STMICROELECTRONICS L6515

L6515
DUAL DC-MOTOR POSITIONING SYSTEM
ADVANCE DATA
PRECISE OPERATION ALSO WITH LOW
COST OPTICAL ENCODER
MULTIPOWER BCD TECHNOLOGY
PWM - OUTPUT FOR DIGITAL SWITCHED
POWER BRIDGES
DIRECTION INDICATOR FOR EASY POSITION COUNTING WITH µP
EXTERNAL LOOP GAIN AND TRANSFER
FUNCTIONAL ADJUSTMENT
PARALLEL
LATCH
ADDRESSED
INPUTS
WITH
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.
PLCC44
ORDERING NUMBER: L6515
Useful are L293E, L298, L6203 and L6202. The
device is intended to drive DC-Motors in typewriters, printers, plotters and general purpose industrial applications.
SYSTEM BLOCK DIAGRAM (ONE CHANNEL)
May 1994
1/13
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
Parameter
Value
Unit
12
V
VS
Supply Voltage
VIA
Analog Inputs Voltage
-0.3 to 7
V
VIL
Logic Inputs Voltage
-0.3 to 7
V
VO
Open Collector Output Current
12
V
IO
Open Collector Current
10
mA
IZ
Zener Current
20
mA
-40 to 150
°C
0 to 70
°C
Tstg, Tj
Tamb
Storage Temperature
Operative Ambient Temperature
LAI
PIN CONNECTION (top view)
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
Name
Description
1
LCSG
2
VZ
3,43
LCDI
Load Current Decoder Input
4,42
LCDO
Load Current Decoder Output
5,41
EAO
Error Amplifier Output 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 Signal Processor Output
9,37
TSPI
Tacho Signal Processor Input
10,36
PWMN
11,35
PWM
12,34
DIO
Direction Indicator Digital Open Collector Output. A Low Level is cw,
A High Level is ccw Operation of the Motor
13,33
PCO
Position Counter Digital Open Collector Output
14,32
PSO
Phase Selector Output for Signal Differentation
15,31
POSO
16,30
FTB
Analog Input from Position Encoder Phase B. Proposed Operation
Range is 2.8V + 1V.
17,29
FTA
Analog Input from Position Encoder 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
VS
Supply Voltage
Load Current Decoder Sens Reference Ground
Zener Clamp
Current Mode PWM Output Inverted
Current Mode PWM Output non Inverted
Positioning Output. The Output Becomes Activated via Position
Adress Decoder.
3/13
L6515
SCHEMATIC DIAGRAM
4/13
L6515
APPLICATION CIRCUIT
5/13
L6515
ELECTRICAL CHARACTERISTICS (refer to test circuit, VS=10V, IREF=300µA, Tamb=25 °C unless
otherwise specified)
Symbol
Parameter
VS
Operating Supply Voltage Range
IS
Quiescent supply current
VZ
Zener Voltage
IZ
Operating Zener Current
Pin
Test Condition
Min.
Typ.
7
Iz=1mA
8,5
9.9
Max.
Unit
11
V
50
mA
11,4
V
1
mA
POSITION ENCODER SECTION
VI
Operating Input Voltage Range
II
Input Bias Current
VOS
VSAT
A/D/1/2
INput-output Offset Voltage Between
A/D/1/2 and F/1/2
Output Saturation Voltage
B/C/1/2
referred to VREF
+1,65
V
1
µA
S3 or S4
closed
Io=0
±15
mV
S1 or S2
closed
Io=0
VIN =VREF
±20
mV
Io=1.4mA
0.4
V
10
µA
150
mV
300
Ω
-1.2
V
IOH
Output Leakage Current
VTH
Threshold Hysteresis
voltage Between
A/1/2 and B/1/2
D/1/2 and C/1/2
RON
Output Resistance ON State
E/F/1/2
One of S1 to
S6 closed
VOL
Output Operating Low Voltage
E/F/1/2
referred
to VREF
IO=1mA
VOH
OutpUt Operating High Voltage
6/13
-1,65
80
150
+1.2
V
L6515
TACHO SIGNAL PROCESSING SECTION
Symbol
Parameter
VI
Input Voltage
II
Input Bias Current
VOL
Output Operating Low Voltage
Pin
Test Condition
Min.
G/1/2
gain=1
referred
to VREF
-1.65
H/1/2
referred to VREF
I/1/2
Io=1mA
VOH
Output Operating
low Voltage
Typ.
Max.
Unit
+1.65
V
1
µA
-1.62
S7
closed
-1.3
V
I/1/2
+1.3
H/1/2
+1.62
260
Ω
VIN=VREF
S7 closed
Io = 0
±20
mV
G1/2
referred to VREF
g1/2 shorted
to H1/2
±20
mV
I1/2
S7 or S7
closed
0.8
1.2
Ω
J1/2
gain=1
1
4.6
V
1
µA
RON
Output Resistance
On State
I1/2
S7 or S7
closed
VOS
Input Offset Voltage
H1/2
VOS
Input Offset Voltage
R MO
Output Matching
Resistance
150
ERROR AMPLIFIER SECTION
VI
Input Voltage
II
Input Bias Current
VOL
Lower Clamping Voltage
VOH
Higher Clamping Voltage
VOS
Input Offset Voltage
K1/2
Io=1ma
-1.45
-1.22
V
refered to VREF
+1.06
+1.56
V
J1/2
referred to VREF
K1/2 J1/2 shorted
±20
mV
L1/2
N1/2=0
referred to VREF
±140
mV
1.7
KΩ
CURRENT DECODER SECTION
VOS
Output Offset Voltage
R OUT
Output Resistance
VCLH
Current Limit Threshold
O1/2
P1/2
referred to VREF
VCDO
Differential Output Offset Voltage
L1/2
Voff(+) - Voff(-)
0.5
±0.5
V
±20
mV
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L6515
OSCILLATOR -PWM SECTIONS
Symbol
Parameter
VH
Upper Triangle Threshold
VL
Lower Triangle Threshold
ICD
Charge/Discharge Current
VO
PWM Output Voltage
Pin
Test Condition
Min.
Referred to VREF
IREF=500µA
O1/2
Typ.
Max.
Unit
+1.2
+1.8
V
-1.6
-1.3
V
±160
±180
µA
0.4
V
0.7
mA
Io=1.4mA
P1/2
2.7
0.3
DAC SECTION
IREF
Current Reference Input Range
Z
IO
Sink and Source Output Current
J1/2
IREF=0.5 mA
918
968
1018
µA
Z
IREF=20 µa
2.7
2.8
2.9
V
J1/2
IREF=0.5 mA
1.61
/FS
VREF
IO
Reference Voltage
Linearity Error
INPUT LOGIC SECTION
VINL
Input lOw Voltage
R
S
-0.3
0.8
V
VINH
Input High Voltage
T
U
2
7
V
IL
Input
V
W
-10
µA
IH
Input High Current High Voltage
X
Y
30
µA
8/13
L6515
APPLICATION CIRCUIT
TRUTH TABLE TACHO-ENCODER LOGIC
INPUT SIGNAL
PDIB > PDIA
C 1 = HIGH
PDIB < PDIA
C 1 = LOW
PDIB > PDIA
C2 = HIGH
PDIB < PDIA
C2 = LOW
SWITCH SIGNAL
C1
C2
CLOSED
S2 POSITION
L
H
S1
TSPO
H
H
S2
TSPO
H
L
S3
TSPO
L
L
S4
TSPO
9/13
L6515
TRUTH TABLE LOGIC SELECTION CHIP ADDRESS
DECODER ADDRESS
Terminals
Functions
R
S
L
L
NO ACTION
H
L
STROBE LATCH 1
L
H
STROBE LATCH 2
H
H
RESET LATCH 1/2
LATCH ADDRESS
TIMING DIAGRAM OF COUNTER AND DIRECTION INDICATION LOGIC
10/13
L6515
POSITION ENCODER
Main advantage of the operation principle of the
positioning system is that a high performance position encoder is not required.
The system accepts several phases and amplitude errors of the encoder output signal without
affecting the system performance.
Two position sensors are useful.
1) Optical-Encoder with IR-LED and Phototransistor
Figure 1.
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.
11/13
L6515
PLCC44 PACKAGE MECHANICAL DATA
mm
DIM.
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
E
0.68
14.99
0.027
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
12/13
inch
0.101
0.004
M
1.16
0.046
M1
1.14
0.045
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.
 1994 SGS-THOMSON Microelectronics - All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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