MP6411
Windowed Watchdog Timer
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP6411 is a windowed watchdog timer. It
is used to reset and monitor the microcontroller.
In normal operation, the MCU sends a trigger
signal to the MP6411 in a defined time window
cyclically. A missing or fault trigger signal
causes the watchdog to reset the MCU.
The MP6411 provides a reset signal (low-level
voltage) to the MCU during power-up or under
voltage. Its power supply (VCC) has 5V and
3.3V options.
By setting MODE to high or low, the watchdog
operates in long window mode or short window
mode; the window is programmable.
The MP6411 is available in SOIC8 package.
Windowed Watchdog
Power-On Reset during Power-Up and
Under Voltage
Programmable Short Window Mode or
Long Window Mode
Watchdog Disable Function
Low Shutdown Mode Current
SOIC8 Package
APPLICATIONS
Automotive Systems
Industrial Systems
All MPS parts are lead-free, halogen-free, and adhere to the RoHS
directive. For MPS green status, please visit the MPS website under
Quality Assurance.
“MPS” and “The Future of Analog IC Technology” are registered
trademarks of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
MP6411 Rev. 1.1
1/24/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
1
MP6411―WINDOWED WATCHDOG TIMER
ORDERING INFORMATION
Part Number*
MP6411GS
MP6411GS-33
Package
SOIC-8
SOIC-8
Top Marking
See Below
* For Tape & Reel, add suffix –Z (e.g. MP6411GS–Z);
TOP MARKING (MP6411GS)
MP6411: Product code of MP6411GS
LLLLLLLL: Lot number
MPS: MPS prefix
Y: Year code
WW: Week code
TOP MARKING (MP6411GS-33)
M6411-33: Product code of MP6411GS-33
LLLLLLLL: Lot number
MPS: MPS prefix
Y: Year code
WW: Week code
MP6411 Rev. 1.1
1/24/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
2
MP6411―WINDOWED WATCHDOG TIMER
PACKAGE REFERENCE
TOPVIEW
WDO
WDI
MODE
GND
/WD_DIS
TIMER
VCC
NC
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance
All pins ……………………...............-0.3V to +6V
(2)
Continuous power dissipation (TA = +25°C)
SOIC8
………… ........ …………1.3W
Junction temperature………… ... …………150°C
Lead temperature ………… ...... …………260°C
Storage temperature………….. -65°C to +150°C
SOIC-8…..………………………96……45…C/W
Recommended Operating Conditions
Supply voltage (VCC)
MP6411 …………………………………………5V
MP6411-33 ……………………………………3.3V
Operating junction temp. (TJ) ..... -40°C to 125°C
MP6411 Rev. 1.1
1/24/2018
(3)
θJA
θJC
Notes:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature
TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD (MAX) = (TJ
(MAX)-TA)/θJA. Exceeding the maximum allowable power
dissipation will cause an excessive die temperature, causing
the regulator to go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
3) Measured on JESD51-7, 4-layer PCB.
www.MonolithicPower.com
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© 2018 MPS. All Rights Reserved.
3
MP6411―WINDOWED WATCHDOG TIMER
ELECTRICAL CHARACTERISTICS
VCC = 5V for MP6411, VCC = 3.3V for MP6411-33, TJ = +25C, unless otherwise noted.
Parameter
Power Supply
Timer voltage
Symbol
Quiescent current
IQ
VPOR-HIGH
Power on reset
threshold
VPOR-LOW
Timing
Single period
Power on delay(4)
Sync signal monitoring
time(5)
Watchdog window close
time (short mode)(4)
Watchdog window open
time (short mode) (4)
Watchdog window close
time (long mode) (4)
Watchdog window open
time (long mode) (4)
WDO reset pulse
width(4)
WDI_OK pulse width
Input and Output
WDI logic high
WDI logic low
MODE logic high
MODE logic low
MP6411 Rev. 1.1
1/24/2018
Condition
RTIMER = 51k
MP6411, RTIMER = 100k
MP6411-33, RTIMER = 100k
MP6411, RTIMER = 51k
MP6411-33, RTIMER = 51k
MP6411,
WDO goes high with rising VCC
MP6411-33,
WDO goes high with rising VCC
MP6411,
WDO goes low with falling VCC
MP6411-33,
WDO goes low with falling VCC
Min
Typ
Max
0.3
16
10
25
14
19
14
32
18
4.4
4.6
4.8
2.9
3
3.1
Units
V
µA
V
4.3
4.5
4.7
2.8
2.9
3
-10%
880
10
+10%
T
t0
RTIMER = 51k
RTIMER = 51k
t1
RTIMER = 51k
450
cycle
t2
RTIMER = 51k, mode = low
15
cycle
t3
RTIMER = 51k, mode = low
10
cycle
t4
RTIMER = 51k, mode = high
1500
cycle
t5
RTIMER = 51k, mode = high
1000
cycle
4
cycle
t6
RTIMER = 51k
10
MP6411
MP6411-33
MP6411
MP6411-33
MP6411
MP6411-33
MP6411
MP6411-33
5000
3.2
2.1
μs
V
0.8
0.6
3.2
2.1
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© 2018 MPS. All Rights Reserved.
µs
cycle
V
V
0.8
0.6
V
4
MP6411―WINDOWED WATCHDOG TIMER
ELECTRICAL CHARACTERISTICS (continued)
VCC = 5V for MP6411, VCC = 3.3V for MP6411-33, TJ = +25C, unless otherwise noted.
Symbol
Parameter
MODE input Current
/WD_DIS logic high
/WD_DIS logic low
/WD_DIS input Current
WDO high
WDO low
Condition
MP6411, MODE = 5V
MP6411-33, MODE = 3.3V
MP6411, MODE = 0V
MP6411-33, MODE = 0V
MP6411
MP6411-33
MP6411
MP6411-33
MP6411, WD_DIS = 5V
MP6411-33, WD_DIS = 3.3V
MP6411, WD_DIS = 0V
MP6411-33, WD_DIS = 0V
MP6411,
VCC = 5V, IWDO = 1mA
MP6411-33,
VCC=3.3V,RPull-Up=100K
MP6411,
VCC = 5V, IWDO = 1mA
MP6411,
VCC = 1V, IWDO = 300µA
MP6411-33,
Sink 1mA Current
Min
Typ
Max
0.1
1
5
3.3
8
6
3.2
2.1
Units
μA
V
0.8
0.6
V
0.1
1
μA
5
3.3
8
6
μA
VCC-0.2
V
3.29
0.2
0.1
V
0.1
Notes:
4) Derived from bench characterization. Not tested in production.
MP6411 Rev. 1.1
1/24/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
5
MP6411―WINDOWED WATCHDOG TIMER
TYPICAL CHARATERISTICS
VCC=5V for MP6411, VCC=3.3V for MP6411-33, unless otherwise noted.
Quiescent Current vs.
Junction Temperature
28.5
MP6411, RTIMER=51k
17.0
28.0
MP6411-33, RTIMER=51k
18.0
MP6411, RTIMER=100k
16.8
27.5
16.0
16.6
27.0
26.5
16.4
14.0
26.0
16.2
25.5
25.0
-50 -25
11.0
Quiescent Current vs.
Junction Temerature
Quiescent Current vs.
Junction Temperature
0
25
50
75 100 125
16.0
-50 -25
0
25
50
75 100 125
Quiescent Current vs.
Junction Temerature
Single Period vs.
Junction Temperature
MP6411-33, RTIMER=100k
RTIMER=51k
910
12.0
-50 -25
0
25
50
75 100 125
Single Period vs. RTIMER
TA=25 C
8000
7000
900
6000
10.0
890
5000
880
4000
3000
870
9.0
2000
860
8.0
-50 -25
MP6411 Rev. 1.1
1/24/2018
0
25
50
75 100 125
850
-50 -25
1000
0
25
50
75 100 125
0
0
100
200
www.MonolithicPower.com
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© 2018 MPS. All Rights Reserved.
300
400
500
6
MP6411―WINDOWED WATCHDOG TIMER
PIN FUNCTION
Pin #
Name
1
WDO
2
WDI
3
MODE
4
GND
5
NC
6
VCC
7
TIMER
8
/WD_DIS
MP6411 Rev. 1.1
1/24/2018
Description
Watchdog output. WDO outputs a reset signal to the MCU.
MP6411 WDO is the output of a inverter, it is not must to connect WDO to VCC or
another voltage source through a resistor.
MP6411-33 WDO is the open drain of a MOSFET and should be connected to VCC
or another voltage source through a resistor (e.g.100kΩ).
Watchdog input. WDI receives the trigger signal from the MCU.
Mode switching pin. Pull MODE high to make the watchdog operate in long window
mode; pull MODE low to make it work in short window mode. MODE has a weak
internal pull-up.
Ground.
Not connected.
Power input.
Watchdog timer pin. TIMER sets the time-out with an external resistor
Watchdog disable pin. Pull /WD_DIS low to disable the watchdog; pull /WD_DIS
high to enable the watchdog. It has a weak internal pull-up.
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
7
MP6411―WINDOWED WATCHDOG TIMER
FUNCTIONAL BLOCK DIAGRAM
Figure 1: Functional Block Diagram
MP6411 Rev. 1.1
1/24/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
8
MP6411―WINDOWED WATCHDOG TIMER
TIMING DIAGRAM
Power-on reset and no sync signal
Synchronized by WDI and triggered in open window (MODE=0, short window mode)
VCC
t0
WDO
t2
t3
t1
WDI
MODE
1
WDI_OK
t2
WDI_OK
0
0
Synchronized by WDI and no trigger signal (MODE=0, short window mode)
MP6411 Rev. 1.1
1/24/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
9
MP6411―WINDOWED WATCHDOG TIMER
Synchronized by WDI and triggered in closed window (MODE=0, short window mode)
VCC
t6
t0
WDO
t1
WDI_OK
WDI
MODE
1
t2
t1
WDI_OK
0
0
Note: When the WDI_OK rising edge that comes at WDO is low, the t6 timer will be reset. Therefore, in
the situation above, the WDO reset signal maintains a t6+WDI_OK time.
Synchronized by WDI and triggered in open window (MODE=1, long window mode)
Synchronized by WDI and no trigger signal (MODE=1, long window mode)
MP6411 Rev. 1.1
1/24/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
10
MP6411―WINDOWED WATCHDOG TIMER
Synchronized by WDI and triggered in closed window (MODE=1, long window mode)
Note: When the WDI_OK rising edge that comes at WDO is low, the t6 timer will be reset. Therefore, in
the situation above, the WDO reset signal maintains a t6+WDI_OK time.
MP6411 Rev. 1.1
1/24/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
11
MP6411―WINDOWED WATCHDOG TIMER
STATE DIAGRAM
WDO reset state
time-out t0
Sync signal
monitoring state
WDI_OK &
MODE=1
WDI_OK &
MODE=0
Short window
close state
MODE=1
MODE=0
MODE=0
Long window
close state
MODE=1
WDI_OK
time-out t2
time-out t6
WDI=0
time-out t1
WDI_OK
time-out t4
Short window
open state
Long window
open state
WDI=0
time-out t5
time-out t3
WDO reset pulse
state
Note: The state diagram above does not include if a WDI error occurs.
MP6411 Rev. 1.1
1/24/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
12
MP6411―WINDOWED WATCHDOG TIMER
OPERATION
Supply Voltage
VCC= 5V10% is recommended for MP6411
normal operation; while VCC= 3.3V10% is
recommended for MP6411-33 normal operation.
WDO is pulled low when VCC rises to 1V or
above. After VCC rises to 90% (typically), WDO
will remain at a low level for t0 to reset the MCU.
TIMER
Period T (s):
T s 15.75 R TIMER k 73.5
RTIMER (k):
R TIMER k 0.063 T s 4.67
If no WDI_OK signal is received in t2+t3, the
watchdog outputs a reset signal and goes
into a sync signal monitoring state.
If MODE is pulled high during short window
mode, the watchdog will go into long
window mode.
Long Window Mode
If the MCU and watchdog are synchronized
correctly and MODE is high, the watchdog will
operate in long window mode, and the following
will occur:
If WDI_OK is received in a window close
state (t4), the watchdog outputs a reset
signal and goes into a sync signal
monitoring state.
If WDI_OK is received in a window open
state (t5), the watchdog goes into a window
close state. The MCU works in normal
operation in this situation.
If no WDI_OK signal is received in t4+t5, the
watchdog outputs a reset signal and goes
into a sync signal monitoring state.
If MODE is pulled low during a long window
mode, the watchdog will go into a short
window mode.
For example: RTIMER=51kΩ, T0.88ms
Monitor MCU Synchronization Signal
When the watchdog is in a “sync signal
monitoring state,” the following will occur:
If the watchdog IC receives a WDI_OK
signal from the MCU within t1 (WDI remains
low for 10µs to 5ms), the timer will be reset,
and the watchdog works in normal
operation.
If the watchdog does not receive the
WDI_OK signal from the MCU during t1, it
will generate a reset signal and go into
“sync signal monitor state” again.
Watchdog Disable
Short Window Mode
If the MCU and watchdog are synchronized
correctly and MODE is low, the watchdog will
work in short window mode:
Pull /WD_DIS low to disable the watchdog; pull
it high to enable the watchdog. /WD_DIS has a
weak internal pull-up, so the watchdog is
enabled if /WD_DIS is left open.
WDI Error
If WDI_OK is received in a window close
state (t2), the watchdog outputs a reset
signal and goes into a sync signal
monitoring state.
If WDI_OK is received in a window open
state (t3), the watchdog goes into a window
close state. The MCU works in normal
operation in this situation.
MP6411 Rev. 1.1
1/24/2018
If a WDI signal remains at a low level for longer
than the maximum WDI_OK pulse width, it is
regarded as an error. When this error occurs,
WDO is pulled down until WDI returns to a high
level.
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MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
13
MP6411―WINDOWED WATCHDOG TIMER
PACKAGE INFORMATION
SOIC-8
0.189(4.80)
0.197(5.00)
8
0.050(1.27)
0.024(0.61)
5
0.063(1.60)
0.150(3.80)
0.157(4.00)
PIN 1 ID
1
0.228(5.80)
0.244(6.20)
0.213(5.40)
4
TOP VIEW
RECOMMENDED LAND PATTERN
0.053(1.35)
0.069(1.75)
SEATING PLANE
0.004(0.10)
0.010(0.25)
0.013(0.33)
0.020(0.51)
0.0075(0.19)
0.0098(0.25)
SEE DETAIL "A"
0.050(1.27)
BSC
SIDE VIEW
FRONT VIEW
0.010(0.25)
x 45o
0.020(0.50)
GAUGE PLANE
0.010(0.25) BSC
0o-8o
0.016(0.41)
0.050(1.27)
DETAIL "A"
NOTE:
1) CONTROL DIMENSION IS IN INCHES. DIMENSION IN
BRACKET IS IN MILLIMETERS.
2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH,
PROTRUSIONS OR GATE BURRS.
3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH
OR PROTRUSIONS.
4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING)
SHALL BE 0.004" INCHES MAX.
5) DRAWING CONFORMS TO JEDEC MS-012, VARIATION AA.
6) DRAWING IS NOT TO SCALE.
NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third
party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not
assume any legal responsibility for any said applications.
MP6411 Rev. 1.1
1/24/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
14
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