Voltage Supervision at the V
DD
Terminal
7
TPS3801/09 – Smallest SVS for Monitoring DSPs and Processors
Table 4. The Specified Values of V
IT–
and the Hysteresis, V
hys
DEVICES
VIT– – MIN
VIT– – TYP
VIT– – MAX
Vhys – TYP
TPS3801I50
TPS3809I50
4.45 V
4.55 V
4.65 V
60 mV
TPS3801K33
TPS3809K33
2.87 V
2.93 V
2.99 V
40 mV
TPS3801L30
TPS3809L30
2.58 V
2.64 V
2.70 V
35 mV
TPS3801J25
TPS3809J25
2.20 V
2.25 V
2.30 V
30 mV
3.2
Measurement of a Voltage Drop on the Supply Line
To demonstrate the typical operation of an SVS the following measurement has
been made. The measurement circuit of Figure 7 has been used.
Waveform
Generator
100 nF
VDD
GND
MR
RES
TPS3801–50
Oscilloscope
39 nF
1 M
Ω
Figure 7. Measurement Circuit for Measuring the Reaction of a Voltage Drop
The waveform generator supplies the supervisor and generates the voltage drop
to trigger a reset pulse. The 1 M
Ω
resistor and the 39 pF capacitor are to simulate
a CMOS load. The 100 nF capacitor at the V
DD
pin of the TPS3801 is
recommended for all applications. The oscilloscope records the measurement
data for the plot.
Содержание TPS3801
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