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)： 10/21頁(yè)
文件大?。?/td> 170K
代理商： TMC239-SA
TMC239 DATA SHEET (V1.00 / Apr. 24th, 2003)
10
Copyright 2002, TRINAMIC Microchips GmbH
Blank time
The TMC239 uses a digital blanking pulse for the current chopper comparators. This prevents current
spikes, which can occur during switching action due to capacitive loading, from terminating the
chopper cycle. The lowest possible blanking time gives the best results for microstepping: A long blank
time leads to a long minimum turn-on time, thus giving an increased lower limit for the current. Please
remark, that the blank time should cover both, switch-off time of the lower side transistors and turn-on
time of the upper side transistors plus some time for the current to settle. Thus the complete switching
duration should never exceed 1.5μs. With slow external power stages it will become necessary to add
additional RC-filtering for the sense resistor inputs.
The TMC239 allows to adapt the blank time to the load conditions and to the selected slope in four
steps:
Blank time settings
BL2
BL1
Typical blank time
GND
GND
VCC
VCC
GND 0.6 μs
VCC 0.9 μs
GND 1.2 μs
VCC 1.5 μs
Standby and shutdown mode
The circuit can be put into a low power standby mode by the user, or, automatically goes to standby on
Vcc undervoltage conditions. Before entering standby mode, the TMC239 switches off all power
transistors, and holds their gates in a disable condition using high ohmic resistors. In standby mode the
oscillator becomes disabled and the oscillator pin is held at a low state. The standby mode is available
via the interface in SPI-mode and via the ENN pin in non-SPI mode.
The shutdown mode can only be entered in SPI-mode using the ENN pin. In shutdown all internal
reference voltages also become switched off and the SPI circuit is held in reset.
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