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參數資料
| 型號： | 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： | 大電流微步驅動器，步進電機保護/診斷和SPI接口 |
| 文件頁數： | 8/21頁 |
| 文件大小： | 170K |
| 代理商： | TMC239-SA |
TMC239 DATA SHEET (V1.00 / Apr. 24th, 2003)
8
Copyright 2002, TRINAMIC Microchips GmbH
Typical winding current values
Current setting
CA3..0 / CB3..0
Percentage of
current
Typical trip voltage of the current sense comparator
(internal reference or analog input voltage of 2V is used)
0000
0001
0010
...
1110
1111
0%
6.7%
13.3%
...
93.3%
100%
0 V
23 mV
45 mV
317 mV
340 mV
(bridge continuously in slow decay condition)
The current values correspond to a standard 4 Bit DAC, where 100%=15/16. The contents of all
registers is cleared to “0” on power-on reset or disable via the ENN pin, bringing the chip to a low
power standby mode. All SPI inputs have Schmitt-Trigger function.
Base current control via INA and INB
In SPI mode, the chip can use an external reference voltage for each DAC. This allows the adaptation
to different motors. This mode is enabled by tying pin ANN to GND. A 2.0V input voltage gives full
scale current of 100%. In this case, the typical trip voltage of the current sense comparator is
determined by the input voltage and the DAC current setting (see table above) as follows:
V
TRIP,A
= 0.17 V
INA
×
“percentage SPI current setting A”
V
TRIP,B
= 0.17 V
INB
×
“percentage SPI current setting B”
A maximum of 3.0V V
IN
is possible. Multiply the percentage of base current setting and the DAC table
to get the overall coil current. It is advised to operate at a high base current setting, to reduce the
effects of noise voltages. This feature allows a high resolution setting of the required motor current
using an external DAC or PWM-DAC.
Controlling the power down mode via the SPI interface
Programming current value “0000” for both coils at a time clears the overcurrent flags and switches the
TMC239 into a low current standby mode with coils switched off.
Open load detection
Open load is signaled, whenever there are more than 14 oscillator cycles without PWM switch off. Note
that open load detection is not possible while coil current is set to “0000”, because the chopper is off in
this condition. The open load flag will then always be read as inactive (“0”). During overcurrent
conditions, the open load flags also become active!
Overcurrent protection and diagnosis
The TMC239 uses the current sense resistors on the low side to detect an overcurrent: Whenever a
voltage above 0.61V is detected, the PWM cycle is terminated at once and all transistors of the bridge
are switched off for the rest of the PWM cycle. The error counter is increased by one. If the error
Standard
function
Control
word
function
11
MxA
10
CA3
9
CA2
6
PhA
-
0
-
-
-
Bit
Enable standby mode and
clear error flags
8
CA1
7
CA0
5
MxB
4
CB3
3
CB2
0
PhB
2
CB1
1
CB0
0
0
0
0
0
0
0
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