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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-pin D-type female connector X8. The encoder inputs (CHA, CHB and CHZ) accept differential
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, leave the 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 X8 includes a ‘Sense’ pin, which is used to
detect the voltage drop on long cable runs. This allows the MicroFlex e100 to increase the
encoder supply voltage on pin 12 to maintaina5Vsupply at the encoder (200 mA max).
Pin
Incremental encoder function
1 CHA+
2 CHB+
3 CHZ+
4 Sense
5 Hall U-
6 Hall U+
7 Hall V -
8 Hall V+
9 CHA-
10 CHB-
11 CHZ -
12 +5 V out
13 DGND
14 Hall W-
15 Hall W+
CHA-
CHA+
MicroFlex e100
MAX3096
Differential
line recei ver
to CPU
120R
to encoder signal l oss detec tion
DGND
1
9
Figure 12 - Encoder channel input circuit - Channel A shown
1
8
9
15
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