AMT203-V CUI Inc, AMT203-V Datasheet - Page 5

• Manufacturer Part Number: AMT203-V
• Description: KIT AMT203 ABS SPI ENCODER
• Manufacturer: CUI Inc
• Series: AMT203r

Specifications of AMT203-V

• Featured Product: AMT203 Absolute Encoder
• Encoder Type: Capacitive
• Output Type: Binary (Absolute), Quadrature with Index (Incremental)
• Pulses Per Revolution: 1024
• Voltage - Supply: 5VDC
• Actuator Type: 2mm ~ 8mm Open Center
• Detent: No
• Built In Switch: No
• Mounting Type: Chassis Mount, Motors
• Orientation: Right Angle
• Termination Style: Terminal Pins
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Rotational Life (cycles Min): -
• Other names: 102-2050

PART NUMBER:
APPLICATION NOTES
Encoder operational mode
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:
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
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.
MOSI
CSB
SCK
MISO
• Initialization mode: At power up the encoder goes through an initiation and stabilization procedure.
• Tracking mode: Only the Fine channel is active and the MCU internal position register is updated with
20050 SW 112
MSB
MSB
Setup
– 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
– When using the incremental output there also is an Index output available, with one index pulse
MOSI: Master Out Slave In
MISO: Master In Slave Out
SCK: Serial Clock
CSB: Chip Select (active low)
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.
per turn.
Serial Peripheral Interface Bus (SPI) on AMT203
AMT203
th
Ave. Tualatin, Oregon 97062
data from Fine:
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.
phone [phone]
DESCRIPTION:
LSB
LSB
fax [phone] www.cui.com
12 BIT ABSOLUTE ENCODER
Terminology
MSB = most significant byte
LSB = least significant byte
msb = most significant bit
lsb = least significant bit
date
page
12/2010
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