AMT303-DMK CUI Inc, AMT303-DMK Datasheet - Page 5

• Manufacturer Part Number: AMT303-DMK
• Description: DEMO KIT AMT303-V ENCODERS
• Manufacturer: CUI Inc
• Series: AMT303r

Specifications of AMT303-DMK

• Sensor Type: Encoders, Capacitive
• Sensing Range: 360°
• Interface: SPI, Incremental with Index
• Sensitivity: 1024 PPR
• Voltage - Supply: 2.7 V ~ 5.5 V
• Embedded: No
• Utilized Ic / Part: AMT303
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 102-2053

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
MOSI
CSB
MISO
SCK
• Initialization mode: At power up the encoder goes through an initiation and stabilization procedure.
• Tracking mode:
msb
20050 SW 112
msb
Setup
– 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
MOSI: Master Out Slave In
MISO: Master In Slave Out
SCK: Serial Clock
CSB: Chip Select Bar (active low)
update rate, leaving a remaining jitter of less than 24 μs RMS.
Serial Peripheral Interface Bus (SPI) on AMT303
Pole Count
Speed Limit RPM
AMT303
•The communication jitter expressed in electrical degrees will be proportional speed and
th
does not reach 6 deg RMS until the speed reaches the following values:
Ave. Tualatin, Oregon 97062
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.
4
17,361
6
11,574
phone [phone]
DESCRIPTION:
8
8,681
lsb
lsb
6,944
fax [phone] www.cui.com
10
COMMUTATION ENCODER
Terminology
MSB = most significant byte
LSB = least significant byte
msb = most significant bit
lsb = least significant bit
12
5,787
date
page
20
3,472
12/2010
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