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TC1031 데이터시트(HTML) 5 Page - Microchip Technology

부품명 TC1031
상세내용  Linear Building Block - Low Power Voltage Reference with Programmable Hysteresis Comparator and Shutdown
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제조사  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
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TC1031 데이터시트(HTML) 5 Page - Microchip Technology

 
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© 2005 Microchip Technology Inc.
DS21342C-page 5
TC1031
3.0
DETAILED DESCRIPTION
The TC1031 is one of a series of very low-power, linear
building block products targeted at low-voltage, single-
supply applications. Minimum operating voltage for the
device is 1.8V, and typical supply current is only 6
μA
(fully enabled). It combines one comparator and a
voltage reference in a single package. The comparator
and reference outputs are in a high-impedance state
during shutdown.
3.1
Comparator
The TC1031 contains one comparator with program-
mable hysteresis. The range of the inputs extends
beyond both supply voltages by 200mV. The compara-
tor outputs will swing to within several millivolts of the
supplies depending on the load current being driven.
The comparator exhibits a propagation delay and
supply current which is largely independent of supply
voltage. The low input bias current and offset voltage
make
it
suitable
for
high
impedance
precision
applications.
The comparator is disabled during shutdown and has
high-impedance output.
3.2
Voltage Reference
A 2.0% tolerance, internally biased, 1.20V bandgap
voltage reference is included in the TC1031. It has a
push-pull output capable of sourcing and sinking at
least 50
μA. The voltage reference is disabled during
shutdown, with a high-impedance output.
3.3
Shutdown Input
SHDN at VIL disables both the comparator and voltage
reference and reduces the supply current to less than
0.1
μA. The SHDN input cannot be allowed to float;
when not used, connect it to VDD. The outputs are in a
high impedance state when the TC1031 is disabled.
The comparator’s inputs and output can be driven from
rail-to-rail by an external voltage when the TC1031 is
disabled. No latchup will occur when the device is
driven to its enabled state when SHDN is set to VIH.
3.4
Programmable Hysteresis
Hysteresis is added to the comparators by connecting
a resistor R1 between the VREF and HYST pins and
another resistor R2 between the HYST pin and VSS.
For no hysteresis VREF should be directly connected to
HYST. The hysteresis, VHB, is equal to twice the
voltage difference between the VREF and HYST pins,
where:
and is symmetrical around the normal (without
hysterersis)
threshold
of
the
comparator.
The
maximum voltage allowed between the VREF and HYST
pins is 80mV, giving a maximum hysteresis of 160mV.
FIGURE 3-1:
TC1031 PROGRAMMABLE HYSTERESIS
VHB = 2 * VREF * R1/(R1 + R2) (See Figure 3-1)
VREF
HYST
VSS
TC1031
6
5
1
R1
R2
IREF
R1 =
VHB
(2) (IREF)
R2 =
IREF
(1.200V –
)
VHB
2
Note: Size R1 and R2 such that IREF ≤ 50µA


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