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TC1028
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: 10A (Typ.) Shutdown Mode: 0.05A (Typ.) * Rail-to-Rail Inputs and Outputs * Operates Down to VDD = 1.8V
General Description
The TC1028 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 TC1028 operates from two 1.5V alkaline cells down to VDD = 1.8V. It requires only 10A typical of supply current, which significantly extends battery life. A low power shutdown input (SHDN) disables the entire chip, placing all outputs in a high-impedance state. This mode saves battery power and allows comparator outputs to share common analog lines (multiplexing). Shutdown current is 0.05A 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 TC1028 is ideal for applications requiring low power level detection.
Applications
* * * * Power Supply Circuits Battery Operated Equipment Consumer Products Replacements for Discrete Components
Device Selection Table
Part Number TC1028CEUA Package 8-Pin MSOP Temperature Range -40C to +85C
Functional Block Diagram
OUTA 1
Package Type
8-Pin MSOP
OUTA VSS INA+ INB1 2 3 4 8 7 OUTB VDD REF SHDN
INBINA+ 3
TC1028
8
OUTB
VSS
2 A - - B
7
VDD
+
+
TC1031CEUA
6 Voltage Reference
6 5
REF
4 VSS
5
SHDN
2002 Microchip Technology Inc.
DS21339B-page 1
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TC1028
1.0 ELECTRICAL CHARACTERISTICS
*Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of the specifications is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability.
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage ......................................................6.0V Voltage on Any Pin .......... (V SS - 0.3V) to (VDD + 0.3V) Junction Temperature....................................... +150C Operating Temperature Range............. -40C to +85C Storage Temperature Range .............. -55C to +150C
TC1028 ELECTRICAL SPECIFICATIONS
:
Electrical Characteristics: Typical values apply at 25C and VDD = 3.0V. Minimum and maximum values apply for TA = -40 to +85C, and VDD = 1.8V to 5.5V, unless otherwise specified. Symbol VDD IQ ISHDN VIH VIL ISI Comparators ROUT COUT TSEL TDESEL VIR VOS IB VOH VOL CMRR PSRR ISRC Output Resistance in Shutdown Output Capacitance in Shutdown Select Time Deselect Time Input Voltage Range Input Offset Voltage Input Bias Current Output High Voltage Output Low Voltage Common Mode Rejection Ratio Power Supply Rejection Ratio Output Source Current 20 -- -- -- VSS - 0.2 -5 -5 -- VDD - 0.3 -- 66 60 1 -- -- 20 500 -- -- -- -- -- -- -- -- -- 5 -- -- VDD + 0.2 +5 +5 100 -- 0.3 -- -- -- M pF sec nsec V mV pA V V dB dB mA VDD = 3V, TA = 25C TA = -40C to 85C TA =25C, INA+, INB- = VDD to VSS RL = 10k to VSS RL = 10k to VDD TA = 25C, VDD = 5V VCM = VDD to VSS TA = 25C, VDD = 1.8V to 5V INA+ = VDD, INB- = VSS Output Shorted to VSS VDD = 1.8V INA+ = VSS, INB- = VDD Output Shorted to VDD VDD = 1.8V 100mV Overdrive, CL = 100pF 10mV Overdrive, C L = 100pF SHDN = VSS SHDN = VSS VOUT Valid from SHDN = VIH VOUT Invalid from SHDN = VIL RL =10k to VSS Parameter Supply Voltage Supply Current Operating Supply Current, Shutdown Input High Threshold Input Low Threshold Shutdown Input Current Min 1.8 -- -- 80% VDD -- -- Typ -- 10 0.05 -- -- -- Max 5.5 15 0.1 -- 20% VDD 100 Units V A A V V nA All outputs unloaded, SHDN = VDD SHDN = VSS Test Conditions
Shutdown Input
ISINK
Output Sink Current
2
--
--
mA
tPD1 tPD2 VREF IREF(SINK) CL(REF) ROUT(SD) COUT(SD)
Response Time Response Time Reference Voltage Sink Current Load Capacitance Output Resistance in Shutdown Output Capacitance in Shutdown
-- -- 1.176 50 50 -- 20 --
4 6 1.200 -- -- -- -- --
-- -- 1.224 -- -- 100 -- 5
sec sec V A A pF M pF
Voltage Reference IREF(SOURCE) Source Current
SHDN = VSS SHDN = VSS
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DS21339B-page 2
2002 Microchip Technology Inc.
TC1028
TC1028 ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics: Typical values apply at 25C and VDD = 3.0V. Minimum and maximum values apply for TA = -40 to +85C, and VDD = 1.8V to 5.5V, unless otherwise specified. Symbol TSEL TDESEL CL(REF) EVREF eVREF Parameter Select Time Deselect Time Load Capacitance Noise Voltage Noise Voltage Density Min -- -- -- -- -- Typ 200 10 -- 20 1.0 Max -- -- 100 -- -- Units sec sec pF VRMS V/Hz 100Hz TO 100kHz 1kHz Test Conditions REF Valid from SHDN = VIH RL = 100k to VSS REF Invalid from SHDN = VIL RL = 100k to VSS
2002 Microchip Technology Inc.
DS21339B-page 3
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TC1028
2.0 PIN DESCRIPTION
The description of the pins are listed in Table 2-1.
TABLE 2-1:
Pin No. (8-Pin MSOP) 1 2 3 4 5 6 7 8
PIN FUNCTION TABLE
Symbol OUTA VSS INA+ INBSHDN REF VDD OUTB Comparator output. Negative power supply. Non-inverting input to Comparator A. Inverting input to Comparator B. Shutdown input. Voltage reference. Positive power supply. Comparator output. Description
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DS21339B-page 4
2002 Microchip Technology Inc.
TC1028
3.0 DETAILED DESCRIPTION 4.0 TYPICAL APPLICATIONS
The TC1028 is one of a series of very low power, linear building block products targeted at low voltage, single supply applications. The TC1028 minimum operating voltage is 1.8V and typical supply current is only 10A (fully enabled). It combines two comparators and a voltage reference in a single package. The shutdown mode disables both comparators and the reference. All of the outputs are in a high impedance state during shutdown. The TC1028 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.
4.1
Wake-Up Timer
3.1
Comparators
The TC1028 contains two comparators. The comparator's input range extends beyond both supply voltages by 200mV and the outputs will swing to within several millivolts of the supplies depending on the load current being driven. The inverting input of Comparator A and the non-inverting input of Comparator B are internally connected the output of the voltage reference. 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. Both comparators are disabled during shutdown and have high impedance outputs.
Many microcontrollers have a low-power "sleep" mode that significantly reduces their supply current. Typically, the microcontroller is placed in this mode via a software instruction, and returns to a fully-enabled state upon reception of an external signal ("wake-up"). The wakeup signal is usually supplied by a hardware timer. Most system applications demand that this timer have a long duration (typically seconds or minutes), and consume as little supply current as possible. The circuit shown in Figure 4-1 is a wake-up timer made from Comparator A. Capacitor C1 charges through R1 until a voltage equal to V is reached, at which point the "wake-up" is driven active. Upon wakeup, the microcontroller resets the timer by forcing a logic low on a dedicated, open drain I/O port pin. This discharges C1 through R4 (the value of R4 is chosen to limit maximum current sunk by the I/O port pin). With a 3V supply, the circuit as shown consumes typically 10A and furnishes a nominal timer duration of 25 seconds.
3.2
Voltage Reference
A 2.0% tolerance, internally biased, 1.20V bandgap voltage reference is included in the TC1028. It has a push-pull output capable of sourcing and sinking 50A. The voltage reference is disabled during shutdown, with a high impedance output.
FIGURE 4-1:
R4
WAKE-UP TIMER
Microcontroller I/O* VDD 1/2 VDD COMPA +
3.3
Shutdown Input
C1 10F
R1 5M
SHDN at VIL disables the entire part. The SHDN input cannot be allowed to float; when not used, connect it to VDD. All outputs are in a high impedance state when shutdown is active. The disabled comparators' inputs and outputs can be driven from rail-to-rail by an external voltage when the TC1028 is in shutdown. No latchup will occur when the device is driven to its enabled state when SHDN is set to VIH.
Wake-Up - VR
TC1028
*Open Drain Port Pin
2002 Microchip Technology Inc.
DS21339B-page 5
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TC1028
4.2 Precision Battery Monitor
3. Calculate RA as follows: 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 TC1028, a TC1034, 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 R3 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 16A at 3V. Resistors R5 and R6 provide hysteresis for comparators COMPA and COMPB, respectively.
EQUATION 4-1:

VH Y R A = R C ---------VD D 4. 5.

Choose the rising threshold voltage for VSRC (VTHR). Calculate RB as follows:
EQUATION 4-2:
1 R B = ---------------------------------------------------------V THR 1-1 -------------------- - ------ ------V R x R A R A RC 6. Verify the formulas: VSRC rising: threshold

voltages
with
these
4.3
External Hysteresis (Comparator)
1.
2.
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DS21339B-page 6
2002 Microchip Technology Inc.

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. Determine the hysteresis voltage (VHY) between the upper and lower thresholds.
VSRC falling:
EQUATION 4-4:
V THF = V THR - R A x V DD -----------------------RC

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:
EQUATION 4-3:
1 1 1 V TH R = ( V R ) ( R A ) ------ + ------- + ------RA RB RC
TC1028
FIGURE 4-2: PRECISION BATTERY MONITOR
To System DC/DC Converter VDD TC1034 + AMP1 - R2, 330k, 1% + COMPA - BATTLOW R4, 470k, 1% R5, 7.5M VDD
3V Alkaline
+ VDD
TC1028
R1, 270k, 1% VR - COMPB + BATTFAIL
R6, 7.5M R3, 470k, 1%
FIGURE 4-3:
COMPARATOR EXTERNAL HYSTERESIS CONFIGURATION
RC
TC1028
RA VSRC
VDD + - COMPA 1/2
VOUT
RB VR
2002 Microchip Technology Inc.
DS21339B-page 7
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TC1028
5.0
Note:
TYPICAL CHARACTERISTICS
The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
Comparator Propagation Delay vs. Supply Voltage
7 DELAY TO RISING EDGE (sec) 6 Overdrive = 10mV DELAY TO FALLING EDGE (sec)
TA = 25C CL = 100pF
Comparator Propagation Delay vs. Supply Voltage
7 6 DELAY TO RISING EDGE (sec)
TA = 25C CL = 100pF
Comparator Propagation Delay vs. Temperature
7 Overdrive = 100mV 6
Overdrive = 10mV
5 4
5 4 Overdrive = 100mV Overdrive = 50mV
5
VDD = 5V VDD = 4V
3 2 1.5 2 2.5 3
Overdrive = 50mV
3 2
4
VDD = 2V VDD = 3V
3 1.5 2 2.5 3 3.5 4 4.5 5 5.5 -40C 25C SUPPLY VOLTAGE (V)
3.5
4
4.5
5
5.5
85C
SUPPLY VOLTAGE (V)
TEMPERATURE (C)
Comparator Propagation Delay vs. Temperature
7 DELAY TO FALLING EDGE (sec) Overdrive = 100mV 6 VDD - VOUT (V)
VDD = 5V
Comparator Output Swing vs. Output Source Current
2.5 2.0
VDD = 3V VDD = 1.8V
TA = 25C
Comparator Output Swing vs. Output Sink Current
2.5 2.0 VOUT - VSS (V)
TA = 25C
5
VDD = 4V VDD = 3V VDD = 2V
1.5 1.0
1.5 1.0
VDD = 3V VDD = 1.8V VDD = 5.5V
4
.5 0 25C TEMPERATURE (C) 85C 0 1
VDD = 5.5V
.5 0
3 -40C
3 2 4 ISOURCE (mA)
5
6
0
1
2
3
4
5
6
ISINK (mA)
60 TA = -40C 50 40 TA = 85C 30 20 Sinking 10 Sourcing 0 0 REFERENCE VOLTAGE (V) TA = 25C
1.240
VDD = 1.8V VDD = 3V VDD = 5.5V
SUPPLY AND REFERENCE VOLTAGES (V)
Comparator Output Short-Circuit Current vs. Supply Voltage
OUTPUT SHORT-CIRCUIT CURRENT (mA)
Reference Voltage vs. Load Current
Line Transient Response of VREF
4
VDD
1.220 1.200 1.180 1.160
VDD = 1.8V
3
Sinking
TA
=
-4
0
C
Sourcing
2
VREF
TA = 25C TA = 85C 6
VDD = 5.5V VDD = 3V
1
1.140 0 2 4
0 0 100 200 TIME (sec) 300 400
3 1 2 4 5 SUPPLY VOLTAGE (V)
6
8
10
LOAD CURRENT (mA)
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DS21339B-page 8
2002 Microchip Technology Inc.
TC1028
5.0 TYPICAL CHARACTERISTICS (CONTINUED)
Reference Voltage vs. Supply Voltage
1.25
REFERENCE VOLTAGE (V)
Supply Current vs. Supply Voltage
12 11 10 TA = 25C 9 8 7 TA = 85C TA = -40C
1.20
1.15
1.10
1.05 1 4 2 3 SUPPLY VOLTAGE (V) 5
SUPPLY CURRENT (A)
6 0 1 2 3 4 5 SUPPLY VOLTAGE (V) 6
2002 Microchip Technology Inc.
DS21339B-page 9
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TC1028
6.0
6.1
PACKAGING INFORMATION
Package Marking Information
Package marking data not available at this time.
6.2
Taping Form
Component Taping Orientation for 8-Pin MSOP Devices
User Direction of Feed
PIN 1
W
P Standard Reel Component Orientation for TR Suffix Device
Carrier Tape, Number of Components Per Reel and Reel Size
Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size
8-Pin MSOP
12 mm
8 mm
2500
13 in
6.3
Package Dimensions
8-Pin MSOP
PIN 1
.122 (3.10) .114 (2.90)
.197 (5.00) .189 (4.80)
.026 (0.65) TYP.
.122 (3.10) .114 (2.90) .043 (1.10) MAX. .016 (0.40) .010 (0.25) .006 (0.15) .002 (0.05)
6 MAX. .028 (0.70) .016 (0.40)
.008 (0.20) .005 (0.13)
Dimensions: inches (mm)
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DS21339B-page 10
2002 Microchip Technology Inc.
TC1028
Sales and Support
Data Sheets Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following: 1. 2. 3. Your local Microchip sales office The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277 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.
DS21339B-page11
TC1028
NOTES:
DS21339B-page12
2002 Microchip Technology Inc.
TC1028
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 components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, 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 Technology 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. (c) 2002, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved.
Printed on recycled paper.
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 (R) 8-bit MCUs, KEELOQ(R) 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.
2002 Microchip Technology Inc.
DS21339B-page 13
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03/01/02
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DS21339B-page 14
2002 Microchip Technology Inc.
*B93312SD*

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