Anaheim Integrated Circuit LSILS7290 User Manual

							STEPPER MOTOR  CONTROLLER 
FEATURES:
•  Controls Bipolar and Unipolar Motors
•  Cost-effective replacement for L297 in Bipolar applications
•  Full, 1/2, 1/4, 1/8, 1/16, 1/32, step mode selected with 3 mode in\
puts
•  Direction control
•  Reset input
•  Step control input
•  Enable input
•  PWM chopper circuit for current control
•  8-bit PWM resolution
•  Two peak current comparators with external reference input
•  Step control frequency and duty cycle controlled by an external fr\
equency
   source or by an internal crystal controlled oscillator (typically 8M\
Hz)
•  All inputs and outputs TTL/CMOS compatible (TTL for 5V operation)\
•  3V to 5.5V Operation (V
DD - VSS).
•   LS7290  (DIP), LS7290-S  (SOIC), LS7290-TS  (TSSOP) -  See Figure 1  - PIN ASSIGNMENT
 TOP VIEW
July 2009
7290-073109-1
LSI/CSI
LSI  C o m pute r Sy ste m s, I n c.   12 35 W alt  W hit m an  Ro ad, M elv ill e, N Y 1 174 7     (631 ) 2 71 -0 40 0   F A X  (631 ) 2 7 1-0 4 05
LS7290
DESCRIPTION:
The  LS7290  generates Phase Drive outputs and PWM outputs for controlling
two phase  Bipolar motors  or four phase Unipolar motors,  respectively. The
LS7290  contains a mode controlled look-up table for generating the motor duty
cycle drive sequences. There are four outputs which are used to drive tw\
o H-
Bridges for the two motor windings in the Bipolar motor or the four Driv\
er Tran-
sistors for the two center-tapped windings in the Unipolar motor (Refer\
 to Table
2). The  LS7290  can step a motor in full steps, half steps or in 1/4, 1/8, 1/16 or
1/32 microsteps. The  LS7290 uses 32 microstepping phase controls for each
motor step in half step or in 1/4, 1/8, 1/16 or 1/32 microsteps. The  LS7290 uses
stepping as shown in Table 2 for full step control. A table pointer is u\
sed which
is incremented or decremented by a value determined by the operating mod\
e
and the direction control. The 8-bit PWM control and the refresh rate ar\
e set us-
ing an internal oscillator controlled by a crystal or by use of an exter\
nal input
clock. Typical refresh rate is equal to 31.25kHz.  Peak current feedback con-
trol using pulse width modulation chopping can only be used in full-step\
or half-step modes.  The chopper consists of a voltage comparator, flip-flop
and external sense resistor. The internal oscillator sets the flip-flop \
and enables
the INH1 and INH2 outputs at the beginning of each PWM cycle. Once the
peak motor current causes the voltage across the sense resistors to reac\
h the
voltage set by VREF, the outputs are disabled until the next oscillator \
pulse.
The VREF voltage sets the peak current in each motor winding.  In all other
modes, the VREF input should be set to V
DD and the sense inputs should
be grounded.
INPUT/OUTPUT DESCRIPTION
RESET Input
Active low. Resets the PWM table pointer to HOME position per Table 2 an\
d
brings INH1 and INH2 low. Upon power-up, a POR circuit also resets the P\
WM
table pointer.
ENABLE Input
Active low. When high (inactive), brings PHA, PHB, PHC, PHD, INH1 and \
INH2
outputs low. 
STEP Input
Active low. A low-going pulse on this input causes the motor to advance \
one
step. FRD/RVRS Input
A low input causes the motor to move in decremental steps
per Table 2. A high input causes the motor to move in in-
cremental steps per Table 2 Switching directions can occur at
any time.
M0, M1, M2 Inputs
Defines the stepping modes as follows:
                              
M2    M1  M0
full step mode 0 0 0
1/2 step mode 0       0 1
1/4 step mode 0       1 0
1/8 step mode 0 1 1
1/16 step mode 1 0 0
1/32 step mode 1 0 1
1/32 step mode 1 1 0
1/32 step mode 1 1 1 
Stepping Mode can be changed at any time.
SENSE1 / SENSE2 Inputs
SENSE1 is the input for the voltage across the sense resistor
determined by the current in the motor winding driven by the
PHA and PHB power stages. SENSE2 is the input for the volt-
age across the sense resistor determined by the current in the
motor winding driven by the PHC and PHD power stages.
VREF Input
External voltage reference for current control comparators.
U L®
A3800
LSI   1
LS7290
   FIGURE 1
   2
   3
   4
   5
   6
  24
  23
  22
  21
  20   
19
   7
   8
   9 10
  11
  12
  18
  17
  16
  15
  14
  13
M0
M1
M2
Rx
  CLK Cx
   V 
SS
VDD
PHA
PHB
PHC
PHD
DS1
DS0
SENSE1
VREF
RESET
  STEP
  ENABLE
 
INH1
 INH2
SENSE2
 
FRD/REV
 HOME 
						

							Rx, Cx, CLK
These three pins can be configured in one of three ways to ob-
tain the primary clock. A crystal connected between Rx and
CLK pins or a resistor-capacitor pair connected among all three
pins (see Figure 4) can make use of the internal oscillator. Al-
ternatively, the CLK pin can be driven from an external clock
source.
DS0 / DS1 Inputs
The phase drive is blanked out between steps by switching out-
puts INH1 and INH2 low in order to reduce audible noise and
power consumption. The duration of the blanking is selected by
DS0 and DS1 according to Table 1
 
                                  
Table 1
  DS1 DS0 Blanking Time, IPB, at fc = 8MHz  0   0             1.25us
  0   1             2.50us  1   0             3.75us  1   1             5.00us
PHA / PHB / PHC / PHD Outputs
The state of these phase outputs are determined by the look-up table
and are used to control either the left or right half of each of the H-
Bridge drivers. A low on a phase output enables the bottom driver
while a high on the output enables the top driver.
HOME  Output
Indicates Step0 state per Table 2 with a logic low.
  
  
INH1 / INH2 Outputs
These outputs are used to provide PWM control to each of the two H-
Bridge drivers.
       
7290-092607-2
FIGURE 2.  LS7290 BLOCK DIAGRAM
OSCILLATOR OUTPUT 
CONTROL LOGIC
PHB
PHA
PHC
PHD
SENSE1
 SENSE2
  VREF
M0
M1
    M2
   RESET
   STEP
    R X
   CLK
 C
X
     ENABLE
+
- +
 -
   FRD/RVRS INH1
INH2
MODE
SELECT
LOOK-UP
TABLE
DS0
   DS1
  22
  21
  20
  19
  18
  23
  17
  13
  15
  14
  4
  5
  6
   9
 10
 11
  1
  2
  7
  16
  3
 12VSS( -V )
 24(+V )
VDD
  8HOME
The information included herein is believed to be
accurate and reliable.  However, LSI Computer Systems,
Inc.  assumes no responsibilities for inaccuracies, nor for
any infringements of patent rights of others which may
result from its use. 
						

							ABSOLUTE MAXIMUM RATINGS:
PARAMETER  
SYMBOLVALUEUNIT
DC Supply Voltage VDD  - V SS    +7    V
Any Input Voltage     VIN                                       VSS  - 0.3 to V DD +0.3    V
Operating Temperature      TA                                                   -20 to +85   °C
Storage Temperature    TSTG  -85 to +150  °C
ELECTRICAL SPECIFICATIONS  (-25°C < TA < +85°C)
PARAMETER                         SYMBOL     MIN       TYP      MAX     \
 UNIT CONDITIONS
Supply Voltage VDD 3.0 -5.5 V -
    Supply Current  IDD -2.0 mA Outputs floating, Inputs high
CLK frequency  fc -8.00- MHz -
Enable Propagation Delay  tepd 100-- ns -
    FRD / RVRS Setup Time  tds 0-- us -
(before step pulse)
Step Pulse Width SPW1.0-- us at fc = 8 MHz
Interstep Pulse Delay ISD32-- us at fc = 8 MHz
Interstep Phase Blanking IPB1.25-5.0 us at fc = 8 MHz
Reset Pulse Width RPW 1.0 -- us at fc = 8 MHz
Reset to Step Pulse Delay trs 0- - us -
Hi-Level Input Voltage ViH 2 -- V VDD  = 5 ± 0.25V
Low-Level Input Voltage  VIL - -0.8         V VDD  = 5 ± 0.25V
Hi-Level Input Current IH --50 nA Leakage Current
Low-Level Input Current IL --            50 nALeakage Current
Output Sink Current Io-10-- mA Vo = 0.4V, V DD = 5V
Io -5-- mA Vo = 0.4V, V DD = 3.3V
Output Source Current Io 5-- mA Vo = 4.0V, V DD = 5V
Io 2.5-- mA Vo = 2.5V, V DD = 3.3V
Comparator Offset Voltage VOS - 515 mV VREF  = 1V
Input Reference Voltage VREF 0.5 -3.0 V VDD  = 5V
V REF         0.5  -1.5 V VDD  = 3.3V
7290-121508-3 At V
DD = 5V and R = 2.2k , C = 12pF,
oscillator frequency is 8MHz (typical)
FIGURE 3.  RC OSCILLATOR FOR CLOCK GENERATOR9
10
11
RX
CLK
CX
VDD
VSS
+V
24
12
fC  ~ 1/5RC
LS7290
R
   C 
						

							                 FIGURE 4.  PARTIAL SEQUENCE IN FORWARD 1/2 STEP MODE
7290-011409-4RESET
STEP
PHA
PHB
PHC
PHD
INH1
HOME
INH2
 RPW
SPW
IPBIPB
IPBIPB
PWM 
						

							                         FIGURE 5.  TYPICAL APPLICATION SCHEMATIC FOR A \
TWO PHASE 
                                             BIPOLAR MOTOR USING A SINGL\
E MOTOR DRIVER IC
7290-060608-5
  14
  
15
12
  10  9
  7
 6
5
 4
 3
2
 1
 19
  2122
 23
24
    
11
           7
10  
9    
4
 2
 3
  13
  14
 1  15  8
 MCU LS7290 L298
5V
 V 
M
 M0
   M1
 M2
       
RESET
ENABLE
STEPPER
MOTOR
WINDINGS
 PHA
 PHB
 PHC
 PHD
  SENSE1 VREF
 INH1
 INH2
STEP
 FRD/RVRS
VDD
   VSS
25pF
25pF 10M
  SENSE2
  13
 18 12
    
6
0.01uF 0.01uF
100
 100
  RX
  CLK
 INH1
  INH2
PHA
PHB
PHCPHD
      7
      
5 20 
						

							FIGURE 6. TYPICAL APPLICATION SCHEMATIC FOR A TWO PHASE
           BIPOLAR MOTOR USING TWO SEPARATE MOTOR DRIVER ICs
7290-073109-6
 10    9  7
6
  5   4 3
  2 1
24
 MCU
LS72905V
 V
M
 M0
   M1
 M2
            
  
RESET
ENABLE
MOTOR WINDINGS
STEP
  FRD/RVRS
VDD
12
 VSS
25pF
25pF  10M
 0.01uF
 100
  RX
  CLK
  
14
  
15
 SENSE1
   VREF
   SENSE2
  13  100
  
VREF
18
  21
 23
 PHA IN1
 IN1
 ENABLE
 PHB
INH1
 19
 22
 PHC IN1
 IN1
 ENABLE
 PHD
INH2
  20
 VREF
       VS
 GND
 GND
      VS
SENSE
SENSE
 0.01uF MOTOR
WINDINGS
      R
BOOT1
  OUT1   OUT2
BOOT2
BOOT1
  OUT1
  OUT2
BOOT2
  15nF
    15nF    15nF
15nF
L6201
L6201PS L
6202

L
6203

L6201
L6201PS L
6202

L
6203
    R
     220nF
     220nF 
						

							7290-060608-7
                                      FIGURE 7.  TYPICAL APPLICATION SCH\
EMATIC FOR A FOUR PHASE                                        UNIPOLAR MOTOR USING DISCRETE MO\
SFET TRANSISTORS
NOTE:  Q1, Q2, Q3, Q4 are MOSFET Power Transistors suitable for 5V Gate \
Drive 
  Typical P/Ns = IRLZ44N and IRF3708
 10 97
  6  5 4
 3
  2 1
 24
 MCU
LS72905V
  M0
   M1
  M2
     
RESET
  ENABLE
STEP
  FRD/RVRS
 VDD
12
VSS
25pF
25pF 10M
 100
RX
CLK
 
14
15
 VREF
   SENSE2
 
13   0.01uF
 
  
21
 23 PHA  PHB
  INH1
  20
0.01uF  R
  SENSE1100
   R
22
 18 19
PHC
PHD
INH2
VM
VM
  1   2 3
74HC08
74HC08
  4
  5  6
 9
10
1213    8
Q1
 Q2
 Q3
Q4
  11 
						

							TABLE 2
          Step Number                      %  Duty Cycle                   Phases                     
Full   1/2   1/4  1/8    1/16   1/32      INH1      INH2     PHA    PHB    PHC    PHD    Step Angle
 
  0 0 0 0  0   0       100.0   0.0   1   0   1   0   HOME
    1 99.9   4.9   1   0   1   0     2.81
  1   2 99.5   9.8   1   0   1   0     5.63
    3 98.9 14.7   1   0   1   0     8.44
  1  2   4 98.1 19.5   1   0   1   0   11.25
     5 97.0 24.3    1   0   1   0   14.06
   3   6 95.7 29.0   1   0   1   0   16.88
    7 94.2 33.7   1   0   1   0   19.69
  1  2  4   8 92.4 38.3   1   0   1   0   22.50
     9 90.4 42.8   1   0   1   0   25.31
   5 10 88.2 47.1   1   0   1   0   28.13
 11 85.8 51.4   1   0   1   0   30.94
  3  6 12 83.1 55.6   1   0   1   0   33.75
 13 80.3 59.6   1   0   1   0   36.56
   7 14 77.3 63.4   1   0   1   0   39.38
 15 74.1 67.2   1   0   1   0   42.19
1 2  4  8 16 70.7 70.7   1   0   1   0   45.00
 17 67.2 74.1   1   0   1   0   47.81
   9 18 63.4 77.3   1   0   1   0   50.63
 19 59.6 80.3   1   0   1   0   53.44
  5      10 20 55.6 83.1   1   0   1   0   56.25
 21 51.4 85.8   1   0   1   0   59.06
         11 22 47.1 88.2   1   0   1   0   61.88
 23 42.8 90.4   1   0   1   0   64.69
  3  612 24 38.3 92.4   1   0   1   0   67.50
 25 33.7 94.2   1   0   1   0   70.31
13 26 29.0 95.7   1   0   1   0   73.13
 27 24.3 97.0   1   0   1   0   75.94
  714 28 19.5 98.1   1   0   1   0   78.75
 29 14.7 98.9   1   0   1   0   81.56
15 30   9.8 99.5   1   0   1   0   84.38
 31   4.9 99.9   1   0   1   0   87.19
  12 4  816 32   0.0     100.0   0   1   1   0   90.00
 33  -4.9 99.9   0   1   1   0   92.81
17 34  -9.8  99.5   0   1   1   0   95.63
 35-14.7 98.9   0   1   1   0   98.44
  918 36-19.5 98.1   0   1   1   0 101.25
 37-24.3 97.0   0   1   1   0 104.06
19 38-29.0 95.7   0   1   1   0 106.887290-092607-8 
						

							TABLE 2 (continued)
          Step Number                      %  Duty Cycle                   Phases                     
Full   1/2   1/4  1/8    1/16   1/32      INH1      INH2     PHA    PHB    PHC    PHD     Step Angle 
  39-33.7 94.2   0   1   1   0  109.69
    5  10 20  40-38.3 92.4   0   1   1   0  112.50
  41-42.8 90.4   0   1   1   0  115.31
 21  42-47.1 88.2   0   1   1   0  118.13
  43-51.4 85.8   0   1   1   0  120.94
  11 22  44-55.6 83.1   0   1   1   0  123.75
  45-59.6 80.3   0   1   1   0  126.56
 23  46-63.4 77.3   0   1   1   0  129.38
  47-67.2 74.1   0   1   1   0  132.19
  3   6  12 24  48-70.7 70.7   0   1   1   0  135.00
  49-74.1 67.2   0   1   1   0  137.81
 25  50-77.3 63.4   0   1   1   0  140.63
  51-80.3 59.6   0   1   1   0  143.44
  13 26  52-83.1 55.6   0   1   1   0  146.25
  53-85.8 51.4   0   1   1   0  149.06
 27  54-88.2 47.1   0   1   1   0  151.88
  55-90.4 42.8   0   1   1   0  154.69
    7  14 28  56-92.4 38.3   0   1   1   0  157.50
  57-94.2 33.7   0   1   1   0  160.31
 29  58-95.7 29.0   0   1   1   0  163.13
  59-97.0 24.3   0   1   1   0  165.94
  15 30  60-98.1 19.5   0   1   1   0  168.75
  61-98.9 14.7   0   1   1   0  171.56
 31  62-99.5   9.8   0   1   1   0  174.38
  63-99.9   4.9   0   1   1   0  177.19
  2  4   8  16 32  64     -100.0   0.0   0   1   0   1  180.00
  65-99.9  -4.9   0   1   0   1  182.81
 33  66-99.5  -9.8   0   1   0   1  185.63
  67-98.9-14.7   0   1   0   1  188.44
  17 34  68-98.1-19.5   0   1   0   1  191.25
  69-97.0-24.3   0   1   0   1  194.06
 35  70-95.7-29.0   0   1   0   1  196.88
  71-94.2-33.7   0   1   0   1  199.69
    9  18 36  72-92.4-38.3   0   1   0   1  202.50
  73-90.4-42.8   0   1   0   1  205.31
 37  74-88.2-47.1   0   1   0   1  208.13
  75-85.8-51.4   0   1   0   1  210.94
  19 38  76-83.1-55.6   0   1   0   1  213.75
  77-80.3-59.6   0   1   0   1  216.56
39  78-77.3-63.4   0   1   0   1  219.38
  79-74.1-67.2   0   1   0   1  222.19
  5 10  2040  80-70.7-70.7   0   1   0   1  225.00
  81-67.2-74.1   0   1   0   1  227.81
41  82-63.4-77.3   0   1   0   1  230.63
  83-59.6-80.3   0   1   0   1  233.447290-092607-9 
						

							TABLE 2 (continued)
          Step Number                      %  Duty Cycle                   Phases                     
 Full  1/2   1/4  1/8    1/16   1/32      INH1      INH2     PHA    PHB    PHC    PHD     Step Angle 
  21 42  84-55.6-83.1   0   1    0   1   236.25
  85-51.4-85.8   0   1    0   1   239.06
 43  86-47.1-88.2   0   1    0   1   241.88
  87-42.8-90.4   0   1    0   1   244.69
  11  22 44  88-38.3-92.4   0   1    0   1   247.50
  89-33.7-94.2   0   1    0   1   250.31
 45  90-29.0-95.7   0   1    0   1   253.13
  91-24.3-97.0   0   1    0   1   255.94
  23 46  92-19.5-98.1   0   1    0   1   258.75
  93-14.7-98.9   0   1    0   1   261.56
 47  94  -9.8-99.5   0   1    0   1   264.38
  95  -4.9-99.9   0   1    0   1   267.19
   3  6 12  24 48  96   0.0-100   1   0    0   1   270.00
  97   4.9-99.9   1   0    0   1   272.81
 49  98   9.8-99.5   1   0    0   1   275.63
  99 14.7-98.9   1   0    0   1   278.44
  25 50100 19.5-98.1   1   0    0   1   281.25
101 24.3-97.0   1   0    0   1   284.06
 51102 29.0-95.7   1   0    0   1   286.88
103 33.7-94.2   1   0    0   1   289.69
 13  26 52104 38.3-92.4   1   0    0   1   292.50
105 42.8-90.4   1   0    0   1   295.31
 53106 47.1-88.2   1   0    0   1   298.13
107 51.4-85.8   1   0    0   1   300.94
  27 54108 55.6-83.1   1   0    0   1   303.75
 109 59.6-80.3   1   0    0   1   306.56
 55110 63.4-77.3   1   0    0   1   309.38
111 67.2-74.1   1   0    0   1    312.19
  7 14  28 56112 70.7-70.7   1   0    0   1   315.00
113 74.1-67.2   1   0    0   1   317.81
 57114 77.3-63.4   1   0    0   1   320.63
115 80.3-59.6   1   0    0   1   323.44
  29 58116 83.1-55.6   1   0    0   1   326.25
117 85.8-51.4   1   0    0   1   329.06
 59118 88.2-47.1   1   0    0   1   331.88
119 90.4-42.8   1   0    0   1   334.69
 15  30 60120 92.4-38.3   1   0    0   1   337.50
 121 94.2-33.7   1   0    0   1   340.31
 61122 95.7-29.0   1   0    0   1   343.13
123 97.0-24.3   1   0    0   1   345.95
  31 62124 98.1-19.5   1   0    0   1   348.75
125 98.9-14.7   1   0    0   1   351.56
 63126 99.5  -9.8   1   0    0   1   354.38
127 99.9  -4.9   1   0    0   1   357.19
   0      0       0      0      0         0      100.0         0.0        1          0          1         0           HOME7290-092607-10