|Description||Multi SW Detect Interface W/suppressed Wake-up|
|Company||Motorola Semiconductor Products|
|Datasheet||Download MC33972 datasheet
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 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.MULTIPLE SWITCH DETECTION INTERFACE WITH SUPPRESSED WAKE-UP
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 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. Note The 33972 is similar to the 33993 device, with the exception that the programmable interrupt timer for the 33972's Sleep mode can be disabled (refer to the section entitled Sleep Mode on page 18).Features
Designed to Operate 5.5 V VPWR 26 V Switch Input Voltage Range V to VPWR, 40 V Max Interfaces Directly to Microprocessor Using V/5.0 V SPI Protocol Selectable Wake-Up on Change of State Selectable Wetting Current 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 StateDevice MC33972DWB/R2 Temperature Range (TA) to 125°C Package 32 SOICW
VPWR VDD WAKE SI SCLK CS SO INT AMUX Enable Watchdog Reset
This document contains information on a new product. Specifications and information herein are subject to change without notice. © Motorola, Inc. 2003
5.0 V VPWR V SPI Ref mA Comparator mA SP0 VPWR VPWR, VDD, 5.0 V POR Bandgap Sleep PWR VPWR VDD GND
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA For More Information On This Product, Go to: www.freescale.com
Pin Name GND SI SCLK SG06, SG137 VPWR WAKE INT AMUX VDD SO Formal Name Ground SPI Slave In Serial Clock Chip Select Programmable Switches 07 Switch-to-Ground Inputs 013 Battery Input Wake-Up Interrupt Analog Multiplex Output Voltage Drain Supply SPI Slave Out Description Ground for logic, analog, and switch to battery inputs. SPI control data input pin from MCU to 33972. SPI control clock input pin. SPI control chip select input pin from MCU to 33972. Logic 0 allows data to be transferred in. Programmable switch-to-battery or switch-to-ground input pins. Switch-to-ground input pins. Battery supply input pin. Pin requires external reverse battery protection. Open drain wake-up output. Designed to control a power supply enable pin. Open-drain output to MCU. Used to indicate input switch change of state. Analog multiplex output. 3.3/5.0 V supply. Sets SPI communication level for SO driver. Provides digital data from 33972 to MCU.MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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