TMC423_1 TRINAMIC [TRINAMIC Motion Control GmbH & Co. KG.], TMC423_1 Datasheet - Page 11

• Manufacturer Part Number: TMC423_1
• Description: Serial Triple Incremental Encoder Interface
• Manufacturer: TRINAMIC [TRINAMIC Motion Control GmbH & Co. KG.]

TMC423 Data Sheet – (V1.13 / June 20
4 Dynamic Resolution Adaptation
The dynamic resolution adaptation is needed to link stepper motors and encoders with different
resolutions. The characteristics of the connected hardware must provided to the TMC423 by sending
the corresponding SPI telegram. (See 5.3.1 Overview on page 13 in this issue). The TMC423 multiplies
the encoder counter by a user selectable value in the range 1..1024, and then divides it by 16. When
using incremental encoders with N channel it is also possible to select between different behaviors
when the N channel is triggered.
Table 4 shows a number of prescaler factors for possible combinations of micro step resolution and
encoder resolution. Note: The given number of pulses have to be multiplied by four since 4-times
encoder signal evaluation is used. (See Figure 10: Encoder Output and Evaluation on page 14).
Microstep
s
12800
6400
3200
1600
800
400
Copyright © 2004 TRINAMIC Motion Control GmbH & Co. KG
1.5625
3.125
1024
----
----
----
----
Stepper Motor:
Resolution: e.g.: 12800 steps / rotation
Table 4: Prescaler factors for different motors and encoders
1000
3.2
1.6
----
----
----
----
Stepper
motor
1.5625
Encoder:
Resolution: e.g.: 1000 steps / rotation
3.125
6.25
512
----
----
----
Figure 6: TMC423 Application
th
Encoder Resolution [Pulses / Rotation]
, 2007)
500
6.4
3.2
1.6
----
----
----
TMC423
1.5625
3.125
12.5
6.25
256
----
----
TMC423:
Prescaler = 3.2 -> 1000* 4 * 3.2 = 12800
12.8
250
6.4
3.2
1.6
----
----
SPI Interface
200
----
16
8
4
2
1
25.6
12.8
125
6.4
3.2
1.6
----
50
64
32
16
8
4
2
11/22
----
25
64
32
16
8
4