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MC33975EK Scheda tecnica(PDF) 1 Page - Freescale Semiconductor, Inc |
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MC33975EK Scheda tecnica(HTML) 1 Page - Freescale Semiconductor, Inc |
1 / 32 page Document order number: MC33975 Rev 4.0, 08/2005 Freescale Semiconductor Technical Data * This document contains certain information on a new product. Specifications and information herein are subject to change without notice. © Freescale Semiconductor, Inc., 2005. All rights reserved. Multiple Switch Detection Interface with Suppressed Wake-Up and 32mA 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 mA and 4.0 mA for switch-to-ground inputs, and an interrupt bit that can be reset. Features • Designed to Operate 5.5 V ≤ VPWR ≤ 28 V • Switch Input Voltage Range -14 V to VPWR • Interfaces Directly to Microprocessor Using 3.3 V/5.0 V SPI Protocol • Selectable Wake-Up on Change of State • Selectable Wetting Current (32 mA or 4.0 mA 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 Figure 1. 33975 Simplified Application Diagram ORDERING INFORMATION Device Temperature Range (TA) Package MC33975EK/R2 -40°C to 125°C 32 SOICW-EP PC33975AEK/R2 EK Suffix (Pb-Free) 98ARL10543D 32-TERMINAL SOICW EP 33975 33975A MULTIPLE SWITCH DETECTION INTERFACE WITH SUPPRESSED WAKE-UP 33975 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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