Details, datasheet, quote on part number: MC33794DWB
PartMC33794DWB
CategorySensors
DescriptionElectric Field Imaging Device
CompanyMotorola Semiconductor Products
DatasheetDownload MC33794DWB datasheet
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Features, Applications

Product Preview Electric Field Imaging Device

The 33794 is intended for applications where noncontact sensing of objects is desired. When connected to external electrodes, an electric field is created. The 33794 is intended for use in detecting objects in this electric field. The IC generates a low-frequency sine wave. The frequency is adjustable by using an external resistor and is optimized for 120 kHz. The sine wave has very low harmonic content to reduce harmonic interference. The 33794 also contains support circuits for a microcontroller unit (MCU) to allow the construction of a two-chip E-field system. Features Supports to 9 Electrodes and 2 References Shield Driver for Driving Remote Electrodes Through Coaxial Cables +5.0 V Regulator to Power External Circuit ISO-9141 Physical Layer Interface Lamp Driver Output Watchdog and Power ON Reset Timer Critical Internal Nodes Scaled and Selectable for Measurement High-Purity Sine Wave Generator Tunable with External Resistor

Device MC33794DH/R2 MC33794DWB/R2 Temperature Range (TA) to 85C Package 44 HSOP 54 SOICW-EP

LAMP_OUT LP_CAP VCC LEVEL VDD VDD_MON PWR_MON LAMP_MON ISO-9141 LAMP_SENSE ISO_IN ISO_OUT WD_IN REF_A RST REF_B LAMP_CTRL LAMP_GND TEST E1 E2 SIGNAL

This document contains certain information on a new product. Specifications and information herein are subject to change without notice. Motorola, Inc. 2003

CONTROL LOGIC 22 k (Nominal) OSC MUX OUT CLK R_OSC 39 k DIS_SHIELD SHIELD 47 k MUX IN RECT LP_CAP 10 nF GAIN AND OFFSET POR/ WD VCC REG VDD REG LEVEL ATTN SIGNAL LAMP_SENSE LAMP_MON

MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
VCC NC AGND SHIELD NC GND TEST E8 E9 REF_A REF_B ISO_OUT ISO_IN ISO-9141 LAMP_OUT

VPWR NC VDD VDD_MON CLK R_OSC LP_CAP PWR_MON LEVEL SIGNAL DIS_SHIELD LAMP_MON LAMP_SENSE NC LAMP_CTRL LAMP_GND WD_IN RST

Pin Name VCC NC AGND Formal Name 5.0 V Regulator Output No connect Analog Ground Definition This output pin requires 47 F capacitor and provides a regulated 5.0 V for the MCU and for internal needs of the 33794. These pins may be used at some future date and should be left open. This pin is connected to the ground return of the analog circuitry. This ground should be kept free of transient electrical noise like that from logic switching. Its path to the electrical current return point should be kept separate from the return for GND. This pin connects to cable shields to cancel cable capacitance. This pin and metal backing is the IC power return and thermal radiator/conductor. This pin is normally connected to circuit ground. There are special operating modes associated with this pin when it is not at ground. These are the electrode pins. They are connected either directly or through coaxial cables to the electrodes for measurements. One of these electrodes can be selected at a time for capacitance measurement. All of the other unselected electrodes are grounded by an internal switch. The signal at the selected electrode pin is routed to the shield driver amplifier by an internal switch. All of the coaxial cable shields should be isolated from ground and connected SHIELD. These pins can be individually selected like E1 through E9. Unlike E1 through E9, these pins are not grounded when not selected. The purpose of these pins is to allow known capacitors to be measured. By using capacitors at the low and high end of the expected range, absolute values for the capacitance on the electrodes can be computed. This pin translates ISO-9141 receive levels 5.0 V logic levels for the MCU. This pin accepts data from the MCU to be sent over the ISO-9141 communications interface. It translates the 5.0 V logic levels from the MCU to transmit levels on the ISO-9141 bus.

Shield Driver Ground Test Mode Control Electrode Connections

 

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