參數(shù)資料
型號(hào)： TC1041CEUA
廠商： Microchip Technology Inc.
英文描述： Linear Building Block . Dual Low Power Comparator and Voltage Reference with Programmable Hysteresis
中文描述： 線性積木。雙低功率比較器和可編程參考電壓遲滯
文件頁(yè)數(shù)： 4/14頁(yè)
文件大小： 443K
代理商： TC1041CEUA
TC1041
DS21346B-page 4
2002 Microchip Technology Inc.
3.0
DETAILED DESCRIPTION
The TC1041 is one of a series of very low power, linear
building
block products
operation. The TC1041 contains two comparators and
a voltage reference and operates at a minimum supply
voltage of 1.8V with a typical current consumption of
10
μ
A.
Both
comparators
hysteresis.
targeted at low voltage
have
programmable
3.1
Comparator
The TC1041 contains two comparators with program-
mable
hysteresis.
The
comparators are connected to the output of the voltage
reference, while the range of the non-inverting inputs
extend beyond both supply voltages by 200mV. The
comparator outputs will swing to within several
millivolts of the supplies depending on the load current
being driven.
inverting
inputs
of
the
The comparators exhibit a propagation delay and
supply current which are largely independent of supply
voltage. The low input bias current and offset voltage
make them suitable for high impedance precision
applications.
3.2
Voltage Reference
A 2.0 percent tolerance, internally biased, 1.20V band-
gap voltage reference is included in the TC1041. It has
a push-pull output capable of sourcing and sinking at
least 50
μ
A.
3.3
Programmable Hysteresis
Hysteresis is added to the comparators by connecting
a resistor, R1, between the V
REF
and HYST pins and
another resistor, R2, between the HYST pin and V
SS
.
For no hysteresis, V
REF
should be directly connected to
HYST. The hysteresis, V
HB
, is equal to twice the
voltage difference between the V
REF
and HYST pins
where:
and
hysterersis)
maximum voltage allowed between the V
REF
and H
YST
pins is 80mV, giving a maximum hysteresis of 160mV.
is symmetrical around the
threshold
normal (without
comparator.
of
the
The
FIGURE 3-1:
TC1041 PROGRAMMABLE HYSTERESIS
V
HB
= 2V
REF
R1/(R1 + R2) (See Figure 3-1)
V
REF
HYST
V
SS
TC1041
6
5
1
R1
R2
I
REF
R1 =
V
HB
(2) (I
REF
)
(
1.2V
–
)
R2 =
I
REF
V
HB
2
Note:
Size R1 and R2 such that I
REF
≤
50μA
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