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L9942 Datasheet(PDF) 17 Page - STMicroelectronics

Part # L9942
Description  Integrated stepper motor driver for bipolar stepper motors with microstepping and programmable current profile
PDF  40 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9942 Datasheet(HTML) 17 Page - STMicroelectronics

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L9942
Electrical specifications
Doc ID 11778 Rev 7
17/40
3.4.2
Over- and undervoltage detection
Figure 6.
VS monitoring
3.4.3
Reference current output
The device works properly without the external resistor at pin REF. In this case it doesn't
have to fulfill all specified parameters.
Table 9.
Over- and undervoltage detection
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
VSUV ON
VS UV-threshold voltage
VS increasing
-
-
6.90
V
VSUV OFF
VS UV-threshold voltage
VS decreasing
4.8
-
-
V
VSUV hyst
VS UV-hysteresis
VSUV ON -VSUV OFF
-0.3
-
V
VSOV OFF
VS OV-threshold voltage
VS increasing
-
21
25
V
VSOV ON
VS OV-threshold voltage
VS decreasing
18.5
20
-
V
VSOV hyst
VS OV-hysteresis
VSOV OFF -VSOV ON
-0.5
-
V
VPOR OFF Power-off-reset threshold
VCC increasing
-
2.6
2.9
V
VPOR ON
Power-on-reset threshold
VCC decreasing
2.00
2.3
-
V
VPOR hyst
Power-on-reset hysteresis
VPOR OFF -VPOR ON
-0.11
-
V
Register 7
UV
1
0
VS
VSUV ON
VSUV OFF
Register 7
OV
1
0
VS
VSOV OFF
VSOV ON
Table 10.
Reference current output
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
VREF
Reference voltage range
IREF = -200 A
1.05
1.25
1.45
V
IREFshorted
Reference current
threshold shorted pin REF
register6 bit7 RERR = 1
-
-
-250
A
IREFopen
Reference current
threshold open pin REF
register6 bit7 RERR = 1
-150
-
-
A



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