date

page

04/2010

1 of 8

phone 503.612.2300

fax 503.612.2380 www.cui.com

PART NUMBER:

DESCRIPTION:

AMT203

12 BIT ABSOLUTE ENCODER

This encoder is a 12 bit absolute rotational encoder with SPI serial bus for working as a slave to an external

microprocessor. Incremental A,B and Index signals are provided for high speed operation. The Index is one pulse

per 22.5 degree (16 index per turn).

The encoder contains two channels of a capacitive encoder: a Fine channel and a Coarse channel. The Fine channel

has 16 wavelengths of a periodic capacitive pattern, while the Coarse channel has 5 wavelengths. Each channel has

its own ASIC that interpolates to a resolution of 256 increments per wavelength. A microprocessor on the encoder

PCB is combining the two channels for a position reading that is absolute over a full turn with 12 bit resolution.

ELECTRONIC SPECIFICATIONS

parameter

conditions/description

min

nom

max

units

power supply

2.7

5

5.5

V

current consumption

810

mA

output resolution

1024

ppr

incremental output signals

A, B, Z phase

incremental output waveform

square wave

incremental outputs

output voltage - sourcing to +5 V @ -32 mA

output voltage - sinking to ground @ -32 mA

3.8

0.55

V

V

index output

one index pulse per 1/16 turn

SPI output

natural binary

SPI bus

PIC 16F690 (see datasheet)

SPI resolution

12

bit

MECHANICAL SPECIFICATIONS

parameter

conditions/description

min

nom

max

units

output range

360

deg

SPI speed

8000

RPM

mounting hole options

A) 2 each M1.6 holes on 16 mm (0.63”) bolt circle

B) 2 each #4 holes on 19.05 mm (0.75”) bolt circle

C) 2 each M1.6 or M2 holes on 20 mm (0.787”) bolt

circle

D) 3 each M1.6 or M2 holes on 20.9 mm (0.823”)

bolt circle

E) 3 each M1.6 or M2 holes on 22 mm (0.866”) bolt

circle

F) 4 each M1.6 or M2 holes on 25.4 mm (1”) bolt

circle

G) 2 each #4 holes on 15.75 mm (0.62”) x 20.96

(0.825”) hole layout*

H) 2 each #4 holes on 32.43 mm (1.277”) bolt circle*

I) 2 each #4 holes on 46.03 mm (1.812”) bolt circle*

ENVIRONMENTAL SPECIFICATIONS

parameter

conditions/description

min

nom

max

units

operating temperature

-25

85

°C

storage temperature

-40

100

°C

humidity

85

%RH

vibration

1.5mm, 3 directions, 2 hours

10

55

Hz