Datasheet L6515 Datasheet (SGS Thomson Microelectronics)

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L6515
DUAL DC-MOTOR POSITIONING SYSTEM
ADVANCE DATA
PRECISE OPERATION ALSO WITH LOW COST OPTICALENCODER
PWM - OUTPUT FOR DIGITAL SWITCHED POWERBRIDGES
DIRECTION INDICATOR FOR EASY POSI­TIONCOUNTING WITH µP
EXTERNAL LOOP GAIN AND TRANSFER FUNCTIONALADJUSTMENT
PARALLEL ADDRESSED INPUTS WITH LATCH
44 LEAD PLCC PACKAGE
DESCRIPTION
The L6515 is a monolithic integrated circuit in BCD-Technologyassembledina PLCC-44plastic chipcarrier.
The device contains all functions for a complete dual DC-Motor positioning system. For the motor driver stage only digital switched bridges are needed.
Useful are L293E, L298, L6203 and L6202. The device is intended to drive DC-Motors in typewrit­ers, printers, plotters and general purpose indus­trialapplications.
This isadvanced information on anew product now in development or undergoing evaluation. Details are subject tochange without notice.
May 1994
SYSTEM BLOCK DIAGRAM (ONECHANNEL)
PLCC44
ORDERING NUMBER: L6515
MULTIPOWERBCD TECHNOLOGY
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SYSTEM DESCRIPTION
The L6515 is intended to be used as a microproc­essorcontrolledpositioningsystem.
For the motor driver stage only digital operating bridgesareneededl ikeL293E,L298,L6203,L6202.
The system operates in two modes to achieve high-speed,high-accurancy positioning.
Speed commands for the system originate in the microprocessor. It is continuouslyupdated on the motor position by means of pulses from the con­troller chip, which in turn gets its information from the encoder. From this basic input, the microproc­essor computes a 6-bit control word that sets the systemspeed anddirectiondependenton the dis­tance to travel.
When the motor is stopped and the microproces­sor orders it to a new position, the system oper-
ates initially in an open-loop configuration as there is no feedback from the tachometer gener­ator.Therefore maximumcurrentis fed to themo­tor. As maximum speed is reached, the tachome­ter chip output backs off the processors signal thus reducing acceleratingtorque.Themotor con­tinues to run at top speed but under closed-loop control.
As a target position is approached,the microproc­essor lowers the value of the speed-demand word; this reduces the voltage at the main sum­ming point, in effect braking the motor. The brak­ing is appliedprogressively until the motor is run­ning at minimum speed.
At that time, the microprocessor orders a switch to the position mode, and within 3 to 4ms the power stage drives the motor to a null position, whereit is held by electronic ”detening”.
Symbol Parameter Value Unit
V
S
Supply Voltage 12 V
V
IA
Analog Inputs Voltage -0.3 to 7 V
V
IL
Logic Inputs Voltage -0.3 to 7 V
V
O
Open Collector Output Current 12 V
I
O
Open Collector Current 10 mA
I
Z
Zener Current 20 mA
T
stg
, Tj Storage Temperature -40to 150 °C
T
amb
Operative Ambient Temperature 0 to 70 °C
ABSOLUTE MAXIMUMRATINGS
PIN CONNECTION (top view)
LAI
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Pin Name Description
1 LCSG Load Current Decoder Sens Reference Ground 2V
Z
Zener Clamp
3,43 LCDI Load Current Decoder Input 4,42 LCDO Load Current Decoder Output
5,41 EAO Error AmplifierOutput for Current Mode PWM Modulator 6,40 EAI Error Amplifier Input for Current Mode PWM Modulator
7,39 TSO Tacho Signal Output 8,38 TSPO Tacho SignalProcessor Output
9,37 TSPI Tacho Signal Processor Input 10,36 PWMN Current Mode PWM Output Inverted
11,35 PWM Current Mode PWM Output non Inverted 12,34 DIO Direction Indicator Digital Open Collector Output. A Low Level is cw,
A High Level is ccw Operation ofthe Motor
13,33 PCO Position Counter Digital Open Collector Output
14,32 PSO Phase Selector Output for Signal Differentation
15,31 POSO Positioning Output. The Output Becomes Activated via Position
Adress Decoder.
16,30 FTB Analog Input from PositionEncoder Phase B. Proposed Operation
Range is 2.8V + 1V.
17,29 FTA Analog Input from PositionEncoder Phase A. Proposed Operation
Range is 2.8V + 1V
18 REF Master Current Reference
19 OSC Oscillator
20,21 DAI Decoder Logic Input for Latch Select + Reset
22 GND Major and Logic Ground
23 to 28 LAI Latch Adress Input
44 V
S
Supply Voltage
PIN FUNCTIONS
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SCHEMATICDIAGRAM
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APPLICATIONCIRCUIT
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Symbol Parameter Pin Test Condition Min. Typ. Max. Unit
V
S
Operating Supply VoltageRange 7 11 V
I
S
Quiescent supply current 50 mA
V
Z
Zener Voltage Iz=1mA 8,5 9.9 11,4 V
I
Z
Operating Zener Current 1 mA
ELECTRICAL CHARACTERISTICS (refer to test circuit, VS=10V, I
REF
=300µA, T
amb
=25 °C unless
otherwisespecified)
V
I
Operating Input Voltage Range A/D/1/2 referredto V
REF
-1,65 +1,65 V
I
I
Input Bias Current 1 µA
V
OS
INput-output Offset Voltage Between A/D/1/2 and F/1/2
S3 or S4
closed
I
o
=0
±15 mV
S1 or S2
closed
I
o
=0
V
IN=VREF
±20 mV
V
SAT
Output Saturation Voltage B/C/1/2 Io=1.4mA 0.4 V
I
OH
Output Leakage Current 10 µA
V
TH
ThresholdHysteresis voltageBetween A/1/2 and B/1/2 D/1/2 and C/1/2
80 150 mV
R
ON
Output Resistance ON State E/F/1/2 One of S1 to
S6 closed
150 300
V
OL
Output Operating Low Voltage E/F/1/2 referred
to V
REF
IO=1mA
-1.2 V
V
OH
OutpUt Operating High Voltage +1.2 V
POSITIONENCODER SECTION
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Symbol Parameter Pin Test Condition Min. Typ. Max. Unit
V
I
Input Voltage G/1/2 gain=1
referred
to V
REF
-1.65 +1.65 V
I
I
Input Bias Current 1 µA
V
OL
Output Operating Low Voltage H/1/2 referred to V
REF
-1.62
V
I/1/2
Io=1mAS7closed
-1.3
V
OH
Output Operating low Voltage
I/1/2 +1.3
H/1/2 +1.62
R
ON
Output Resistance On State
I1/2 S7 or S7
closed
150 260
V
OS
Input Offset Voltage H1/2 VIN=V
REF
S7 closed
I
o
=0
±20 mV
V
OS
Input Offset Voltage G1/2 referred to V
REF
g1/2 shorted
to H1/2
±20 mV
R
MO
Output Matching Resistance
I1/2 S7 or S7
closed
0.8 1.2
TACHOSIGNALPROCESSINGSECTION
V
I
Input Voltage J1/2 gain=1 1 4.6 V
I
I
Input Bias Current 1 µA
V
O
L Lower Clamping Voltage K1/2 Io=1ma
refered to V
REF
-1.45 -1.22 V
V
OH
Higher Clamping Voltage +1.06 +1.56 V
V
OS
Input Offset Voltage J1/2 referred to V
REF
K1/2 J1/2 shorted
±20 mV
ERRORAMPLIFIERSECTION
V
OS
Output Offset Voltage L1/2 N1/2=0
referred to V
REF
±140 mV
R
OUT
Output Resistance 0.5 1.7 K
V
CLH
Current Limit Threshold O1/2
P1/2
referred to V
REF
±0.5 V
V
CDO
Differential Output Offset Voltage L1/2 V
off(+)-Voff(-)
±20 mV
CURRENT DECODERSECTION
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Symbol Parameter Pin Test Condition Min. Typ. Max. Unit
V
H
Upper Triangle Threshold Referred to V
REF
+1.2 +1.8 V
V
L
Lower Triangle Threshold -1.6 -1.3 V
I
CD
Charge/Discharge Current I
REF
=500µA ±160 ±180 µA
V
O
PWM Output Voltage O1/2 Io=1.4mA 0.4 V
P1/2 2.7
OSCILLATOR-PWM SECTIONS
I
REF
Current Reference Input Range Z 0.3 0.7 mA
I
O
Sink and Source Output Current J1/2 I
REF
=0.5 mA 918 968 1018 µA
V
REF
Reference Voltage Z I
REF
=20 µa 2.7 2.8 2.9 V
I
O
LinearityError J1/2 I
REF
=0.5 mA 1.61 /FS
DACSECTION
V
INL
Input lOw Voltage R
S
-0.3 0.8 V
V
INH
Input High Voltage T
U
27V
I
L
Input V
W
-10 µA
I
H
Input High Current High Voltage X
Y
30 µA
INPUTLOGIC SECTION
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TRUTH TABLETACHO-ENCODER LOGIC
PDIB > PDIA C 1 = HIGH PDIB < PDIA C 1 = LOW PDIB > PDIA C2 = HIGH PDIB < PDIA C2 = LOW
INPUTSIGNAL
C1 C2 CLOSED S2 POSITION
L H S1 TSPO H H S2 TSPO H L S3 TSPO
L L S4 TSPO
SWITCHSIGNAL
APPLICATIONCIRCUIT
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TRUTH TABLELOGICSELECTION CHIP ADDRESS
Terminals
Functions
RS
L L NO ACTION
H L STROBE LATCH 1
L H STROBE LATCH 2
H H RESET LATCH 1/2
DECODER ADDRESS
LATCH ADDRESS
TIMING DIAGRAM OF COUNTER AND DIRECTIONINDICATION LOGIC
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POSITIONENCODER
Main advantage of the operation principle of the positioningsystem is that a high performancepo­sitionencoder is not required.
The system accepts several phases and ampli­tude errors of the encoder output signal without affectingthe systemperformance. Two positionsensorsare useful.
1) Optical-Encoderwith IR-LED and Phototransistor
2) Magnetic Encoder with hall-effect sensors
The allowedspreadof theencoderoutput signal refer to referencelevel is shown in Fig.3.
Figure3.
Figure2.
Figure1.
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PLCC44PACKAGE MECHANICAL DATA
DIM.
mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A 17.4 17.65 0.685 0.695 B 16.51 16.65 0.650 0.656 C 3.65 3.7 0.144 0.146
D 4.2 4.57 0.165 0.180 d1 2.59 2.74 0.102 0.108 d2 0.68 0.027
E 14.99 16 0.590 0.630
e 1.27 0.050 e3 12.7 0.500
F 0.46 0.018 F1 0.71 0.028
G 0.101 0.004 M 1.16 0.046
M1 1.14 0.045
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Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement ofpatents or other rights of third parties whichmay result from itsuse. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications men­tioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without ex­press writtenapproval of SGS-THOMSON Microelectronics.
1994 SGS-THOMSON Microelectronics - All RightsReserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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