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參數(shù)資料
| 型號： | E-L9935013TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 運動控制電子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 2.5 A, PDSO20 |
| 封裝： | ROHS COMPLIANT, POWER, MO-166, SOP-20 |
| 文件頁數(shù)： | 10/29頁 |
| 文件大小： | 311K |
| 代理商： | E-L9935013TR |
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Functional description
L9935
5.10.1
Over temperature pre alarm
Typically 20K before thermal shut down takes place an over temperature pre alarm (bit7 and
bit6 low) takes place. Typically over temperature pre alarm temperature is between 150°C
and 160°C.
5.11
Application hints using a high resistive stepper motor
The L9935 was originally targeted on stepper chopping stepper motor application with
typical resistances of 8..12
. Using motors with higher resistance will work too but diagnosis
behavior will slightly change. This paragraph shows the details that should be taken in
account using diagnosis for high resistive motors.
5.11.1
Startup behavior
The device has simple digital filter to avoid triggering diagnosis at a single event that could
be random noise. This digital filter needs 4 chopping pulses to settle. Using a high resistive
motor this chopping does not take place. Instead the digital filter samples each time a
polarity change takes place. So the first three response telegrams after reset may show an
’open load’ error.
H means check for HIGH at the error bits.
X means don’t care because filter is not yet settled.
Using 75mA chopping immediately after stand by:
The high resistive motor can be forced to chopping operation in the low current range. This
leads to the same behavior as using a low resistive motor.
Short to VS detection using high resistive motors:
The short to VS flag is overwritten each time the chopper comparator responds. Having
detected a short this flag only can be reset by reaching chopping operation or resetting the
circuit (ENN=1). For a high resistive motor this leads to the following consequence: Once a
short to VS is detected the error flag will persist even if the short is removed again until
either a reset (ENN=1) or chopping (for example in 75mA mode) has taken place. We
suggest to return to operation once a short to VS was detected by using the low current
mode to reset the flag.
Table 6.
High and low resistive motor (error bits)
Input data
High resistive motor
(error bits)
Low resistive motor
(error bits)
Standby
1st telegram (550mA or 900mA)
HH
Reverse phase (550mA or 900mA)
XH
HH
Reverse phase (550mA or 900mA)
XH
HH
Any data
XH
HH
Any data
HH
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