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L9942 Datasheet(PDF) 14 Page - STMicroelectronics

Part # L9942
Description  Integrated stepper motor driver for bipolar stepper motors with microstepping and programmable current profile
PDF  37 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9942 Datasheet(HTML) 14 Page - STMicroelectronics

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3 Electrical specifications
L9942
14/37
3.4.2
Over- and undervoltage detection
VS = 7 to 20 V, VCC = 3.0 to 5.3 V, EN=VCC, Tj = -40 to 150 °C, IREF = -200 µA, unless
otherwise specified. The voltages are referred to GND and currents are assumed positive,
when the current flows into the pin.
Table 8.
Over- and undervoltage detection .
Figure 6.
VS Monitoring
3.4.3
Reference Current Output
VS = 7 to 20 V, VCC = 3.0 to 5.3 V, EN=VCC, Tj = -40 to 150 °C, IREF = -200 µA, unless
otherwise specified. The voltages are referred to GND and currents are assumed positive,
when the current flows into the pin.
Table 9.
Reference Current Output
The device works properly without the external resistor at pin REF. In this case it doesn't have
to fullfill all specified parameters.
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
25
V
VSOV ON
VS OV-threshold voltage
VS decreasing
20
V
VSOV hyst
VS OV-hysteresis
VSOV OFF -VSOV ON
0.5
V
VPOR OFF
power-on-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
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
VREF
reference voltage range
IREF = -200 µA
1.05
1.25
1.45
V
IREFshorted
reference current
threshold shorted pin REF
register6 bit7 RERR = 1
-250
µA
IREFopen
reference current
threshold open pin REF
register6 bit7 RERR = 1
-150
µA
Register 7
UV
1
0
VS
VSUV ON
VSUV OFF
Register 7
OV
1
0
VS
VSOV OFF
VSOV ON



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