/R2 33972A 33972 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 VDD |
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