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PDF TC1031 Data sheet ( Hoja de datos )
| Número de pieza | TC1031 | |
| Descripción | Low Power Voltage Reference | |
| Fabricantes | Microchip Technology | |
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TC1031
Linear Building Block – Low Power Voltage Reference with
Programmable Hysteresis Comparator and Shutdown
Features
• Combines Comparator and Voltage Reference in
a Single Package
• Optimized for Single Supply Operation
• Small Package: 8-Pin MSOP
• Ultra Low Input Bias Current: Less than 100pA
• Low Quiescent Current, Active: 6µA (Typ.),
Shutdown Mode: 0.1µA (Typ.)
• Rail-to-Rail Inputs and Outputs
• Operates Down to VDD = 1.8V
• Programmable Hysteresis
Applications
• Power Management Circuits
• Battery Operated Equipment
• Consumer Products
Device Selection Table
Part Number
TC1031CEUA
Package
8-Pin MSOP
Temperature
Range
-40°C to +85°C
Package Type
8-Pin MSOP
VSS 1
SHDN 2
INA+ 3
INA- 4
8 OUT
7 VDD
TC1031CEUA 6 VREF
5 HYST
General Description
The TC1031 is a low-power comparator and voltage
reference designed specifically for low-power applica-
tions. The TC1031 is designed for operation from a
single supply, however operation from dual supplies is
also possible. The power supply current drain is
independent of the magnitude of the power supply
voltage. The TC1031 can operate from two 1.5V
alkaline cells, and operation is ensured to VDD = 1.8V.
Typical active supply current is 6µA. Rail-to-rail inputs
and outputs allow operation from low supply voltages
with large input and output signal swings.
The TC1031 provides a simple method for adding user-
adjustable hysteresis without feedback or complex
external circuitry. Hysteresis is adjusted with a simple
resistor divider on the HYST input. A shutdown input,
SHDN, disables the comparator and voltage reference
and reduces supply current to less than 0.1µA
(maximum) when taken low.
The TC1031 is packaged in a space-saving 8-Pin
MSOP, making it ideal for applications requiring high
integration, small size and low power.
Functional Block Diagram
1
VSS
TC1031
8 OUT
SHDN 2
IN+ 3
IN- 4
–
Voltage
Reference
7 VDD
6
VREF
5
HYST
© 2002 Microchip Technology Inc.
DS21342B-page 1
1 page  
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 6µA
(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 50µA. 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
0.1µA. 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:
VHB = 2 * VREF * R1/(R1 + R2) (See Figure 3-1)
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
R1
IREF
6 VREF
5
HYST
R1 = VHB
(2) (IREF)
( )1.200V – VHB
R2 =
2
IREF
R2
1
VSS
TC1031
Note: Size R1 and R2 such that IREF ≤ 50µA
4.0 TYPICAL APPLICATIONS
The TC1031 lends itself to a wide variety of
applications, particularly in battery-powered systems. It
typically finds application in power management,
processor supervisory and interface circuitry.
© 2002 Microchip Technology Inc.
DS21342B-page 5
5 Page 
TC1031
Information contained in this publication regarding device
applications and the like is intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect
to the accuracy or use of such information, or infringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip’s products as critical com-
ponents in life support systems is not authorized except with
express written approval by Microchip. No licenses are con-
veyed, implicitly or otherwise, under any intellectual property
rights.
Trademarks
The Microchip name and logo, the Microchip logo, FilterLab,
KEELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER,
PICSTART, PRO MATE, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip Tech-
nology Incorporated in the U.S.A. and other countries.
dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, microPort,
Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM,
MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode
and Total Endurance are trademarks of Microchip Technology
Incorporated in the U.S.A.
Serialized Quick Turn Programming (SQTP) is a service mark
of Microchip Technology Incorporated in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2002, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
© 2002 Microchip Technology Inc.
Microchip received QS-9000 quality system
certification for its worldwide headquarters,
design and wafer fabrication facilities in
Chandler and Tempe, Arizona in July 1999
and Mountain View, California in March 2002.
The Company’s quality system processes and
procedures are QS-9000 compliant for its
PICmicro® 8-bit MCUs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals,
non-volatile memory and analog products. In
addition, Microchip’s quality system for the
design and manufacture of development
systems is ISO 9001 certified.
DS21342B-page 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet TC1031.PDF ] | |
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