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PDF TC1040 Data sheet ( Hoja de datos )
| Número de pieza | TC1040 | |
| Descripción | Dual Low Power Comparator and Voltage Reference | |
| Fabricantes | Microchip Technology | |
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TC1040
Linear Building Block – Dual Low Power Comparator and
Voltage Reference with Shutdown
Features
• Combines Two Comparators and a 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, Operating: 10µA (Typ.)
Shutdown Mode: 6µA (Typ.)
• Rail-to-Rail Inputs and Outputs
• Operates Down to VDD = 1.8V
• Reference and One Comparator Remain Active in
Shutdown to Provide Supervisory Functions
Applications
• Power Supply Circuits
• Battery Operated Equipment
• Consumer Products
• Replacements for Discrete Components
Device Selection Table
Part Number
TC1040CEUA
Package
8-Pin MSOP
Temperature
Range
-40°C to +85°C
Package Type
8-Pin MSOP
OUTA 1
VSS 2
INA+ 3
INB- 4
8 OUTB
7 VDD
TC1040CEUA
6 REF
5 SHDN
General Description
The TC1040 is a mixed-function device combining two
comparators and a voltage reference in a single 8-pin
package. The inverting input of Comparator A and the
non-inverting input of Comparator B are internally
connected to the reference.
This increased integration allows the user to replace
two packages, which saves space, lowers supply
current and increases system performance. The
TC1040 operates from two 1.5V alkaline cells down to
VDD = 1.8V. It requires only 10µA typical of supply
current, which significantly extends battery life. A low
power shutdown input (SHDN) disables one of the
comparators, placing its outputs in a high-impedance
state. This mode saves battery power and allows
comparator outputs to share common analog lines
(multiplexing). Shutdown current is 6µA (typical).
Rail-to-rail inputs and outputs allow operation from low
supply voltages with large input and output signal
swings.
Packaged in an 8-Pin MSOP, the TC1040 is ideal for
applications requiring low power level detection.
Functional Block Diagram
OUTA 1
TC1040
8 OUTB
VSS 2
INA+ 3
INB- 4
AB
––
Voltage
Reference
VSS
7 VDD
6
REF
5
SHDN
© 2002 Microchip Technology Inc.
DS21345B-page 1
1 page  
4.2 Precision Battery Monitor
Figure 4-2 is a precision battery low/battery dead
monitoring circuit. Typically, the battery low output
warns the user that a battery dead condition is
imminent. Battery dead typically initiates a forced
shutdown to prevent operation at low internal supply
voltages (which can cause unstable system operation).
The circuit in Figure 4-2 uses a single TC1040, one-
half of a TC1029, and only six external resistors.
COMPA and COMPB provide precision voltage
detection using VR as a reference. Resistors R2 and
R4 set the detection threshold for BATT LOW, while
Resistors R1 and R7 set the detection threshold for
BATT FAIL. The component values shown assert
BATT LOW at 2.2V (typical) and BATT FAIL at 2.0
(typical). Total current consumed by this circuit is
typically 22µA at 3V. Resistors R5 and R6 provide
hysteresis for comparators COMPA and COMPB,
respectively.
4.3 External Hysteresis (Comparator)
Hysteresis can be set externally with two resistors
using positive feedback techniques (see Figure 4-3).
The design procedure for setting external comparator
hysteresis is as follows:
1. Choose the feedback resistor RC. Since the
input bias current of the comparator is at most
100pA, the current through RC can be set to
100nA (i.e., 1000 times the input bias current)
and retain excellent accuracy. The current
through RC at the comparator’s trip point is VR /
RC where VR is a stable reference voltage.
2. Determine the hysteresis voltage (VHY) between
the upper and lower thresholds.
TC1040
3. Calculate RA as follows:
EQUATION 4-1:
RA
=
R
C
-V----H----Y-
VD D
4. Choose the rising threshold voltage for VSRC
(VTHR).
5. Calculate RB as follows:
EQUATION 4-2:
RB = ----------------------------1------------------------------
----V----T----H---R------
VR × RA
–---1----
RA
–
---1----
RC
6. Verify the threshold voltages with these
formulas:
VSRC rising:
EQUATION 4-3:
VTHR
=
(VR)(RA)
--1----- + ---1---- + ---1----
RA RB RC
VSRC falling:
EQUATION 4-4:
VTHF = VTHR –
R-----A----×-----V----D----D--
RC
© 2002 Microchip Technology Inc.
DS21345B-page 5
5 Page 
TC1040
Sales and Support
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom-
mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1. Your local Microchip sales office
2. The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
3. The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
New Customer Notification System
Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
2002 Microchip Technology Inc.
DS21345B-page 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet TC1040.PDF ] | |
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