|Category||Power Management => Power Monitoring => Contact Monitor|
|Company||Motorola Semiconductor Products|
|Datasheet||Download MC33993DWB datasheet
Advance Information Multiple Switch Detection Interface
The 33993 Multiple Switch Detection Interface 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. The 33993 device has two modes of operation, Sleep and Normal. The Sleep mode provides low quiescent current and enables the wake-up features of the device. 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 33993 is packaged in the 32-pin wide-body SOIC, reducing circuit board area. Low quiescent current makes the 33993 ideal for automotive and industrial products requiring low sleep state currents. The internal block diagram of the 33993 is illustrated in Figure 1, page 2.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 MC33993DWB/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 certain information on a new product. Specifications and information herein are subject to change without notice. © Motorola, Inc. 2003MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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 33993. SPI control clock input pin. SPI control chip select input pin from MCU to 33993. 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 33993 to MCU.
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