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L6515
DUAL DC-MOTOR POSITIONING SYSTEM
ADVANCE DATA
PRECISE OPERATION ALSO WITH LOW COST OPTICAL ENCODER PWM - OUTPUT FOR DIGITAL SWITCHED POWER BRIDGES DIRECTION INDICATOR FOR EASY POSITION COUNTING WITH P EXTERNAL LOOP GAIN AND TRANSFER FUNCTIONAL ADJUSTMENT PARALLEL LATCH ADDRESSED INPUTS WITH
MULTIPOWER BCD TECHNOLOGY
PLCC44 ORDERING NUMBER: L6515
44 LEAD PLCC PACKAGE DESCRIPTION The L6515 is a monolithic integrated circuit in BCD-Technology assembled in a PLCC-44 plastic chip carrier. The device contains all functions for a complete dual DC-Motor positioning system. For the motor driver stage only digital switched bridges are needed. SYSTEM BLOCK DIAGRAM (ONE CHANNEL)
Useful are L293E, L298, L6203 and L6202. The device is intended to drive DC-Motors in typewriters, printers, plotters and general purpose industrial applications.
May 1994
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This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
L6515
ABSOLUTE MAXIMUM RATINGS
Symbol VS VIA VIL VO IO IZ Tstg, Tj Tamb Supply Voltage Analog Inputs Voltage Logic Inputs Voltage Open Collector Output Current Open Collector Current Zener Current Storage Temperature Operative Ambient Temperature Parameter Value 12 -0.3 to 7 -0.3 to 7 12 10 20 -40 to 150 0 to 70 Unit V V V V mA mA C C
PIN CONNECTION (top view)
LAI
SYSTEM DESCRIPTION The L6515 is intended to be used as a microprocessor controlled positioning system. For the motor driver stage only digital operating bridges are needed like L293E, 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 continuously updated 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 system speed and direction dependent on the distance to travel. When the motor is stopped and the microprocessor orders it to a new position, the system oper2/13
ates initially in an open-loop configuration as there is no feedback from the tachometer generator. Therefore maximum current is fed to the motor. As maximum speed is reached, the tachometer chip output backs off the processors signal thus reducing accelerating torque. The motor 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 applied progressively 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, where it is held by electronic "detening".
L6515
PIN FUNCTIONS
Pin 1 2 3,43 4,42 5,41 6,40 7,39 8,38 9,37 10,36 11,35 12,34 Name LCSG VZ LCDI LCDO EAO EAI TSO TSPO TSPI PWMN PWM DIO Description Load Current Decoder Sens Reference Ground Zener Clamp Load Current Decoder Input Load Current Decoder Output Error Amplifier Output for Current Mode PWM Modulator Error Amplifier Input for Current Mode PWM Modulator Tacho Signal Output Tacho Signal Processor Output Tacho Signal Processor Input Current Mode PWM Output Inverted Current Mode PWM Output non Inverted Direction Indicator Digital Open Collector Output. A Low Level is cw, A High Level is ccw Operation of the Motor Position Counter Digital Open Collector Output Phase Selector Output for Signal Differentation Positioning Output. The Output Becomes Activated via Position Adress Decoder. Analog Input from Position Encoder Phase B. Proposed Operation Range is 2.8V + 1V. Analog Input from Position Encoder Phase A. Proposed Operation Range is 2.8V + 1V Master Current Reference Oscillator Decoder Logic Input for Latch Select + Reset Major and Logic Ground Latch Adress Input Supply Voltage
13,33 14,32 15,31
PCO PSO POSO
16,30
FTB
17,29
FTA
18 19 20,21 22 23 to 28 44
REF OSC DAI GND LAI VS
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L6515
SCHEMATIC DIAGRAM
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L6515
APPLICATION CIRCUIT
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L6515
ELECTRICAL CHARACTERISTICS (refer to test circuit, VS=10V, IREF=300A, Tamb=25 C unless otherwise specified)
Symbol VS IS VZ IZ Parameter Operating Supply Voltage Range Quiescent supply current Zener Voltage Operating Zener Current Iz=1mA 8,5 1 9.9 Pin Test Condition Min. 7 Typ. Max. 11 50 11,4 Unit V mA V mA
POSITION ENCODER SECTION
VI II VOS Operating Input Voltage Range Input Bias Current INput-output Offset Voltage Between A/D/1/2 and F/1/2 S3 or S4 closed Io=0 S1 or S2 closed Io=0 VIN =VREF VSAT IOH VTH Output Saturation Voltage Output Leakage Current Threshold Hysteresis voltage Between A/1/2 and B/1/2 D/1/2 and C/1/2 Output Resistance ON State Output Operating Low Voltage E/F/1/2 E/F/1/2 One of S1 to S6 closed referred to VREF IO=1mA +1.2 80 B/C/1/2 Io=1.4mA A/D/1/2 referred to VREF -1,65 +1,65 1 15 V A mV
20
mV
0.4 10 150
V A mV
RON VOL
150
300 -1.2
V
VOH
OutpUt Operating High Voltage
V
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L6515
TACHO SIGNAL PROCESSING SECTION
Symbol VI Parameter Input Voltage Pin G/1/2 Test Condition gain=1 referred to VREF Min. -1.65 Typ. Max. +1.65 Unit V
II VOL
Input Bias Current Output Operating Low Voltage H/1/2 I/1/2 Io=1mA referred to VREF S7 closed +1.3 +1.62 S7 or S7 closed VIN=VREF S7 closed Io = 0 referred to VREF g1/2 shorted to H1/2 S7 or S7 closed 0.8 150
1 -1.62 -1.3
A
V
VOH
Output Operating low Voltage Output Resistance On State Input Offset Voltage
I/1/2 H/1/2
RON VOS
I1/2 H1/2
260 20
mV
VOS
Input Offset Voltage
G1/2
20
mV
R MO
Output Matching Resistance
I1/2
1.2
ERROR AMPLIFIER SECTION
VI II VOL VOH VOS Input Voltage Input Bias Current Lower Clamping Voltage Higher Clamping Voltage Input Offset Voltage J1/2 K1/2 Io=1ma refered to VREF referred to VREF K1/2 J1/2 shorted -1.45 +1.06 J1/2 gain=1 1 4.6 1 -1.22 +1.56 20 V A V V mV
CURRENT DECODER SECTION
VOS R OUT VCLH VCDO Output Offset Voltage Output Resistance Current Limit Threshold Differential Output Offset Voltage O1/2 P1/2 L1/2 referred to VREF Voff(+) - Voff(-) L1/2 N1/2=0 referred to VREF 0.5 0.5 20 140 1.7 mV K V mV
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L6515
OSCILLATOR -PWM SECTIONS
Symbol VH VL ICD VO Parameter Upper Triangle Threshold Lower Triangle Threshold Charge/Discharge Current PWM Output Voltage O1/2 P1/2 IREF=500A Io=1.4mA 2.7 Pin Test Condition Referred to VREF Min. +1.2 -1.6 160 Typ. Max. +1.8 -1.3 180 0.4 Unit V V A V
DAC SECTION
IREF IO VREF IO Current Reference Input Range Sink and Source Output Current Reference Voltage Linearity Error Z J1/2 Z J1/2 IREF=0.5 mA IREF=20 a IREF=0.5 mA 0.3 918 2.7 968 2.8 0.7 1018 2.9 1.61 mA A V /FS
INPUT LOGIC SECTION
VINL VINH IL IH Input lOw Voltage Input High Voltage Input Input High Current High Voltage R S T U V W X Y -0.3 2 0.8 7 -10 30 V V A A
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L6515
APPLICATION CIRCUIT
TRUTH TABLE TACHO-ENCODER LOGIC INPUT SIGNAL
PDIB > PDIA PDIB < PDIA PDIB > PDIA PDIB < PDIA C 1 = HIGH C 1 = LOW C2 = HIGH C2 = LOW
SWITCH SIGNAL
C1 L H H L C2 H H L L CLOSED S1 S2 S3 S4 S2 POSITION TSPO TSPO TSPO TSPO
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L6515
TRUTH TABLE LOGIC SELECTION CHIP ADDRESS DECODER ADDRESS
Terminals R L H L H S L L H H NO ACTION STROBE LATCH 1 STROBE LATCH 2 RESET LATCH 1/2 Functions
LATCH ADDRESS
TIMING DIAGRAM OF COUNTER AND DIRECTION INDICATION LOGIC
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L6515
POSITION ENCODER Main advantage of the operation principle of the positioning system is that a high performance position encoder is not required. 1) Optical-Encoder with IR-LED and Phototransistor Figure 1. The system accepts several phases and amplitude errors of the encoder output signal without affecting the system performance. Two position sensors are useful.
2) Magnetic Encoder with hall-effect sensors Figure 2.
The allowed spread of the encoder output signal refer to reference level is shown in Fig.3. Figure 3.
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L6515
PLCC44 PACKAGE MECHANICAL DATA
DIM. MIN. A B C D d1 d2 E e e3 F F1 G M M1 1.16 1.14 14.99 1.27 12.7 0.46 0.71 0.101 0.046 0.045 17.4 16.51 3.65 4.2 2.59 0.68 16 0.590 0.050 0.500 0.018 0.028 0.004 mm TYP. MAX. 17.65 16.65 3.7 4.57 2.74 MIN. 0.685 0.650 0.144 0.165 0.102 0.027 0.630 inch TYP. MAX. 0.695 0.656 0.146 0.180 0.108
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L6515
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 of patents or other rights of third parties which may result from its use. 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 written approval of SGS-THOMSON Microelectronics. (c) 1994 SGS-THOMSON Microelectronics - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands - Singapore Spain - Sweden - Switzerland - Taiwan - Thaliand - United Kingdom - U.S.A.
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