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4-2 Feedback MN1942

4.1.1 Incremental encoder feedback
The incremental encoder connections (ABZ channels and Hall signals ) are made using the
15-pinD-type female connec tor X8. The encoder inputs (CHA, CHB and CHZ) acceptdifferential
signals only. Twisted pairs must be used for each complementary signal pair e.g. CHA+ and
CHA-. The Hall inputs may be used as differential inputs (recommended for improved noise
immunity) or single ended inputs. When used as single ended inputs, leavethe Hall U-, Hall V-
and Hall W- pins unconnected. The overall cable shield (screen) must be connected to the
metallic shell of the D-type connector. Connector X8includes a ‘S ense’ pin, which is used to
detect the voltage drop on long cable runs. This allows the MicroFlex e100 to increase the
encoders upply voltage on pin 12 to maintain a 5V supply at the encoder (200mA max).
Pin Incrementalencoder function
1CHA+
2CHB+
3CHZ+
4Sense
5HallU-
6HallU+
7HallV-
8HallV+
9CHA-
10 CHB-
11 CHZ-
12 +5Vout
13 DGND
14 HallW-
15 HallW+
CHA-
CHA+
MicroFlexe100
MAX3096
Differential
linereceiver
toCPU
120R
toencoder signal loss detection
1nF
1nF
DGND
1
9
Figure12 - Encoder channel input circuit - Channel A shown
1
8
9
15