TMC246 DATA SHEET (V2.01 / Sep. 14th, 2005)
7
Copyright © 2005, TRINAMIC Motion Control GmbH & Co KG
Control via the SPI Interface
The SPI data word sets the current and polarity for both coils. By applying consecutive values,
describing a sine and a cosine wave, the motor can be driven in microsteps. Every microstep is
initiated by its own telegram. Please refer to the description of the analog mode for details on the
waveforms required. The SPI interface timing is described in the timing section. We recommend the
TMC428 to automatically generate the required telegrams and motor ramps for up to three motors.
Serial data word transmitted to TMC246
(MSB transmitted first)
Bit
Name
Function
Remark
11
MDA
mixed decay enable phase A
“1” = mixed decay
10
CA3
current bridge A.3
MSB
9
CA2
current bridge A.2
8
CA1
current bridge A.1
7
CA0
current bridge A.0
LSB
6
PHA
polarity bridge A
“0” = current flow from OA1 to OA2
5
MDB
mixed decay enable phase B
“1” = mixed decay
4
CB3
current bridge B.3
MSB
3
CB2
current bridge B.2
2
CB1
current bridge B.1
1
CB0
current bridge B.0
LSB
0
PHB
polarity bridge B
“0” = current flow from OB1 to OB2
Serial data word transmitted from TMC246
(MSB transmitted first)
Bit
Name
Function
Remark
11
LD2
load indicator bit 2
MSB
10
LD1
load indicator bit 1
9
LD0
load indicator bit 0
LSB
8
1
always “1”
7
OT
overtemperature
“1” = chip off due to overtemperature
6
OTPW
temperature prewarning
“1” = prewarning temperature exceeded
5
UV
driver undervoltage
“1” = undervoltage on VS
4
OCHS
overcurrent high side
3 PWM cycles with overcurrent within 63 PWM cycles
3
OLB
open load bridge B
no PWM switch off for 14 oscillator cycles
2
OLA
open load bridge A
no PWM switch off for 14 oscillator cycles
1
OCB
overcurrent bridge B low side
3 PWM cycles with overcurrent within 63 PWM cycles
0
OCA
overcurrent bridge A low side
3 PWM cycles with overcurrent within 63 PWM cycles
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