TI TPS3813J25

TPS3813J25, TPS3813L30, TPS3813K33, TPS3813I50
PROCESSOR SUPERVISORY CIRCUITS WITH WINDOW-WATCHDOG
SLVS331A – DECEMBER 2000 – REVISED APRIL 2001
features
typical applications
D
D
D
D
D
D
D
D
Window-Watchdog With Programmable
Delay and Window Ratio
6-Pin SOT-23 Package
Supply Current of 9 µA (Typ)
Power On Reset Generator With a Fixed
Delay Time of 25 ms
Precision Supply Voltage Monitor 2.5 V, 3 V,
3.3 V, 5 V
Open-Drain Reset Output
Temperature Range . . . –40°C to 85°C
D
D
D
Applications Using DSPs, Microcontrollers,
or Microprocessors
Safety Critical Systems
Automotive Systems
Heating Systems
TPS3813
DBV PACKAGE
(TOP VIEW)
description
The TPS3813 family of supervisory circuits provides circuit initialization and timing supervision,
primarily for DSPs and processor-based systems.
WDI
1
6
RESET
GND
2
5
WDR
WDT
3
4
VDD
ACTUAL SIZE
3,00 mm x 3,00 mm
During power on, RESET is asserted when supply
voltage (VDD) becomes higher than 1.1 V. There
after, the supervisory circuit monitors VDD and keeps RESET active as long as VDD remains below the threshold
voltage (VIT). An internal timer delays the return of the output to the inactive state (high) to ensure proper system
reset. The delay time, td = 25 ms typical, starts after VDD has risen above the threshold voltage (VIT). When the
supply voltage drops below the threshold voltage (VIT), the output becomes active (low) again. No external
components are required. All the devices of this family have a fixed-sense threshold voltage (VIT) set by an
internal voltage divider.
For safety critical applications the TPS3813 family incorporates a so-called window-watchdog with
programmable delay and window ratio. The upper limit of the watchdog time-out can be set by either connecting
WDT to GND, VDD, or using an external capacitor. The lower limit and thus the window ratio is set by connecting
WDR to GND or VDD. The supervised processor now needs to trigger the TPS3813 within this window not to
assert a RESET.
typical operating circuit
VDD
0.1 µF
0.1 µF
R
VDD
WDR RESET
VDD
RESET
TPS3813
WDT
CWP
WDI
GND
uC
I/O
GND
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright  2001, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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TPS3813J25, TPS3813L30, TPS3813K33, TPS3813I50
PROCESSOR SUPERVISORY CIRCUITS WITH WINDOW-WATCHDOG
SLVS331A – DECEMBER 2000 – REVISED APRIL 2001
description continued
The product spectrum is designed for supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The circuits are available
in a 6-pin SOT–23 package.
The TPS3813 devices are characterized for operation over a temperature range of –40°C to 85°C.
PACKAGE INFORMATION
DEVICE NAME
THRESHOLD VOLTAGE
MARKING
TPS3813J25DBV
2.25 V
PCDI
PEZI
TA
–40
40_C to 85_C
TPS3813L30DBV
2.64 V
TPS3813K33DBV
2.93 V
PFAI
TPS3813I50DBV
4.55 V
PFBI
ordering information
TPS381
3
J
25
DBV
R
Reel
Package
Nominal Supply Voltage
Nominal Threshold Voltage
Functionality
Family
TPS3813
FUNCTION/TRUTH TABLE
VDD > VIT
0
RESET
1
H
L
functional schematic
RESET
Oscillator
WDT
Reset Logic
and Timer
Detection
Circuit
VDD
GND
Power to circuitry
Watchdog
Ratio
Detection
R1
+
_
WDR
R2
GND
GND
Bandgap
Voltage
Reference
Rising Edge
Detection
GND
2
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WDI
TPS3813J25, TPS3813L30, TPS3813K33, TPS3813I50
PROCESSOR SUPERVISORY CIRCUITS WITH WINDOW-WATCHDOG
SLVS331A – DECEMBER 2000 – REVISED APRIL 2001
timing diagram
VDD
VIT
0.6 V
t
td
td
td
RESET
Output Condition
Undefined
Output Condition
Undefined
t
WDI
t
1st Window
Without Lower
Boundary
2nd Window
With Lower
Boundary
3rd Window
With Lower
Boundary
Trigger Pulse
1st Window
Lower Window
Without Lower 2nd Window
1st Window
Boundary
Boundary
With Lower
Without Lower
Boundary
Boundary
3rd Window
With Lower
Boundary
The lower boundary of the watchdog window starts with the rising edge of the WDI trigger pulse. At the same
time, all internal timers will be reset. If an external capacitor is used, the lower boundary is impacted due to the
different oscillator frequency. This is described in more detail in the following section. The timing diagram and
especially the shaded boundary is prepared in a nonreal ratio scale to better visualize the description.
Terminal Functions
TERMINAL
NAME
NO.
I/O
DESCRIPTION
GND
2
I
Ground
RESET
6
O
Open-drain reset output
VDD
WDI
4
I
Supply voltage and supervising input
1
I
Watchdog timer input
WDR
5
I
Selectable watchdog window ratio input
WDT
3
I
Programmable watchdog delay input
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TPS3813J25, TPS3813L30, TPS3813K33, TPS3813I50
PROCESSOR SUPERVISORY CIRCUITS WITH WINDOW-WATCHDOG
SLVS331A – DECEMBER 2000 – REVISED APRIL 2001
detailed description
implemented window-watchdog settings
There are two different ways to set up the watchdog window. The first way is to use the implemented timing which
is a default setting. Or, the default settings can be activated by wiring the WDT and WDR pin to VDD or GND.
There is a total of four different timings available with these settings. They are listed in the table below.
WINDOW
FRAME
SELECTED OPERATION MODE
WDR = 0 V
WDT = 0 V
WDR = VDD
WDR = 0 V
WDT = VDD
WDR = VDD
LOWER WINDOW
FRAME
Max = 0.3 s
Max = 9.46 ms
Typ = 0.25 s
Typ = 7.86 ms
Min = 0.2 s
Min = 6.27 ms
Max = 0.3 s
Max = 2.43 ms
Typ = 0.25 s
Typ = 2 ms
Min = 0.2 s
Min = 1.58 ms
Max = 3 s
Max = 93.8 ms
Typ = 2.5 s
Typ = 78.2 ms
Min = 2 s
Min = 62.5 ms
Max = 3 s
Max = 23.5 ms
Typ = 2.5 s
Typ = 19.6 ms
Min = 2 s
Min = 15.6 ms
To visualize the values named in the table, a timing diagram was prepared. It is used to describe the upper and
lower boundary settings. For an application, the important boundaries are the tboundary,max and twindow,min.
Within these values, the watchdog timer should be retriggered to avoid a timeout condition or a boundary
violation in the event of a trigger pulse in the lower boundary. The values in the table above are typical and worst
case conditions. They are valid over the whole temperature range of –40°C to 85°C.
In the shaded area of Figure 1, it cannot be predicted if the device will detect a violation or not and release a
reset. This is also the case between the boundary tolerance of tboundary,min and tboundary,max as well as between
twindow,min and twindow,max. It is important to set up the trigger pulses accordingly to avoid violations in these
areas.
WDI
Detection of
Rising Edge
tboundary, min
tboundary, max
ÎÎ
ÎÎ
ÎÎ
ÎÎ
Window Frame to Reset the WDI
tboundary, typ
twindow, typ
twindow, min
twindow, max
Figure 1. Upper and Lower Boundary Visualization
4
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ÎÎ
ÎÎ
ÎÎ
ÎÎ
t
TPS3813J25, TPS3813L30, TPS3813K33, TPS3813I50
PROCESSOR SUPERVISORY CIRCUITS WITH WINDOW-WATCHDOG
SLVS331A – DECEMBER 2000 – REVISED APRIL 2001
detailed description (continued)
timing rules of window-watchdog
After the reset of the supervisor is released, the lower boundary of the first WDI window is disabled. However,
after the first WDI pulse low-to-high transition is detected, the lower boundary function of the window is enabled.
All further WDI pulses will need to fit into the configured window frame.
programmable window-watchdog by using an external capacitor
The upper boundary of the watchdog timer can be set by an external capacitor connected between the WDT
pin and GND. Common consumer electronic capacitors can be used to implement this feature. They should
have low ESR and low tolerances since the tolerances have to be considered if the calculations are performed.
The first formula is used to calculate the upper window frame. After calculating the upper window frame, the
lower boundary can be calculated. As in the last example, the most important values are the tboundary,max and
twindow,min. The trigger pulse has to fit into this window frame.
The external capacitor should have a value between a minimum of 47 pF and a maximum of 63 nF.
SELECTED OPERATION MODE
WDT = external capacitor C((ext)
t)
t
+
window,typ
ǒ Ǔ
WINDOW FRAME
twindow,max = 1.25 × twindow,typ
twindow,min = 0.75 × twindow,typ
WDR = 0 V and WDR = VDD
C
(ext)
15.55 pF
)1
6.25 ms
lower boundary calculation
The lower boundary can be calculated based on the values given in the switching characteristics. Additionally,
facts have to be taken into account to verify that the lower boundary is where it is expected. Since the internal
oscillator of the window watchdog is running free, any rising edge at the WDI pin will be taken into account at
the next internal clock cycle. This happens regardless of the external source. Since the shift between internal
and external clock is not known, it is best to consider the worst case condition for calculating this value.
SELECTED OPERATION MODE
WDR = 0 V
LOWER BOUNDRY OF FRAME
tboundary,max = twindow,max / 23.5
tboundary,typ = twindow,typ / 25.8
tboundary,min = twindow,min / 28.7
tboundary,max = twindow,max / 51.6
WDT = external capacitor C((ext)
t)
WDR = VDD
tboundary,typ = twindow,typ / 64.5
tboundary,min = twindow,min / 92.7
watchdog software considerations
To benefit from the window watchdog feature and help the watchdog timer monitor the software execution more
closely, it is recommended that the watchdog be set and reset at different points in the program rather than
pulsing the watchdog input periodically by using the prescaler of a microcontroller or DSP. Furthermore, the
watchdog trigger pulses should be set to different timings inside the window frame to release a defined reset,
if the program should hang in any subroutine. This allows the window watchdog to detect timeouts of the trigger
pulse as well as pulses that distort the lower boundary.
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TPS3813J25, TPS3813L30, TPS3813K33, TPS3813I50
PROCESSOR SUPERVISORY CIRCUITS WITH WINDOW-WATCHDOG
SLVS331A – DECEMBER 2000 – REVISED APRIL 2001
detailed description (continued)
application example
A typical application example (see Figure 2) is used to describe the function of the watchdog in more detail.
To configure the window watchdog function, two pins are provided by the TPS3813. These pins set the window
timeout and ratio.
The window watchdog ratio is a fixed ratio, which determines the lower boundary of the window frame. It can
be configured in two different frame sizes.
If the window watchdog ratio pin (WDR) is set to VDD, Position 1 in Figure 2, then the lower window frame is
a value based on a ratio calculation of the overall window timeout size: For the watchdog timeout pin (WDT)
connected to GND, it is a ratio of 1:124.9, for WDT connected to VDD, it is a ratio of 1:127.7, and for an external
capacitor connected to WDT, it is a ratio of 1:64.5.
If the window watchdog ratio pin (WDR) is set to GND, Position 2, the lower window frame will be a value based
on a ratio calculation of the overall window timeout size: For the watchdog timeout pin (WDT) connected to GND,
it will be a ratio of 1:31.8, for WDT connected to VDD it will be 1:32, and for an external capacitor connected to
WDT it will be 1:25.8.
The watchdog timeout can be set in two fixed timings of 0.25 seconds and 2.5 seconds for the window or can
by programmed by connecting a external capacitor with a low leakage current at WDT.
Example: If the watchdog timeout pin (WDT) is connected to VDD, the timeout will be 2.5 seconds. If the window
watchdog ratio pin (WDR) is set in this configuration to a ratio of 1:127.7 by connecting the pin to VDD, the lower
boundary is 19.6 ms.
VDD
0.1 µF
0.1 µF
VDD
R
Position 1
See Note A
Position 2
See Note B
NOTES: A.
B.
C.
D.
E.
VDD
RESET
WDR
WDT
Position 5
See Note E
Position 3
See Note C
uC
WDI
GND
VDD
Watchdog window ratio
Watchdog window ratio
Watchdog timeout set to typical 2.5 sec
Watchdog timeout programmed by external capacitor
Watchdog timeout set to typical 0.25 sec
Figure 2. Application Example
6
RESET
TPS3813
Position 4
See Note D
C(ext)
VDD
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I/O
GND
TPS3813J25, TPS3813L30, TPS3813K33, TPS3813I50
PROCESSOR SUPERVISORY CIRCUITS WITH WINDOW-WATCHDOG
SLVS331A – DECEMBER 2000 – REVISED APRIL 2001
absolute maximum ratings over operating free-air temperature (unless otherwise noted)†
Supply voltage, VDD (see Note1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
All other pins (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 7 V
Maximum low output current, IOL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 mA
Maximum high output current, IOH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –5 mA
Input clamp current, IIK (VI < 0 or VI > VDD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
Output clamp current, IOK (VO < 0 or VO > VDD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Operating free-air temperature range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to 85°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
Soldering temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
† Stresses beyond 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 beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: All voltage values are with respect to GND. For reliable operation the device should not be operated at 7 V for more than t = 1000h
continuously.
DISSIPATION RATING TABLE
PACKAGE
TA <25°C
POWER RATING
DERATING FACTOR
ABOVE TA = 25°C
TA = 70°C
POWER RATING
TA = 85°C
POWER RATING
DBV
437 mW
3.5 mW/°C
280 mW
227 mW
recommended operating conditions at specified temperature range
MIN
MAX
UNIT
Supply voltage, VDD
2
6
V
Input voltage, VI
0
VDD + 0.3
V
High-level input voltage, VIH
0.7 x VDD
Low-level input voltage, VIL
Input transition rise and fall rate, ∆t/∆V
Pulse width of WDI trigger pulse, tw
50
Operating free-air temperature range, TA
–40
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V
0.3 x VDD
V
100
ns/V
85
°C
ns
7
TPS3813J25, TPS3813L30, TPS3813K33, TPS3813I50
PROCESSOR SUPERVISORY CIRCUITS WITH WINDOW-WATCHDOG
SLVS331A – DECEMBER 2000 – REVISED APRIL 2001
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VOL
VIT
TEST CONDITIONS
Low-level output voltage
VDD = 2 V to 6 V,
VDD = 3.3 V
Power up reset voltage (see Note 2)
VDD = 6 V,
VDD ≥ 1.1 V,
Negative
g
-ggoingg input threshold
voltage (see Note 3)
Hysteresis
High-level input current
IIL
Low level input current
Low-level
IOH
High-level output current
IDD
MAX
IOL = 2 mA
IOL = 4 mA
IOL= 50 µA
0.4
V
V
2.2
2.25
2.3
2.58
2.64
2.7
2.87
2.93
3
4.45
4.55
4.65
TA = –40°C
40°C – 85°C
TPS3813J25
30
TPS3813L30
35
TPS3813K33
40
TPS3813I50
60
WDI = VDD = 6 V,
WDR = VDD = 6 V
WDT = VDD = 6 V, VDD > VIT
RESET = High
WDT
WDI, WDR
WDI = 0 V, WDR = 0 V, VDD = 6 V
WDT
WDT = 0 V, VDD > VIT, RESET = High
mV
–25
25
–100
100
–25
25
–100
100
nA
VDD = VIT + 0.2 V, VOH = VDD
VDD = 2 V output unconnected
Supply current
V
0.2
TPS3813L30
TPS3813K33
UNIT
0.4
TPS3813J25
WDI, WDR
IIH
TYP
0.2
TPS3813I50
Vhys
MIN
IOL = 500 µA
25
VDD = 5 V output unconnected
VI = 0 V to VDD
9
13
20
25
nA
µA
Ci
Input capacitance
5
pF
NOTES: 2. The lowest supply voltage at which RESET becomes active. tr,VDD ≥ 15 µs/V.
3. To ensure best stability of the threshold voltage, a bypass capacitor (ceramic, 0.1 µF) should be placed near to the supply terminals.
timing requirements at RL = 1 MΩ, CL = 50 pF, TA = –40°C to 85°C
PARAMETER
tw
TEST CONDITIONS
Pulse width at VDD
VDD = VIT– + 0.2 V,
MIN
VDD = VIT– – 0.2 V
TYP
MAX
UNIT
µs
3
switching characteristics at RL = 1 MΩ, CL = 50 pF, TA = –40°C to 85°C
PARAMETER
td
tt(out)
TEST CONDITIONS
VDD ≥ VIT + 0.2 V, See timing diagram
WDT = 0 V
Delay time
Watchdog time-out
Upper
U
er limit
WDT = VDD
Propagation (delay) time,
high-to-low-level output
0.2
0.25
0.3
2
2.5
3
1:31.8
1:124.9
1:127.7
VIH = VIT + 0.2 V
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ms
s
ms
1:32
WDR = VDD, WDT = VDD
VIL = VIT – 0.2 V,
UNIT
1:25.8
WDR = VDD, WDT = 0 V
NOTES: 4. 155 pF < C(ext) < 63 nF
5. (C(ext) ÷ 15.55 pF + 1) x 6.25 ms
8
30
WDR = 0 V, WDT = 0 V
WDR = 0 V, WDT = programmable
VDD to RESET delay
MAX
25
See
Note 5
WDR = VDD, WDT = programmable
tPHL
TYP
20
WDT = programmable (see Note 4)
WDR = 0 V, WDT = VDD
Watchdog window ratio
MIN
1:64.5
30
50
µs
TPS3813J25, TPS3813L30, TPS3813K33, TPS3813I50
PROCESSOR SUPERVISORY CIRCUITS WITH WINDOW-WATCHDOG
SLVS331A – DECEMBER 2000 – REVISED APRIL 2001
TYPICAL CHARACTERISTICS
LOW-LEVEL OUTPUT VOLTAGE
vs
LOW-LEVEL OUTPUT CURRENT
SUPPLY CURRENT
vs
SUPPLY VOLTAGE
2
20
I DD – Supply Current – µ A
18
VOL – Low-Level Output Voltage – V
WDI = GND,
WDT = GND,
WDR = GND
16
85°C
14
12
25°C
10
8
–40°C
6
0°C
4
1.50
25°C
1.25
1
0.75
85°C
0°C
0.50
–40°C
0.25
2
0
VDD = 2 V,
WDI = GND,
WDT = GND,
WDR = GND
1.75
0
1
2
3
4
5
0
6
0
1
Figure 3
VIT – Normalized Input Threshold Voltage – V (25 ° C)
800
I – Input Current – nA
25°C
400
85°C
0°C
0
–200
–40°C
–400
I
VDD = 6 V,
WDI = GND,
WDR = GND
–600
–800
–1000
0
1
2
3
4
5
6
7
NORMALIZED INPUT THRESHOLD VOLTAGE
vs
FREE-AIR TEMPERATURE AT VDD
1000
200
3
Figure 4
INPUT CURRENT
vs
INPUT VOLTAGE AT WDT
600
2
IOL – Low-Level Output Current – mA
VDD – Supply Voltage – V
4
5
6
VI – Input Voltage at WDT – V
1.001
1.000
0.999
0.998
0.997
WDI = Triggered,
WDR = GND,
WDT = GND
0.996
0.995
–40
–20
0
20
40
60
80
TA – Free-Air Temperature At VDD – °C
Figure 5
Figure 6
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TPS3813J25, TPS3813L30, TPS3813K33, TPS3813I50
PROCESSOR SUPERVISORY CIRCUITS WITH WINDOW-WATCHDOG
SLVS331A – DECEMBER 2000 – REVISED APRIL 2001
TYPICAL CHARACTERISTICS
MINIMUM PULSE DURATION AT VDD
vs
VDD THRESHOLD OVERDRIVE VOLTAGE
t W – Minimum Pulse Duration at VDD – µ s
20
18
16
14
12
10
8
6
4
2
0
0
0.2
0.4
0.6
0.8
1
1.2
VDD – Threshold Overdrive Voltage – V
Figure 7
10
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1.4
TPS3813J25, TPS3813L30, TPS3813K33, TPS3813I50
PROCESSOR SUPERVISORY CIRCUITS WITH WINDOW-WATCHDOG
SLVS331A – DECEMBER 2000 – REVISED APRIL 2001
MECHANICAL DATA
DBV (R-PDSO-G6)
PLASTIC SMALL-OUTLINE
0,95
6X
6
0,50
0,25
0,20 M
4
1,70
1,50
1
0,15 NOM
3,00
2,60
3
Gage Plane
3,00
2,80
0,25
0°–8°
0,55
0,35
Seating Plane
1,45
0,95
0,05 MIN
0,10
4073253-5/F 10/00
NOTES: A.
B.
C.
D.
All linear dimensions are in millimeters.
This drawing is subject to change without notice.
Body dimensions do not include mold flash or protrusion.
Leads 1, 2, 3 are wider than leads 4, 5, 6 for package orientation.
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11
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