Browse Prior Art Database

DUAL FUNCTION PIN FOR ANALOG INTEGRATED CIRCUITS

IP.com Disclosure Number: IPCOM000006687D
Original Publication Date: 1992-Dec-01
Included in the Prior Art Database: 2002-Jan-23
Document File: 2 page(s) / 97K

Publishing Venue

Motorola

Related People

Francois Lhermite: AUTHOR [+2]

Abstract

The purpose of this invention is to include an extra control IC. The part of the IC using this function is function on an integrated circuit where all pins have been depicted on Figure 1. used. It has been developed for a washing machine motor r ---a-------------- l Analog Qf=!$&j Digital signa, i STALL ROTOR ALARM MONlTORlNG l-l I UNIVERSAL MOTOR CONTROL IC - BLOCK DIAGRAM Figure 1 The basic idea consists in cumulating two diierent logic level: zero for the 2 to 7 volt range and one for the informations on the same pin: an analog voltage and a 8 to I3 volt range (considering that Vcc = 1 5V see digital signal. Figure 3).

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MOTOROLA INC. Technical Developments Volume 17 December 1992

DUAL FUNCTION PIN FOR ANALOG INTEGRATED CIRCUITS

by Francois Lhermite and Patrick Rousset

PURPOSE OF THE INVENTION

  The purpose of this invention is to include an extra control IC. The part of the IC using this function is function on an integrated circuit where all pins have been depicted on Figure 1.
used. It has been developed for a washing machine motor

r ---a--------------

l

Analog Qf=!$&j

Digital signa,

i

STALL ROTOR

ALARM MONlTORlNG

l-l

I UNIVERSAL MOTOR CONTROL IC - -------------------

BLOCK DIAGRAM

Figure 1

  The basic idea consists in cumulating two diierent logic level: zero for the 2 to 7 volt range and one for the informations on the same pin: an analog voltage and a 8 to I3 volt range (considering that Vcc = 1 5V see digital signal. Figure 3).

  The input signal is built by a resistor divider. The Both five volts (upper and lower) ranges determine invention consists in splitting the input voltage span in a unique analog information span on the analog output two equal ranges. Each range corresponds to the desired (see Figure 4).

DEVICE DESCRIPTION ------------------- l i ivcc

I

1

A I',& #A

I

___------------------

Digital output

Device description

Figure 2

0 Motorola. 1°C. ,992 105

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MOTOROLA INC. Technical Developments Volume 17 December 1992

                                  If this voltage is set in the lower input range the The Vin voltage is intended to be a static voltage f...