參數(shù)資料
型號(hào)： TMC239-SA
廠商： Electronic Theatre Controls, Inc.
英文描述： High Current Microstep Stepper Motor Driver with protection / diagnosis and SPI Interface
中文描述： 大電流微步驅(qū)動(dòng)器，步進(jìn)電機(jī)保護(hù)/診斷和SPI接口
文件頁(yè)數(shù)： 21/21頁(yè)
文件大?。?/td> 170K
代理商： TMC239-SA
TMC239 DATA SHEET (V1.00 / Apr. 24th, 2003)
21
Copyright 2002, TRINAMIC Microchips GmbH
Application note: Extending the microstep resolution
For some applications it might be desired to have a higher microstep resolution, while keeping the
advantages of control via the serial interface. The following schematic shows a solution, which adds
two LSBs by selectively pulling up the SRA / SRB pin by a small voltage difference. It assumes a full
scale sense voltage of 340mV. The circuit still takes advantage of completely switching off of the coils
when the internal DAC bits are set to “0000”. This results in the following comparator trip voltages:
Current setting
(MSB first)
Trip voltage
0000xx
000111
000110
000101
000100
...
111101
111100
0 V
5.8 mV
11.5 mV
17.3 mV
23 mV
334.2 mV
340 mV
SPI bit
DAC bit
SPI bit
DAC bit
15
/B1
7
A2
14
/B0
6
PHA
13
/A1
5
MDB
12
/A0
4
B5
11
MDA
3
B4
10
A5
2
B3
9
A4
1
B2
8
A3
0
PHB
i
SPI is a trademark of Motorola
R
S
SRA
TMC236 /
TMC239
110R
4.7nF
opt.
74HC595
C1
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q7'
/MR
C2
/OE
SCK
SDI
SDO
CSN
+V
CC
DS1D
100K
/CS
SDI
SCK
SDO
Free for
second
TMC239
47K
47K
47K
/DACA.0
/DACA.1
/DACB.0
/DACB.1
Vcc = 5V
1/2 74HC74
C
D
Q
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