ams AS1918 Microprocessor supervisory circuits with manual reset and watchdog Datasheet

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D a t asheet
AS1916 - AS1918
M i c r o p r o c e s s o r S u p e r v i s o r y C i r c u i t s w i t h M a n u a l R e s e t a n d Wa t c h d o g
1 General Description
2 Key Features
The AS1916 - AS1918 microprocessor supervisory circuits were
designed to generate a reset when the monitored supply voltage falls
below a factory-trimmed threshold. The reset remains asserted for a
minimum timeout period after the supply voltage stabilizes.
VCC Supervisory Range: +1.8 to +3.6V
Guaranteed to be in the correct state for VCC higher than +1.0V,
these devices are ideal for portable and battery-powered systems
with strict monitoring requirements.
Manual Reset Input
Reset Timeout Delay: 215ms
Three Reset Output Types
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- Active-Low Push/Pull (AS1916)
- Active-High Push/Pull (AS1917)
- Active-Low Open-Drain (AS1918)
The devices feature factory-trimmed thresholds to monitor a supply
voltage between 1.8 and 3.6V.
Model
AS1916
AS1917
AS1918
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The devices are available with the reset output types listed in Table
1.
Table 1. Standard Products
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Guaranteed Reset Valid Down to VCC = +1.0V
Watchdog Timeout Period: 1.5s
Immune to Fast Negative VCC Transients
Reset Output Type
External Components Not Required
Active-Low Push/Pull
Operating Temperature Range: -40 to +125°C
Active-High Push/Pull
5-pin SOT23 Package
Active-Low Open-Drain
The AS1916 - AS1918 include a manual-reset input for systems that
never fully power down the microprocessor.
3 Applications
Additionally, these devices feature a watchdog timer to help ensure
that the processor is operating within proper code boundaries.
The devices are ideal for portable and battery-powered systems,
embedded controllers, intelligent instruments, automotive systems,
and critical CPU monitoring applications.
The AS1916 - AS1918 are available in a 5-pin SOT23 package.
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Figure 1. Typical Application Diagram
VCC
5
RESETN
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VCC
External
Reset
I/O Supply
1
RESETN
AS1916/
AS1918
CPU
3
4
MRN
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WDI
I/O
GND
GND 2
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AS1916 - AS1918
Datasheet - P i n A s s i g n m e n t s
4 Pin Assignments
GND
2
MRN
3
5 VCC
AS1916 - AS1918
4 WDI
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1
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RESETN/RESET
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Figure 2. Pin Assignments (Top View)
4.1 Pin Descriptions
Table 2. Pin Descriptions
Pin Number
Pin Name
RESETN
RESET
2
GND
Ground
Active-Low Manual Reset Input. Pulling this pin low asserts a reset. This pin is connected to the internal 50kΩ
pullup to VCC. This reset remains active as long as MRN is low and for the reset timeout period (see tRP on
page 4) after MRN goes high.
Note: If the manual reset feature is not used, this pin should be unconnected or connected to VCC.
WDI
Watchdog Input. If WDI remains high or low for longer than the watchdog timeout period (see tWD on page 5),
the internal watchdog timer period expires and a reset is triggered for the reset timeout period (see tRP on page
4). The internal watchdog timer clears whenever a reset is a asserted or when WDI senses a rising or falling
edge.
Note: To disable the watchdog feature, this pin must be unconnected or connected to a tri-state buffer output.
WDI must be low or unconnected (tristate) during the reset timeout period tRP, (see Figure 11 on page 8).
VCC
Supervised Voltage Input. This pin serves as the supervised supply voltage input.
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MRN
Active-High Reset Output (AS1917). The RESET signal toggles from low to high when VCC, or MRN is pulled
low, or the watchdog triggers a reset. This output signal remains high for the reset timeout period (see tRP on
page 4) after all supervised voltages exceed their reset threshold, or MRN goes low to high, or the watchdog
triggers a reset.
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Active-Low Reset Output (AS1916, AS1918). The RESETN signal toggles from high to low when VCC, or
MRN is pulled low, or the watchdog triggers a reset. This output signal remains low for the reset timeout period
after all supervised voltages exceed their reset threshold, or MRN goes low to high, or the watchdog triggers a
reset.
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1
Description
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Revision 1.04
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AS1916 - AS1918
Datasheet - A b s o l u t e M a x i m u m R a t i n g s
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 3 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 in Electrical Characteristics on page 4 is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device rel11iability.
Table 3. Absolute Maximum Ratings
Max
Units
Electrical Parameters
-0.3
+5.0
V
-0.3
+7.0
V
Push/Pull RESET, RESETN
-0.3
VCC +
0.3
V
MRN, WDI to GND
-0.3
VCC +
0.3
V
Input Current (VCC)
20
mA
Output Current (RESET, RESETN)
20
mA
696
mW
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VCC to GND
Open-Drain RESETN
Comments
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Min
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Parameter
Continuous Power Dissipation
Continuous Power Dissipation
(TAMB = +70ºC)
Derate 8.7mW/ºC above +70ºC
Temperature Ranges and Storage Conditions
Junction Temperature
Storage Temperature Range
-55
Package Body Temperature
Humidity non-condensing
5
ºC
ºC
+260
ºC
85
%
1
The reflow peak soldering temperature (body temperature)
specified is in accordance with IPC/JEDEC J-STD-020
“Moisture/Reflow Sensitivity Classification for NonHermetic Solid State Surface Mount Devices”.
The lead finish for Pb-free leaded packages is matte tin
(100% Sn).
Represents a max. floor life time of unlimited
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Moisture Sensitive Level
+150
+150
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Revision 1.04
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AS1916 - AS1918
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
VCC = +2.7 to +3.6V for AS19xx-T/S/R, VCC = +2.1 to +2.75V for AS19xx- Z/Y, VCC = +1.53 to +2.0V for AS19xx-W/V; Typical values @ TAMB
= +25ºC (unless otherwise specified).
Table 4. Electrical Characteristics
TAMB
Operating Temperature Range
VCC
Operating Voltage Range
ICC
VCC Supply Current
(MRN and WDI Not Connected)
Conditions
1.0
TAMB = -40 to +125ºC
1.2
VCC = +3.6V, No Load,
TAMB = -40ºC to +85ºC
TAMB = -40 to +125ºC
TAMB = -40 to +85ºC
TAMB = -40 to +125ºC
VCC Reset Threshold
(VCC Falling)
VTH
TAMB = -40 to +85ºC
TAMB = -40 to +125ºC
TAMB = -40 to +85ºC
TAMB = -40 to +125ºC
TAMB = -40 to +85ºC
TAMB = -40 to +125ºC
TAMB = -40 to +85ºC
TAMB = -40 to +125ºC
+125
ºC
3.6
12
µA
19
AS19xx-T
2.994
3.08
2.972
2.848
3.154
3.179
AS19xx-S
2.93
AS19xx-R
AS19xx-Z
AS19xx-Y
AS19xx-W
AS19xx-V
2.827
3.000
2.556
3.024
2.63
2.538
2.255
2.714
2.32
2.239
2.129
2.19
V
2.243
2.260
1.67
1.612
1.536
2.376
2.394
2.113
1.623
2.693
1.710
1.723
1.58
1.525
1.618
1.631
60
ppm/
ºC
Reset Threshold Hysteresis
8 x VTH
mV
55
µs
tRP
Reset Timeout Period
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VCC to Reset
Output Delay
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RESETN Output Low
(Push/Pull or Open-Drain)
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Reset Threshold
Temperature Coefficient
tRD
ILKG
Units
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TAMB = -40 to +85ºC
Max
3.6
5.5
VCC = +3.6V, No Load,
TAMB = -40 to +125ºC
TAMB = -40 to +85ºC
VOH
Typ
-40
TAMB = 0 to +85ºC
TAMB = -40 to +125ºC
VOL
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1
Symbol
RESETN Output High
(Push/Pull Only)
Open-Drain RESETN Output Leakage
Current
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VCC = VTH to (VTH - 100mV)
TAMB = -40 to +85ºC
140
TAMB = -40 to +125ºC
100
215
280
320
VCC ≥ 1.0V, ISINK = 50µA,
Reset Asserted, TAMB = 0 to +85ºC
0.3
VCC ≥ 1.2V, ISINK = 100µA, Reset Asserted
0.3
VCC ≥ 2.55V, ISINK = 1.2mA,
Reset Asserted
0.3
VCC ≥ 3.3V, ISINK = 3.2mA,
Reset Asserted
0.4
VCC ≥ 1.8V, ISOURCE = 200µA,
Reset Not Asserted
0.8 x
VCC
VCC ≥ 3.15V, ISOURCE = 500µA,
Reset Not Asserted
0.8 x
VCC
VCC ≥ 3.3V, ISOURCE = 800µA,
Reset Not Asserted
0.8 x
VCC
V
V
RESETN Not Asserted
1.0
TAMB = +25ºC
0.2
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Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
Table 4. Electrical Characteristics
Parameter
1
RESET Output High
(Push/Pull Only)
VOH
Conditions
Min
VCC ≥ 1.0V, ISOURCE = 1µA,
Reset Asserted, TAMB = 0 to +85ºC
0.8 x
VCC
VCC ≥ 1.50V, ISOURCE = 100µA,
Reset Asserted
0.8 x
VCC
VCC ≥ 2.55V, ISOURCE = 500µA,
Reset Asserted
0.8 x
VCC
VCC ≥ 3.3V, ISOURCE = 800µA,
Reset Asserted
0.8 x
VCC
Typ
0.3
VCC ≥ 3.15V, ISINK = 1.2mA,
Reset Asserted
0.3
VCC ≥ 3.3V, ISINK = 3.2mA,
Reset Asserted
0.4
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Manual Reset Input
VIL
0.3 x
VCC
MRN Input voltage
VIH
0.7 x
VCC
MRN Minimum Input Pulse
1
MRN Transient Rejection
90
MRN to Reset Delay
130
MRN Pullup Resistance
Watchdog Input
tWD
Watchdog Timeout Period
tWDI
WDI Pulse Width
VIL
25
50
75
TAMB = -40 to +85ºC
1.12
1.5
2.4
TAMB = -40 to +125ºC
0.80
2
IWDI
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WDI Input Current
2.60
20
0.3 x
VCC
WDI Input Voltage
VIH
0.7 x
VCC
WDI = VCC, Time Average
WDI = 0, Time Average
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RESET Output Low
(Push/Pull Only)
Units
V
VCC ≥ 1.8V, ISINK = 500µA,
Reset Asserted
VOL
Max
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Symbol
80
-20
-11
160
V
µs
ns
ns
kΩ
s
ns
V
µA
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1. Over-temperature limits are guaranteed by design and not production tested. Devices tested at +25ºC.
2. Guaranteed by design and not production tested.
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Note: All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality
Control) methods.
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Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
7 Typical Operating Characteristics
TAMB = +25ºC (unless otherwise specified).
Figure 4. VOUT vs. VCC, VTH = 1.58V
1.02
1
0.98
0.94
-40 -20
0
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0.96
5.50
5.00
4.50
4.00
3.50
3.00
2.50
2.00
1.50
1.00
0.50
0.00
-0.50
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1.04
Output Voltage (V)e
Reset Threshold (V) e
1.06
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Figure 3. Normalized Reset Threshold Delay vs.
Temperature Active-Low (Typ)
20
40
60
80
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
100 120
VCC (V)
Temperature (°C)
Figure 5. Reset Timeout Period vs. Temperature
10
240
VCC Supply Current (µA) e
Reset Timeout Periode (ms)
250
Figure 6. Supply Current vs. Temperature
230
220
210
200
190
180
170
160
9
8
7
6
VCC = 1.58V V Version
5
VCC = 3.08V T Version
4
3
150
0
20
40
60
-50
80 100 120
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-40 -20
-25
0
Temperature (°C)
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Figure 7. VOH vs. ISOURCE; VCC = 3.2V
75
100 125
0.5
0.45
3.2
0.4
3.15
0.35
3.1
VOUT (V) e
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VOUT (V) ]
50
Figure 8. VOL vs. ISINK; VCC = 3.2V
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3.25
25
Temperature (°C)
3.05
3
0.3
0.25
0.2
0.15
0.1
2.95
0.05
2.9
0
0
0.2
0.4
0.6
0.8
1
1.2
0
ISOURCE (mA)
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1
2
3
4
5
6
7
ISINK (mA)
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Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS1916 - AS1918 supervisory circuits were designed to generate a reset when the monitored supply voltage falls below its factory-trimmed
trip threshold (see VTH on page 4), and to maintain the reset for a minimum timeout period (see tRP on page 4) after the supply has stabilized.
The integrated watchdog timer (see Watchdog Input on page 8) helps mitigate against bad programming code or clock signals, and/or poor
peripheral response.
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The active-low manual reset input (see Manual Reset Input on page 8) allows for an externally activated system reset.
8.1 RESET/RESETN
Whenever the monitored supply voltage falls below its reset threshold, the RESET output asserts low or the RESETN output asserts high. Once
the monitored voltage has stabilized, an internal timer keeps the reset asserted for the reset timeout period (tRP). After the tRP period, the
RESET/RESETN output returns to its original state (see Figure 10).
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Figure 9. Functional Diagram of VCC Supervisory Application
5
AS1916 - AS1918
VCC
1
Reset Timeout Delay
Generator
+
–
3
MRN
4
1.26V
VCC
Watchdog Transition
Detector
WDI
RESETN/
RESET
Watchdog
Timer
2
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GND
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Figure 10. Reset Timing Diagram
VCC
1V
VTH
VTH
RESETN
tRP
tRD
RESET
GND
tRP
tRD
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Datasheet - D e t a i l e d D e s c r i p t i o n
8.2 Watchdog Input
The integrated watchdog feature can be used to monitor processor activity via pin WDI, and can detect pulses as short as 50ns. The watchdog
requires that the processor toggle the watchdog logic input at regular intervals, within a specified minimum timeout period (1.5s, typ). A reset is
asserted for the reset timeout period. As long as reset is asserted, the timer remains cleared and is not incremented. When reset is deasserted,
the watchdog timer starts counting (Figure 11).
Note: The watchdog timer can be cleared with a reset pulse or by toggling WDI.
tRP
tWD
tRP
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RESETN
tRST
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VCC
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Figure 11. Watchdog Timing Relationship
WDI
The RESET signal is the inverse of the RESETN signal.
The watchdog is internally driven low during most (87.5%) of the watchdog timeout period (see tWD on page 5) and high for the rest of the
watchdog timeout period. When pin WDI is left unconnected, this internal driver clears the watchdog timer every 1.4s. When WDI is tri-stated or
is not connected, the maximum allowable leakage current is 10µA and the maximum allowable load capacitance is 200pF.
Note: The watchdog function can be disabled by leaving pin WDI unconnected or connecting it to a tri-state output buffer.
8.3 Manual Reset Input
The active-low pin MRN is used to force a manual reset. This input can be driven by CMOS logic levels or with open-drain collector outputs.
Pulling MRN low asserts a reset which will remain asserted as long as MRN is kept low, and for the timeout period (see tRP on page 4) after
MRN goes high (140ms min). The manual reset circuitry has an internal 50kΩ pullup resistor, thus it can be left open if not used.
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To create a manual-reset circuit, connect a normally open momentary switch from pin MRN to GND (see Figure 1 on page 1); external debounce
circuitry is not required in this configuration.
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If MRN is driven via long cables or the device is used in a noisy environment, a 0.1µF capacitor between pin MRN and GND will provide
additional noise immunity.
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AS1916 - AS1918
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9 Application Information
9.1 Watchdog Input Current
The watchdog input is driven through an internal buffer and an internal series resistor from the watchdog timer (see Figure 11 on page 8). When
pin WDI is left unconnected (watchdog disabled), the watchdog timer is serviced within the watchdog timeout period (see tWD on page 5) by a
low-high-low pulse from the counter chain.
Note: If WDI is externally driven high for the majority of the timeout period, up to 160µA can flow into pin WDI.
9.2 Interfacing to Bi-Directional CPU Reset Pins
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For minimum watchdog input current (minimum overall power consumption), pull WDI low for most of the watchdog timeout period, pulsing it lowhigh-low once within the first 7/8 (87.5%) of the watchdog timeout period to reset the watchdog timer.
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Since the reset output of the AS1918 is open drain, this device interfaces easily with processors that have bi-directional reset pins. Connecting
the processor reset output directly to the AS1918 RESETN pin with a single pullup resistor (see Figure 12) allows the AS1918 to assert a reset.
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Figure 12. AS1918 RESETN-to-CPU Bi-Directional Reset Pin
VCC
VCC 5
VCC
AS1918
1
CPU
RESETN
RESETN
Reset
Generator
GND
GND 2
9.3 Fast Negative-Going Transients
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Fast, negative-going VCC transients normally do not require the CPU to be shutdown. The AS1916 - AS1918 are virtually immune to such
transients. Resets are issued to the CPU during power-up, powerdown, and brownout conditions.
Note: VCC transients that go 100mV below the reset threshold and last ≤ 55µs typically will not assert a reset pulse.
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9.4 Valid Reset to VCC = 0
The AS1916 - AS1918 are guaranteed to operate properly down to VCC = 1V.
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For AS1916 and AS1917 applications requiring valid reset levels down to VCC = 0, a pulldown resistor to active-low outputs and a pullup resistor
to active-high outputs will ensure that the reset line is valid during the interval where the reset output can no longer sink or source current.
9.5 Watchdog Tips
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Careful consideration should be taken when implementing the AS1916 - AS1918 watchdog feature.
One method of supervising software code execution is to set/reset the watchdog input at different places in the code, rather than pulsing the
watchdog input high-low-high or low-high-low. This method avoids a loop condition in which the watchdog timer would continue to be reset inside
the loop, preventing the watchdog from ever timing out.
Figure 13 shows a flowchart where the input/output driving the watchdog is set high at the beginning of the routine, set low at the beginning of
every subroutine, then set high again when the routine returns to the beginning. If the routine should hang in a subroutine, the problem would
quickly be corrected, since the I/O is continually set low and the watchdog timer is allowed to time out, causing a reset or interrupt to be issued
(see Watchdog Input Current on page 9). This method results in higher averaged WDI input current over time than a case where WDI is held low
for the majority (87.5%) of the timeout period and periodically pulsing it low-high-low.
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AS1916 - AS1918
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Figure 13. Example Watchdog Programming Flowchart
Program
Code
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Subroutine or
Program Loop
Set WDI Low
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Set WDI
High
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Start
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Return
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AS1916 - AS1918
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
10 Package Drawings and Markings
Figure 14. 5-pin SOT23 Marking
Bottom Marking
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Top Marking
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xxxx- encoded Datacode
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Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
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Figure 15. 5-pin SOT23 Package
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Datasheet - O r d e r i n g I n f o r m a t i o n
11 Ordering Information
The devices are available as the standard products shown in Table 5.
Table 5. Ordering Information
Marking
Description
Threshold
Delivery Form
Package
AS1916S-T
ASIO
Active-Low Push/Pull Supervisory Circuit with
Watchdog and Manual Reset
2.93V
Tape and Reel
5-pin SOT23
AS1916R-T
ASIP
Active-Low Push/Pull Supervisory Circuit with
Watchdog and Manual Reset
2.63V
Tape and Reel
AS1916Z-T
ASIQ
Active-Low Push/Pull Supervisory Circuit with
Watchdog and Manual Reset
2.32V
Tape and Reel
AS1916V-T
ASIR
Active-Low Push/Pull Supervisory Circuit with
Watchdog and Manual Reset
1.58V
Tape and Reel
AS1917S-T
ASIS
Active High Push/Pull Supervisory Circuit with
Watchdog and Manual Reset
2.93V
Tape and Reel
AS1917R-T
ASIT
Active High Push/Pull Supervisory Circuit with
Watchdog and Manual Reset
2.63V
Tape and Reel
5-pin SOT23
AS1917Z-T
ASIU
Active High Push/Pull Supervisory Circuit with
Watchdog and Manual Reset
2.32V
Tape and Reel
5-pin SOT23
AS1917V-T
ASIV
Active High Push/Pull Supervisory Circuit with
Watchdog and Manual Reset
1.58V
Tape and Reel
5-pin SOT23
AS1918S-T
ASIW
Active-Low Open Drain Supervisory Circuit with
Watchdog and Manual Reset
2.93V
Tape and Reel
5-pin SOT23
AS1918R-T
ASIX
Active-Low Open Drain Supervisory Circuit with
Watchdog and Manual Reset
2.63V
Tape and Reel
5-pin SOT23
AS1918Z-T
ASIY
Active-Low Open Drain Supervisory Circuit with
Watchdog and Manual Reset
2.32V
Tape and Reel
5-pin SOT23
AS1918V-T
ASIZ
Active-Low Open Drain Supervisory Circuit with
Watchdog and Manual Reset
1.58V
Tape and Reel
5-pin SOT23
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Ordering Code
5-pin SOT23
5-pin SOT23
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5-pin SOT23
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5-pin SOT23
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Note: All products are RoHS compliant.
Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect
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For further information and requests, please contact us mailto:[email protected]
or find your local distributor at http://www.austriamicrosystems.com/distributor
www.austriamicrosystems.com/Supervisors/AS1916
Revision 1.04
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AS1916 - AS1918
Datasheet
Copyrights
Copyright © 1997-2010, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®.
All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of
the copyright owner.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
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Disclaimer
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Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale.
austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding
the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at
any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for
current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range,
unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are
specifically not recommended without additional processing by austriamicrosystems AG for each application. For shipments of less than 100
parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location.
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The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not
be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use,
interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing,
performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of
austriamicrosystems AG rendering of technical or other services.
Headquarters
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Contact Information
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austriamicrosystems AG
Tobelbaderstrasse 30
A-8141 Unterpremstaetten, Austria
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Tel: +43 (0) 3136 500 0
Fax: +43 (0) 3136 525 01
For Sales Offices, Distributors and Representatives, please visit:
http://www.austriamicrosystems.com/contact
www.austriamicrosystems.com/Supervisors/AS1916
Revision 1.04
14 - 14