TMC428 ETC-unknow, TMC428 Datasheet - Page 31

• Manufacturer Part Number: TMC428
• Description: Intelligent Triple Stepper Motor Controller With Serial Peripheral Interfaces
• Manufacturer: ETC-unknow

TMC428 DATA SHEET (V. 1.00 / February 12, 2001)
Stepper Motor Driver Datagram Configuration
Different control signals are required to drive 2-phase stepper motors. What kind of signals are required,
depends on the choice of stepping mode– full step, half step, micro step – and on additional options
proposed by the used stepper motor driver chips. So, the TMC428 primarily provides a full set of control
signals individually for each of the up to three stepper 2-phase stepper motors respectively stepper motor
driver chips of the daisy chain. Mnemonics for primary signal codes are given in Table 13.
The control signals for each of the two coils of a 2-phase stepper motor are 6 bits for a DAC controlling
the current of a coil, a phase polarity bit, and a fast decay bit for those stepper motor driver chips with a
fast decay feature for the coil current. These signals are available individually for each coil (COIL A and
COIL B). Fixed configuration bits– for example to select a current range of a driver –are proposed (named
Zero and One). Additionally, step and direction bits are provided. One unique 5 bit code word– named
primary signal code –is assigned to each primary control signal (see Table 13).
DAC_A_0
DAC_A_1
DAC_A_2
DAC_A_3
DAC_A_4
DAC_A_5
PH_A
FD_A
DAC_B_0
DAC_B_1
DAC_B_2
DAC_B_3
DAC_B_4
DAC_B_5
PH_B
FD_B
Zero
One
Direction
Step
Table 13 - Primary Signal Codes
Copyright © 2000, TRINAMIC Microchips GmbH
TRINAMIC
M I C R O C H I P S
may be used
(these codes
MNEMONIC
for future
UNUSED
devices)
PRIMARY SIGNAL CODE
$0A
$0D
$1A
$1D
hex
$00
$01
$02
$03
$04
$05
$06
$07
$08
$09
$0B
$0C
$0E
$10
$11
$12
$13
$14
$15
$16
$17
$18
$19
$1B
$1C
$1E
$0F
$1F
%00000
%00001
%00010
%00011
%00100
%00101
%00110
%00111
%01000
%01001
%01010
%01011
%01100
%01101
%01110
%01111
%10000
%10001
%10010
%10011
%10100
%10101
%10110
%10111
%11000
%11001
%11010
%11011
%11100
%11101
%11110
%11111
bin
DAC A, bit 0 (LSB)
DAC A, bit 1
DAC A, bit 2
DAC A, bit 3
DAC A, bit 4
DAC A, bit 5 (MSB)
phase polarity bit A
fast decay bit A
DAC B, bit 0 (LSB)
DAC B, bit 1
DAC B, bit 2
DAC B, bit 3
DAC B, bit 4
DAC B, bit 5 (MSB)
phase polarity bit B
fast decay bit B
constant ‘0’
constant ‘1’
0 : up / 1 : down resp. counter clockwise / clockwise
step bit for step/direction control of drivers
‘1’ for TMC428-I, TMC428-A, TMC428-PI24
FUNCTION
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