SPINX1 MANUAL
PWM TO ANALOG SPINDLE INTERFACE
V1.0
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Table of Contents
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
CONNECTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
CONNECTOR AND SIGNAL LOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INPUT CONNECTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
OUTPUT CONNECTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
OPERATION
INPUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
5V POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
MONITOR LEDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
ANALOG OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
ISOLATED OUTPUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
SPINX1 1
GENERAL
DESCRIPTION
The SPINx1 is a one channel isolated digital potentiometer intended for spindle
control. The SPINx1 takes three TTL level signals, PWM,DIR and ENA and has four
isolated outputs: CW, CCW, ENA and VOUT. VOUT is a buffered analog voltage
proportional to the PWM input and the externally supplied analog reference voltage (5 to
15VDC).
SPINX1 2
CONNECTORS
CONNECTOR AND SIGNAL LOCATIONS
SPINX1 3
CONNECTORS
INPUT CONNECTOR
6 pin 3.5 MM terminal block TB1 is used to the SPINX1s TTL level input
connections.
PIN FUNCTION LEVEL
1 GND
2 GND
3 PWM ACTIVE HIGH
4 ENABLE ACTIVE LOW
5 DIR HIGH = CW
6 +5V
OUTPUT CONNECTOR
10 pin 3.5 MM terminal block TB1 is used to the SPINX1s isolated output
connections. TB1 is normally split to a 3 pin connector for the anlaog out and a 6 pin
connector for the isolated digital outputs.
PIN FUNCTION DESCRIPTION
1 SP- SPINDLE ANALOG OUT LOW
2 SPV SPINDLE ANALOG OUT
3 SP+ SPINDLE ANALOG OUT HIGH
4 NC NOT USED
5 ENA- SPINDLE ENABLE 6 ENA+ SPINDLE ENABLE +
7 CW- SPINDLE CW8 CW+ SPINDLE CW+
9 CCW- SPINDLE CCW10 CCW+ SPINDLE CCW+
SPINX1 4
OPERATION
INPUTS
Three TTL level digital inputs are required for SPINX1 operation, ENABLE, PWM
and direction. The ENABLE input is active low, that is it must be pulled low to enable
analog and digital outputs. The PWM signal is active high. The PWM signal is terminated
with 220/330 ohm termination resistors for signal fidelity. The DIR input is high for CW and
low for CCW
5V POWER
The SPINX1 requires ~50 mA of 5V power for operation. This is applied to TB1 input
pins 1 and 6.
MONITOR LEDS
Monitor LEDs are provided on the PWM,ENABLE, and DIR lines. The enable LED
illuminates when ENABLE is asserted, the CW or DIR LED illuminates when the direction
is CW
ANALOG OUT
The SPINX1 provides an analog output for spindle control. The analog output is a
isolated potentiometer replacement type device. It functions like a potentiometer with SP+
being the positive end of the potentiometer, SPV being the wiper and SP- being the
negative end. The voltage on SPV pin out can be set to any voltage between SP- and
SP+. Polarity and voltage range must always be observed for proper operation. The
voltage supplied between SP+ and SP- must be between 5VDC an 15VDC with SP+
always being more positive than SP-. The analog output voltage is set by PWM from the
controller. The optimum PWM frequency is approximately 5KHz, Higher frequencies will
have lower ripple but more non-linearity, lower frequencies will have better linearity but
more ripple.
A 50% duty cycle PWM signal will result in a 50% voltage output. The voltage output
is gated by the ENABLE interface signal, and forced to = SP- when enable is not asserted
(enable is active low at the FPGA interface level).
Because the analog output is isolated, bipolar output is possible, for example with
SP+ connected to 5V and SP- connected to -5V, a +=5V analog output range is created.
In this case the PWM output must be offset so that 50% PWM is generated when a 0V
output is required. Note that if bipolar output is used, the output will be forced to SP- at
startup or when ENABLE is false.
SPINX1 5
OPERATION
ISOLATED OUTPUTS
TheSPINX1 provides 3 isolated outputs for use for spindle direction control, spindle
enable or other applications. These outputs are OPTO coupler Darlington transistors. They
are all isolated from one another so can be used for pull up or pull-down individually. They
will switch a maximum of 50 mA at 0 to 100 VDC. The ENABLE output is special as it uses
the same signal that enables the analog output. When the analog output is enabled, the
ENABLE OPTO output is on. The CW and CCW outputs can only be enabled then the
ENABLE input is asserted.
ENABLE IN DIR IN ENABLE OUT CW OUT CCW OUT
0 0 ON OFF ON
0 1 ON ON OFF
1 X OFF OFF OFF
Note that the isolated outputs are all individual switches so must always have both
the + and - pins connected with switch polarity observed.
SPINX1 6
SPECIFICATIONS
MIN MAX UNITS
5V POWER SUPPLY 4.75 5.25 VDC
5V POWER CONSUMPTION --- 50 mA
ANALOG REFERENCE VOLTAGE 5 15 Volts
(from SP- to SP+)
ANALOG SUPPLY CURRENT
C
5 mA
ANALOG ISOLATION VOLTAGE
C
2000 Volts DC
(from input side)
ANALOG OUTPUT NON-LINEARITY
C
1 % at 5KHz
ANALOG OUTPUT BANDWIDTH 60
C
Hz
ISOLATED OUTPUT CURRENT
C
50 mA
ISOLATED OUTPUT SWITCH VOLTAGE
C
100 Volts DC
ISOLATION VOLTAGE
C
2000 Volts DC
(From input side)
OPERATING TEMP. 0 +70
o
C
OPERATING TEMP. (-I version) -40 +85
o
C
OPERATION HUMIDITY 0 95% NON-COND
SPINX1 7
REFERENCE INFORMATION
CARD DIMENSIONS
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