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IM2000S Datasheet(PDF) 10 Page - List of Unclassifed Manufacturers |
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IM2000S Datasheet(HTML) 10 Page - List of Unclassifed Manufacturers |
10 / 16 page 10 Chip Select (CSEL) Input The CSEL input is used to select a number of functions that are implemented using the MSEL0 and MSEL1 inputs. If CSEL is low, or not connected, MSEL0 and MSEL1 will function as microstep select lines as explained earlier. If CSEL is high, MSEL0 and MSEL1 may be used to: ! Reset the IM2000S. ! Disable the PWM and driver control outputs. ! Channel the Step Clock Input to COUT. The relationship between the MSEL0 and MSEL1 inputs and these special functions are illustrated in Table 3.2. Full Step Output This active high output indicates when the motor is electrically on a full step (the poles of the motor are aligned). This occurs when either the sine or cosine outputs are at zero. This signal may be used to greatly reduce the overhead needed to monitor position, decreasing the number of counts needed to track position. By utilizing the full step output it is no longer necessary to keep track of the number of microsteps between steps on moves until the last fractional step. With the full step output, it is possible to track position as a combination of full steps plus the number of microsteps occuring after the last full step. In the case of long moves at high resolutions this feature will reduce the position counter size and the overhead associ- ated with updating/monitoring the position counter. Dual PWM The IM2000S contains a unique dual PWM circuit that efficiently and accurately regulates the current in the windings of a two phase stepping motor. The internal PWM accomplishes this by using an alternating recirculating/non-recirculating mode to control the current. Recir culating In a recirculating PWM, the current in the windings is contained within the output bridge while the PWM is in its OFF state (after the set current is reached). This method of controlling the current is efficient when using low inductance motors, but lacks response because of its inability to remove current from the windings on the downward cycle of the sine/ cosine wave (See Figure 3.3). Non-Recir culating In a non-recirculating PWM, the current flows up through the bridge and back to the supply in the OFF phase of the cycle. This method of controlling current allows for much better response but reduces efficiency and increases current ripple, especially in lower inductance motors (See Figure 3.4). The IM2000S PWM utilizes the best features of both by combining recirculating and non-recirculating current control. On the rising edge of the sine/cosine waveform, the PWM will always be in a recirculating mode. This mode allows the driver to run at peak efficiency while maintaining minimum current ripple even with low inductance motors. On the downward cycle of the sine/cosine waveform, the PWM operates in a two part cycle. In the first part of its cycle the PWM is in a non-recirculating mode to pull current from the motor windings. In the second part of the cycle the PWM reverts back to recirculating mode to increase efficiency and reduce current ripple. Table 3.2: Chip Select Settings s g n i t t e S L E S C 1 L E S M 0 L E S M n o i t c n u F 00 T U O C o t K L C S 0 1 T U O C o t K L C S 10 r e ll o r t n o C t e s e R 1 1 s t u p t u O e l b a s i D Figure 3.3: Recirculating PWM DRIVE CURRENT RECIRCULATION |
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