MIC2779
Voltage Monitor with Adjustable Hysteresis
Features
General Description
• Optimized for PDAs, Cellular Telephones, Pagers,
and Other Battery-Powered Devices
• Independently Adjustable High- and Low-Voltage
Thresholds
• Internal Logic Prevents Battery Voltage
Fluctuation Chatter
• High ±2% Voltage Threshold Accuracy
• Built-In 140 ms (Minimum) Delay Deglitches
Output
• Extremely Low 1 µA Typical Supply Current
• For Applications that Require Open-Drain Output,
See MIC2778/MIC833
• Immune to Brief Power Supply Transients
• Available in 5-Lead SOT23 Package
The MIC2779 is a voltage monitor that is uniquely
designed to detect two separate voltage thresholds
combined with a delay generator and logic. It is
designed for monitoring the battery supply of portable
digital systems, particularly PDAs, pagers, and cellular
telephones.
Applications
•
•
•
•
•
•
PDAs
Pagers
Cordless Phones
Consumer Electronics
Embedded Controllers
Personal Electronics
High- and low-voltage thresholds can be adjusted
independently, allowing for wide hysteresis. Voltage
detection thresholds are accurate to 2%.
If the battery voltage falls below the low-voltage
threshold, the output /RST or RST is asserted and
latched, preventing system operation until the battery is
replaced or recharged. Internal logic prevents the
output from chattering due to battery recovery or load
removal. The output is asserted for 140 ms (minimum)
when a fresh battery is inserted. For applications
requiring open-drain output, see MIC2778/MIC833.
The IC’s power supply input is separate from the
detector inputs, allowing the MIC2779 to be powered
from a downstream supply, such a boost converter.
Supply current is extremely low (1 μA, typical), making
it ideal for portable applications. The MIC2779 is
supplied in a 5-lead SOT23 package.
Package Types
MIC2779H
SOT23-5 (M5)
(Top View)
MIC2779L
SOT23-5 (M5)
(Top View)
LTH GND HTH
LTH GND HTH
3
2
1
3
2
1
4
5
4
5
RST
VDD
/RST
VDD
2018 Microchip Technology Inc.
DS20006116A-page 1
MIC2779
Typical Application Circuit
Cellular Telephone Battery Monitor
VOUT
3.0V
MIC5207-3.0YM5
Li-Ion
Cell
Nȍ
MIC2779L
1%
VDD / R S T
LTH
Nȍ
1%
HTH
Nȍ
1%
IN
OUT
BYP
EN
470pF
4.7μF
GND
GND
VBAT(hi) = 3.6V
VBAT(lo) = 3.1V
Functional Block Diagram
VDD
VB A T T
Low-Voltage
Detect
VLO
LTH
High-Voltage
Detect
HTH
VHI
R Q
/RST*
S Q
RST*
One Shot
Delay
Line
1.24V
Bandgap
Reference
MIC2779
GND
* Pinout and polarity vary by device type.
See Product Identification System section.
DS20006116A-page 2
2018 Microchip Technology Inc.
MIC2779
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Supply Voltage (VDD) ................................................................................................................................... –0.3V to +7V
Input Voltages (VLTH, VHTH, V/RST, VRST) .................................................................................................... –0.3V to +7V
/RST, RST Output Current (I/RST, IRST)...................................................................................................................20 mA
Storage Temperature (TS)...................................................................................................................... –65°C to +150°C
ESD Rating (Note 1) .................................................................................................................................................. 2 kV
Operating Ratings ††
Supply Voltage (VDD, Note 2).................................................................................................................... +1.5V to +5.5V
Input Voltages (VLTH, VHTH, V/RST, VRST) ................................................................................................. –0.3V to +6.0V
Ambient Temperature Range (TA)............................................................................................................ –40°C to +85°C
Package Thermal Resistance
5-Ld SOT23 ........................................................................................................................................................256°C/W
† Notice: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of the device at those or any other conditions above those indicated
in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended
periods may affect device reliability.
†† Notice: The device is not guaranteed to function outside its operating ratings.
Note 1: Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5 kΩ in series with
100 pF.
2: VDD operating range is 1.5V to 5.5V. Output is guaranteed to be held low, down to VDD = 1.2V.
2018 Microchip Technology Inc.
DS20006116A-page 3
MIC2779
ELECTRICAL CHARACTERISTICS
Electrical Characteristics: 1.5V ≤ VDD ≤ 5.5V; TA = +25°C, bold values indicate –40°C ≤ TA ≤ +85°C, unless noted.
Parameter
Supply Current
Input Leakage Current
Sym.
Min.
Typ.
Max.
Units
IDD
—
1
2
µA
—
5
—
pA
—
—
10
nA
—
1.240
—
1.215
—
1.265
ILTH, IHTH
Conditions
/RST, RST not asserted
—
—
Reference Voltage
VREF
Propagation Delay
tD
—
5
—
µs
VLTH = VREF(MAX) +100 mV to VREF(MIN)
– 100 mV
Reset Pulse Width
tRESET
140
—
420
ms
—
—
—
0.3
Reset Output Low
Voltage
Reset Output High
Voltage
V
MIC2779H/L-2
/RST asserted or RST not asserted,
ISINK = 1.6 mA, VDD ≥ 1.6V
V
VOL
—
—
0.4
/RST asserted or RST not asserted,
ISINK = 100 µA, VDD ≥ 1.2V
0.8VDD
—
—
/RST not asserted or RST asserted,
ISOURCE = 500 µA, VDD ≥ 1.6V
0.8VDD
—
—
V
VOH
/RST not asserted or RST asserted,
ISOURCE = 50 µA, VDD ≥ 1.2V
Timing Diagram
A
VBATT
VHTH
VLTH
A
0V
V/RST
VOH
VOL
VRST
VOH
VOL
tRST
tRST
Propagation delays not shown for clarity. The MIC2779
ignores very brief transients. See the Application
Information section for details.
DS20006116A-page 4
2018 Microchip Technology Inc.
MIC2779
TEMPERATURE SPECIFICATIONS
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
Ambient Temperature Range
TA
–40
—
+85
°C
—
Storage Temperature Range
TS
–65
—
+150
°C
—
JA
—
256
—
°C/W
—
Temperature Ranges
Package Thermal Resistances
Thermal Resistance, SOT23-5
Note 1:
The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable
junction temperature and the thermal resistance from junction to air (i.e., TA, TJ, JA). Exceeding the
maximum allowable power dissipation will cause the device operating junction temperature to exceed the
maximum +85°C rating. Sustained junction temperatures above +85°C can impact the device reliability.
2018 Microchip Technology Inc.
DS20006116A-page 5
MIC2779
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
Pin Number
MIC2779H
PIN FUNCTION TABLE
Pin Number
MIC2779L
Pin Name
Description
High-Voltage Threshold (Input): Analog input to a comparator. When
the level on this pin initially rises above VREF, the delay generator
cycles and the /RST remains low or RST remains high for a minimum
of 140 ms.
1
1
HTH
2
2
GND
Ground.
LTH
Low-Voltage Threshold (Input): Analog input to a comparator. This is
the voltage monitor input assigned to detect a low voltage condition.
When the level on this pin falls below VREF, /RST or RST is asserted
and the condition is latched until VHTH > VREF.
RST
Reset (Output): Push-pull output. This output is asserted and latched
when VLTH < VREF, indicating a low voltage condition. This state
remains latched until VHTH > VREF. The polarity of this signal
(active-high or low) is determined by the part number suffix. See Product Identification System.
3
4
3
—
—
4
/RST
Reset (Output): Push-pull output. This output is asserted and latched
when VLTH < VREF, indicating a low voltage condition. This state
remains latched until VHTH > VREF. The polarity of this signal
(active-high or low) is determined by the part number suffix. See Product Identification System.
5
5
VDD
Power Supply (Input): Independent supply input for internal circuitry.
DS20006116A-page 6
2018 Microchip Technology Inc.
MIC2779
3.0
FUNCTIONAL DESCRIPTION
The MIC2779 monitors the voltage of a battery and
detects when it is discharged below a programmed
level. Upon being replaced, or being recharged above
a second higher programmed trip point, the output
remains low (MIC2779L) or high (MIC2779H) for a
minimum of 140 ms and then sends a reset signal to a
microprocessor or other downstream component. See
the Timing Diagram.
3.1
/RST, RST Low Output
The output is a push-pull logic signal that is asserted
when the MIC2779 detects a low input voltage. The
/RST output of MIC2779L is active-low; the RST output
of MIC2779H is active-high.
3.2
Trip Points
Battery voltage is monitored by a comparator via a
voltage divider network. The divided voltage is
compared to an internal reference voltage. When the
voltage at the LTH input pin drops below the internal
reference voltage, the output is asserted. At this point,
the voltage at HTH is assumed to be below the
reference voltage.
3.3
Delay
At power-on or when the battery is replaced or
recharged, and the voltage at HTH exceeds the
reference voltage, the output is deasserted after a
minimum delay of 140 ms.
2018 Microchip Technology Inc.
DS20006116A-page 7
MIC2779
4.0
APPLICATION INFORMATION
4.1
Programming the Thresholds
The low-voltage
Equation 4-1.
threshold
is
calculated
EQUATION 4-3:
1M
V BAT HI = 1.24 -------------
R3
using
R3 = 344k
EQUATION 4-1:
Once R3 is determined, the equation for VBAT(LO) can
be used to determine R2. A single lithium-ion cell
should not be discharged below 2.5V. Many
applications limit the drain to 3.1V. Using 3.1V for the
VBAT(LO) threshold allows one to calculate the values of
the two remaining resistor values.
R1 + R2 + R3
V BAT LO = V REF ---------------------------------
R2 + R3
Where:
VREF = 1.240V
The high-voltage
Equation 4-2.
threshold
is
calculated
using
EQUATION 4-4:
EQUATION 4-2:
1M
V BAT LO = 3.1V = 1.24 ------------------------------
R2 + 344k
R1 + R2 + R3
V BAT HI = V REF ---------------------------------
R3
R2 = 56k
Where:
VREF = 1.240V
R1 = 1M – R2 – R3
When working with large resistors, a small amount of
leakage current can cause voltage offsets that degrade
system accuracy. The maximum recommended total
resistance from VBAT to ground is 3 MΩ.
VB A T T
R 1 Nȍ
1%
R 2 Nȍ
1%
MIC2779
VDD / R S T
R ST
LTH
HTH
GND
R 3 Nȍ
1%
FIGURE 4-1:
Example Circuit.
Once the desired trip points are determined, set the
VBAT(HI) threshold first.
For example, use a total of 1 MΩ = R1 + R2 + R3. For
a typical single-cell lithium-ion battery, 3.6V is a good
“high threshold” because at 3.6V the battery is
moderately charged. Solving for R3:
DS20006116A-page 8
R1 = 600k
The accuracy of the resistors can be chosen based
upon the accuracy required by the system.
4.2
Input Transients
The MIC2779 is inherently immune to very short
negative going glitches. Very brief transients may
exceed the VBAT(LO) threshold without tripping the
output.
As shown in Figure 4-2, the narrower the transient, the
deeper the threshold overdrive that will be ignored by
the MIC2779. The graph represents the typical
allowable transient duration for a given amount of
threshold overdrive that will not generate a reset.
MAX. TRANSIENT DURATION (μs)
In order to provide the additional criteria needed to
solve for the resistor values, the resistors can be
selected such that they have a given total value, that is,
R1 + R2 + R3 = RTOTAL. A value such as 1 MΩ for
RTOTAL is a reasonable value because it draws
minimum battery current, but has no measurable effect
on accuracy.
140
120
100
80
60
40
20
0
1
10
100
1000
RESET COMP. OVERDRIVE, VREF –VLTH (mV)
FIGURE 4-2:
Input Transient Response.
2018 Microchip Technology Inc.
MIC2779
5.0
PACKAGING INFORMATION
5.1
Package Marking Information
5-Lead SOT23*
Example
XXXX
NNN
UPB1
288
Legend: XX...X
Y
YY
WW
NNN
e3
*
Product code or customer-specific information
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Pb-free JEDEC® designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator ( e3 )
can be found on the outer packaging for this package.
●, ▲, ▼ Pin one index is identified by a dot, delta up, or delta down (triangle
mark).
Note:
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information. Package may or may not include
the corporate logo.
Underbar (_) and/or Overbar (⎯) symbol may not be to scale.
2018 Microchip Technology Inc.
DS20006116A-page 9
MIC2779
5-Lead SOT23 Package Outline & Recommended Land Pattern
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging.
DS20006116A-page 10
2018 Microchip Technology Inc.
MIC2779
APPENDIX A:
REVISION HISTORY
Revision A (November 2018)
• Converted Micrel document MIC2779 to Microchip data sheet template DS20006116A.
• Minor grammatical text changes throughout.
• Removed all reference to the 1% accuracy part
option.
2018 Microchip Technology Inc.
DS20006116A-page 11
MIC2779
NOTES:
DS20006116A-page 12
2018 Microchip Technology Inc.
MIC2779
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, contact your local Microchip representative or sales office.
Examples:
Device
X
-X
X
XX
-XX
Part No.
Output
Polarity
Accuracy
Junction
Temp. Range
Package
Media Type
Device:
MIC2779:
Voltage Monitor with Adjustable Hysteresis
Output Polarity:
H = Active-High RST
L = Active-Low /RST
Accuracy:
-2 = Accurate to 2%
Junction
Temperature
Range:
Y
=
–40°C to +85°C, RoHS-Compliant
Package:
M5
=
5-Lead SOT23
Media Type:
TR
a) MIC2779H-2YM5-TR:
b) MIC2779L-2YM5-TR:
Note 1:
MIC2779, Active-High RST,
Accurate to 2%,
–40°C to +85°C Temperature
Range, 5-Lead SOT23,
3,000/Reel
MIC2779, Active-Low /RST,
Accurate to 2%,
–40°C to +85°C Temperature
Range, 5-Lead SOT23,
3,000/Reel
Tape and Reel identifier only appears in the
catalog part number description. This identifier is
used for ordering purposes and is not printed on
the device package. Check with your Microchip
Sales Office for package availability with the
Tape and Reel option.
= 3,000/Reel
2018 Microchip Technology Inc.
DS20006116A-page 13
MIC2779
NOTES:
DS20006116A-page 14
2018 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
arising from this information and its use. Use of Microchip
devices in life support and/or safety applications is entirely at
the buyer’s risk, and the buyer agrees to defend, indemnify and
hold harmless Microchip from any and all damages, claims,
suits, or expenses resulting from such use. No licenses are
conveyed, implicitly or otherwise, under any Microchip
intellectual property rights unless otherwise stated.
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and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping
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SQTP is a service mark of Microchip Technology Incorporated in
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CERTIFIED BY DNV
The Microchip name and logo, the Microchip logo, AnyRate, AVR,
AVR logo, AVR Freaks, BitCloud, chipKIT, chipKIT logo,
CryptoMemory, CryptoRF, dsPIC, FlashFlex, flexPWR, Heldo,
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Adjacent Key Suppression, AKS, Analog-for-the-Digital Age, Any
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All other trademarks mentioned herein are property of their
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© 2018, Microchip Technology Incorporated, All Rights Reserved.
ISBN: 978-1-5224-3882-3
== ISO/TS 16949 ==
2018 Microchip Technology Inc.
DS20006116A-page 15
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DS20006116A-page 16
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2018 Microchip Technology Inc.
08/15/18