EPOS2 Application Notes Collection - Maxon Motor

Extended Encoders Configuration
Sensor Types
13.3 Sensor Types
13.3.1 SSI Absolute Encoder
13.3.1.1 General Description
The Synchronous Serial Interface (SSI) is an interface to connect an absolute position sensor to a controller,
such as EPOS2 70/10 or EPOS2 50/5. This interface uses a clock signal from the controller to
the sensor and a data signal from the sensor back to the controller. The serial data stream from the sensor
begins with the most significant bit.
The number of data bits (for multi turn and single turn resolution) and the clock rate can be configured.
Figure 13-146
SSI Principle
13.3.1.2 EPOS2 Implementation
The EPOS2’s SSI interface uses DigOUT5 and DigOUT5/ as differential clock output and DigIN 9 and
DigIN 9/ as differential data input.
If the supply voltage of the SSI sensor is 5 V and the current is less than 150 mA, it can be directly supplied
from the +V AUX
signal (J5-9, respectively J5B-4). Otherwise, an external power supply must be connected
to power the sensor.
Figure 13-147
EPOS2 70/10 – SSI Encoder Connection
Figure 13-148
EPOS2 50/5 – SSI Encoder Connection
maxon motor control
EPOS2 Positioning Controllers Document ID: rel3956 13-191
EPOS2 Application Notes Collection Edition: April 2013
© 2013 maxon motor. Subject to change without prior notice.