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AMT303Z-0500-3175 Datasheet(PDF) 5 Page - CUI INC |
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AMT303Z-0500-3175 Datasheet(HTML) 5 Page - CUI INC |
5 / 7 page date page PART NUMBER: DESCRIPTION: 11/2010 5 of 7 Encoder operational mode • Initialization mode: At power up the encoder goes through an initiation and stabilization procedure. This includes microprocessor stabilization and the program for combining Coarse and Fine channel of the encoder for getting the absolute start position. This takes less than 0.1 seconds. • Tracking mode: – MCU 12 bit position register is updated from Fine Asic every 48 μs. – The commutation program in the MCU has a compensation for the average delay caused by the update rate, leaving a remaining jitter of less than 24 μs RMS. •The communication jitter expressed in electrical degrees will be proportional speed and does not reach 6 deg RMS until the speed reaches the following values: Serial Peripheral Interface Commands The SPI or Serial Peripheral Interface Bus is a standard interface promoted by Motorola and Microchip among others. It consists of 4 signals: MOSI: Master Out Slave In MISO: Master In Slave Out SCK: Serial Clock CSB: Chip Select Bar (active low) SPI BUS The SPI bus runs full duplex and transfers multiples of 8 bits in a frame. The SPI type is the most common (CPOL=0, CPHA=0), also known as Microwire. Data is captured on the rising edge of SCK and the output data is changed after the falling edge of SCK. Figure 7: SPI BUS Timing Diagram Serial Peripheral Interface Bus (SPI) on AMT303 APPLICATION NOTES Pole Count 4 6 8 10 12 20 Speed Limit RPM 17,361 11,574 8,681 6,944 5,787 3,472 SCK MISO MOSI CSB msb lsb msb lsb Setup Terminology MSB = most significant byte LSB = least significant byte msb = most significant bit lsb = least significant bit 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2380 www.cui.com AMT303 COMMUTATION ENCODER |
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