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MCP6541RT-E/OT Datasheet

  • MCP6541RT-E/OT

  • COMP, 1.6V, SINGLE, P-P, SOT23-5; Comparator Type:Sub-Microa...

  • 1139.80KB

  • 32页

  • Microchip   Microchip

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MCP6541/1R/1U/2/3/4
4.4
8
7
6
5
4
3
2
1
0
-1
-2
-3
V
DD
= 5.0V
V
IN
鈥?/div>
V
OUT
25
20
15
10
5
0
-5
-10
-15
-20
-25
-30
Input Voltage (10 mV/div)
Externally Set Hysteresis
Greater flexibility in selecting hysteresis (or input trip
points) is achieved by using external resistors.
Input offset voltage (V
OS
) is the center (average) of the
(input-referred) low-high and high-low trip points. Input
hysteresis voltage (V
HYST
) is the difference between
the same trip points. Hysteresis reduces output
chattering when one input is slowly moving past the
other and thus reduces dynamic supply current. It also
helps in systems where it is best not to cycle between
states too frequently (e.g., air conditioner thermostatic
control).
Output Voltage (V)
Hysteresis
Time (100 ms/div)
FIGURE 4-3:
The MCP6541/2/3/4
comparators鈥?internal hysteresis eliminates
output chatter caused by input noise voltage.
4.4.1
NON-INVERTING CIRCUIT
4.2
Push-Pull Output
Figure 4-4
shows a non-inverting circuit for single-
supply applications using just two resistors. The
resulting hysteresis diagram is shown in
Figure 4-5.
V
DD
V
REF
-
MCP654X
+
V
IN
R
1
R
F
V
OUT
The push-pull output is designed to be compatible with
CMOS and TTL logic, while the output transistors are
configured to give rail-to-rail output performance. They
are driven with circuitry that minimizes any switching
current (shoot-through current from supply-to-supply)
when the output is transitioned from high-to-low, or from
low-to-high (see Figures 2-15, 2-18, 2-32 through 2-36
for more information).
4.3
MCP6543 Chip Select (CS)
The MCP6543 is a single comparator with Chip Select
(CS). When CS is pulled high, the total current
consumption drops to 20 pA (typ.); 1 pA (typ.) flows
through the CS pin, 1 pA (typ.) flows through the out-
put pin and 18 pA (typ.) flows through the V
DD
pin, as
shown in
Figure 1-1.
When this happens, the
comparator output is put into a high-impedance state.
By pulling CS low, the comparator is enabled. If the CS
pin is left floating, the comparator will not operate
properly.
Figure 1-1
shows the output voltage and
supply current response to a CS pulse.
The internal CS circuitry is designed to minimize
glitches when cycling the CS pin. This helps conserve
power, which is especially important in battery-powered
applications.
FIGURE 4-4:
Non-inverting circuit with
hysteresis for single-supply.
V
OUT
V
DD
V
OH
High-to-Low
V
OL
V
SS
V
SS
Low-to-High
V
IN
V
THL
V
TLH
V
DD
FIGURE 4-5:
Hysteresis Diagram for the
Non-Inverting Circuit.
The trip points for Figures 4-4 and 4-5 are:
EQUATION 4-1:
R1
鈳?/div>
鈳?/div>
鈳?/div>
R 1
鈳?/div>
-
-
V TLH = V REF
鈳?/div>
1 + ------
鈳?/div>
鈥?/div>
V OL
鈳?/div>
------
鈳?/div>
RF
鈳?/div>
鈳?/div>
鈳?/div>
R F
鈳?/div>
R1
鈳?/div>
鈳?/div>
鈳?/div>
R1
鈳?/div>
-
V THL = V REF
鈳?/div>
1 + ------
鈳?/div>
鈥?/div>
V OH
鈳?/div>
------
鈳?/div>
-
RF
鈳?/div>
鈳?/div>
鈳?/div>
R F
鈳?/div>
V
TLH
= trip voltage from low to high
V
THL
= trip voltage from high to low
漏
2006 Microchip Technology Inc.
DS21696E-page 15

MCP6541RT-E/OT 产品属性

  • Microchip

  • 校验器 IC

  • 1 Channel

  • Analog Comparators

  • Push-Pull

  • 7 mV

  • + 125 C

  • SMD/SMT

  • SOT-23

  • Reel

  • - 40 C

  • 3000

  • 5.5 V

  • 1.6 V

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