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AMT303-0512-4000 Datasheet(PDF) 6 Page - CUI INC

No. de pieza AMT303-0512-4000
Descripción Electrónicos  COMMUTATION ENCODER
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Fabricante Electrónico  CUI [CUI INC]
Página de inicio  http://www.cui.com
Logo CUI - CUI INC

AMT303-0512-4000 Datasheet(HTML) 6 Page - CUI INC

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PART NUMBER:
DESCRIPTION:
11/2010
6 of 7
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.
SPI Commands:
The commands are all 8 bits long, the MSB is shifted in first, and is the leftmost bit shown in Figure 7.
Encoder Protocol Considerations:
The Encoder is designed to operate with a high speed SPI link, in full duplex mode. This implies the host can is-
sue commands and read data as quickly as necessary but there has to be an acknowledgement from the slave just
before the data is transferred.
Essentially the host issues a command, receives zero or more wait sequences (0xA5 or 1010,0101) then the echo
of the command followed by an optional payload.
So, for example to read the position, the host issues rd_comm, receiving a series of wait sequences (0xA5) then a
reflected rd_comm, then the MSB data followed by the LSB data.
It is recommended that the host leave a 20 μs gap between reads to avoid extending the read time by forcing wait
sequences.
Command 0x00: nop_a5
This command is ignored by the Encoder and simply causes the next data to be read. The encoder responds with
0xA5 if there is nothing else to send.
Note that it is possible to overlap commands, so instead of NOP is several steps above the user could start another
operation. The read and write FIFOs for the PCI streams are 16 bytes long and it is up to the user to avoid overflow.
Command 0x51: rd_comm
This command causes the commutation values and EIDXN value to be read and put in the output fifo.
The reply is 2 bytes, the first byte is reserved (eg. A lookup value between 0 and 31 but subject to change), the
second byte has EIDXN,U,V,W in the low 4 bits.
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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