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NSD-1202 Datasheet(PDF) 8 Page - ams AG |
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NSD-1202 Datasheet(HTML) 8 Page - ams AG |
8 / 13 page www.austriamicrosystems.com Revision 0.1 8 - 13 NSD-1202 Data Sheet - D e t a i l e d D e s c r i p t i o n 7.5 Period Counter The period counter is used to define the switching frequency of the motor. The pulse period is generated by dividing the clock input frequency by the given period counter value. The MSB of the high byte of the pulse counter (h) is used to enable the internal frequency doubler. This function should be used only for input clock frequencies of 10MHz or less. At 20MHz input clock a decimal period counter value of 111 gives an output frequency of 180.18 kHz. A period counter value of 112 results in a switching frequency of 178.75 kHz. This is equal to a maximum frequency step of 1.61 kHz. The frequency resolution gets better for lower output frequencies, assuming a fixed input clock frequency. The following table presents examples of the period counter and output switching frequency relationship. The values are given for 20MHz and 10MHz clock input frequency. (At 10MHz the frequency doubler can be activated, which leads to the same results.) 7.6 Pulse Counter The pulse counter sets the number of pulses the motor should be active. Writing all zeros to the pulse counter stops the motor, even if the previous set counter value is not completed. All outputs are then low. The same is valid for power-down mode. Bit 6 of the high byte in the pulse counter (d) is used to set the direction of motor motion. 7.7 Output Voltage Register This register is used to define the output voltage of the boost converter. The register value is directly transferred to the analog part. The default value for this register set during power up or power down (XPD = LOW) is equal to 35V nominal output voltage. Varying the output voltage can be used to vary the speed of the motor. However, if two motors are being driven, both motors use a common output voltage and therefore one setting applies to both motors. To control the speed of two motors independently, use the Duty Cycle Register. Period Counter Value Typ Unit 0110 1111 180.18 kHz 0111 0000 178.57 kHz 1000 0101 150.37 kHz 1000 0110 149.25 kHz 1000 1110 140.85 kHz 1000 1111 139.86 kHz Pulse Counter Value Typ Unit Conditions XXXX X000 0000 0000 0 pulses Motor is off, driver outputs are low XXXX X100 0000 0000 1024 pulses XXXX X111 1111 1111 2047 pulses Maximum possible number of pulses Output Voltage Register Typ Unit Conditions 0001 0001 24.0 V 0001 0010 24.5 V 0001 1111 31.0 V 0010 0111 35.0 V Default value 0011 0000 39.5 V 0011 0001 40.0 V |
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