TMC457_1 TRINAMIC [TRINAMIC Motion Control GmbH & Co. KG.], TMC457_1 Datasheet - Page 26

• Manufacturer Part Number: TMC457_1
• Description: S-profile motion controller with PID feedback control and high resolution micro stepping sequencer for stepper motors and piezo motors
• Manufacturer: TRINAMIC [TRINAMIC Motion Control GmbH & Co. KG.]

TMC457 DATASHEET (V. 1.16 / 2009-Nov-25)
Sine Wave Look-Up Table (LUT) Port Register
6.2.3
The units of a TMC457 register content are written as register[457].
Parameter vs. Units
Copyright © 2009 TRINAMIC Motion Control GmbH & Co. KG
R/W
W
R
micro step resolution USR
(used U instead of µ for
ramp_steps[457] = rs
Parameter / Symbol
acceleration a[Hz/s]
a[FS/^2] @ USR
Real World Units vs. Units of the TMC457
v[FS] @ USR
velocity v[Hz]
0x7F
0xFF
Addr
f
micro)
CLK
US
FS
s
[Hz]
31…16
31…16
15…0
15…0
Bits
Register
RAM
RAM
microsteps / s^2
microsteps / s
microstep
fullstep
US/s^2
READ (data D of last A)
WRITE
counts
US/s
[457]
Unit
[Hz]
[s]
Description
clock frequency of the TMC457 in [Hz]
second
v[Hz] = v[457] * ( 2 * f
a[Hz/s] = a[457] * f
micro step resolution in number of microsteps
(i.e. the number of microsteps between two
fullsteps)
v[FS/s] = v[US/2] / USR
USR  microstep resolution
a[FS/s^2] = a[US/s] / USR
rs = 2 * (v[457])^2 / (a[457]) / 2^18
micro steps during linear acceleration ramp
(if v_max is really reached during acceleration)
calculation / description / comment
CLK
CLK
[Hz]^2 / (16*256) / 2^30
(data of this address come
[Hz] / 2^31 )
xxxxDDDDDDDDDDDD
xxxxDDDDDDDDDDDD
xxxAAAAAAAAAAAAA
xxxAAAAAAAAAAAAA
Range
on next read)
26