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AMT2031024-8000-E Datasheet(PDF) 5 Page - CUI INC |
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AMT2031024-8000-E Datasheet(HTML) 5 Page - CUI INC |
5 / 7 page cui.com date 02/12/2013 │ page 5 of 7 CUI Inc │ SERIES: AMT203 │ DESCRIPTION: MODULAR ENCODER APPLICATION NOTES 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: Only the Fine channel is active and the MCU internal position register is updated with data from Fine: – MCU 12 bit position register is updated from Fine every 48 μs. – For accurate position update without above time delay, outputs for incremental A quad B or Count and Up/Dwn from the Fine channel are provided. These outputs are operational up to 8000 RPM and there is no speed error. There is an acceleration error dependent on an internal filter constant of about 100 μs. – When using the incremental output there also is an Index output available, with one index pulse per turn. 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 (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. Serial Peripheral Interface Bus (SPI) on AMT203 Figure 7: SPI BUS Timing Diagram The msb data out on MISO is valid soon after CSB goes low. The MOSI data is valid soon after the falling edge of SCK. The Encoder drives data out on MISO as long as CSB is low. Normally, CSB goes low, then after 8 clocks the command is interpreted. CSB high resets the clock counter, and terminates any command sequence. 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 |
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