LMP7300MA Datasheet, PDF (11/17 Pages) Texas Instruments – Micropower Precision Comparator and Precision Reference with Adjustable Hysteresis

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V_OUT
1
OUTPUT
STATE
LMP7300
SNOSAT7F – AUGUST 2007 – REVISED MARCH 2013
0
V_IN
V_REF
Figure 16. Typical Configuration for No Hysteresis
Figure 18 shows the configuration with symmetric hysteresis when the HYSTP and HYSTN pins are connected
to the same voltage that is less than V_REF. The two trip points set a hysteresis band around the input threshold
voltage V_REF, such that the positive band is equal to the negative band.
This configuration controls the false triggering mentioned in Figure 16. Symmetric hysteresis values less than 5
mV to 10 mV are recommended for precise level detection applications.
V⁺
+ ^VIN
-
INP
INN
HYSTP
HYSTN
V_REF
R₁
2.45 k:
1%
R₂
1 M:
1%
+
-
GND _V+
2.048V
R_PULLUP
1 M:
OUT
GND
Figure 17. Symmetric Hysteresis ±5 mV
V_OUT
1
OUTPUT
STATE
10 mV
0
V_IN
V_IL
V_REF V_IH
Figure 18. Symmetric Hysteresis ±5 mV
Figure 20 shows the case for negative hysteresis by biasing only the HYSN pin to a voltage less than V_REF.
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