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MCZ33972AEW/R2 Datasheet(PDF) 1 Page - Freescale Semiconductor, Inc |
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MCZ33972AEW/R2 Datasheet(HTML) 1 Page - Freescale Semiconductor, Inc |
1 / 32 page Freescale Semiconductor, Inc. reserves the right to change the detail specifications, as may be required, to permit improvements in the design of its products. Document Number: MC33972 Rev. 16.0, 10/2009 Freescale Semiconductor Technical Data © Freescale Semiconductor, Inc., 2009. 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 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 5.5 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 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 • Exposed pad packaging designated by suffix code EK 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 MCZ33972EW/R2 MCZ33972AEW/R2 MC33972TDWB/R2 MC33972TEW/R2 MCZ33972TEW/R2 MCZ33972AEK/R2 32 SOICW EP 33972/A/T EK SUFFIX (Pb-FREE) 98ASA10556D 32-PIN SOICW EP VBAT SP0 SP1 SP7 SG0 SG1 SG12 SG13 VPWR VDD WAKE SI CS SO INT AMUX GND MOSI SCLK CS MISO INT AN0 33972 MCU SCLK POWER SUPPLY LVI ENABLE WATCHDOG RESET VDD VBAT VDD VBAT |
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