SGM821 [SGMICRO]
Nano-Power System Timer with Watchdog Function;
| 型号： | SGM821 |
| 厂家： | 
Shengbang Microelectronics Co, Ltd |
| 描述： | Nano-Power System Timer with Watchdog Function |
| 文件： | 总16页 (文件大小：765K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SGM821
Nano-Power System Timer
with Watchdog Function
GENERAL DESCRIPTION
FEATURES
● Supply Voltage Range: 1.8V to 5.5V
● Low Current Consumption: 35nA (TYP)
● Programmable Watchdog Time:
100ms to 8200s (TYP)
The SGM821 is an ultra-low power and programmable
watchdog timer designed for system wake-up in
duty-cycled and battery-powered applications.
The SGM821 with programmable interrupt timer
consumes only 35nA (TYP) system current. Accordingly,
the system can be placed in sleeping mode, consuming
less power, and only returning to active mode when the
device is interrupted. The SGM821 is ideal for wireless
sensor applications or other applications with smaller
batteries compared to the μC that typically costs
micro-amps of total system current. The watchdog
timer of the SGM821 can be programmed by an
external resistor of 500Ω to 180kΩ. And it provides a
corresponding time interval from 100ms to 8200s (TYP).
● Manual Reset Input
● Available in Green SOT-23-6 and TDFN-2×2-6AL
Packages
APPLICATIONS
Low Power Systems
IoT
Tamper Detectors
Smart Home Controllers
Wireless Sensors
The SGM821 is available in Green SOT-23-6 and
TDFN-2×2-6AL packages. It operates over a junction
temperature range of -40℃ to +105℃.
TYPICAL APPLICATION
R1
RP
VDD
VOUT
Power
Management
VDD
RSTn
SGM821
RSTn
μC
C1
VIN
WAKE
DONE
GPIO
GPIO
DELAY/
M_RST
Battery
GND
REXT
GND
GND
Figure 1. Simplified Application Schematic
SG Micro Corp
APRIL2022–REV. A
www.sg-micro.com
Nano-Power System Timer
with Watchdog Function
SGM821
PACKAGE/ORDERING INFORMATION
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
MODEL
DESCRIPTION
SOT-23-6
-40℃ to +105℃
-40℃ to +105℃
SGM821GN6G/TR
RCEXX
Tape and Reel,3000
Tape and Reel,3000
SGM821
RCF
XXXX
TDFN-2×2-6AL
SGM821GTDI6G/TR
MARKING INFORMATION
NOTE: XX = Date Code. XXXX = Date Code and Trace Code.
SOT-23-6
TDFN-2×2-6AL
Serial Number
Y Y Y
X X X X
YYY X X
Date Code - Week
Date Code - Year
Serial Number
Trace Code
Date Code - Year
Green (RoHS & HSF): SG Micro Corp defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If
you have additional comments or questions, please contact your SGMICRO representative directly.
OVERSTRESS CAUTION
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed in Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to
absolute maximum rating conditions for extended periods
may affect reliability. Functional operation of the device at any
conditions beyond those indicated in the Recommended
Operating Conditions section is not implied.
Supply Voltage, VCC............................................. -0.3V to 6V
Input Voltage at Any Pin (1) ......................-0.3V to VCC + 0.3V
Package Thermal Resistance
SOT-23-6, θJA .......................................................... 215℃/W
TDFN-2×2-6AL, θJA.................................................. 106℃/W
Junction Temperature.................................................+150℃
Storage Temperature Range.......................-65℃ to +150℃
Lead Temperature (Soldering, 10s)............................+260℃
ESD Susceptibility
ESD SENSITIVITY CAUTION
This integrated circuit can be damaged by ESD if you don’t
pay attention to ESD protection. SGMICRO recommends that
all integrated circuits be handled with appropriate precautions.
Failureto observe proper handlingand installation procedures
can cause damage. ESD damage can range from subtle
performance degradation tocomplete device failure. Precision
integrated circuits may be more susceptible to damage
because very small parametric changes could cause the
device not to meet its published specifications.
HBM.............................................................................4000V
CDM ............................................................................1000V
RECOMMENDED OPERATING CONDITIONS
Supply Voltage, VCC............................................1.8V to 5.5V
Operating Junction Temperature Range......-40℃ to +105℃
NOTE:
1. The voltage between any two pins is not allowed to be
greater than 6V.
DISCLAIMER
SG Micro Corp reserves the right to make any change in
circuit design, or specifications without prior notice.
SG Micro Corp
www.sg-micro.com
APRIL 2022
2
Nano-Power System Timer
with Watchdog Function
SGM821
PIN CONFIGURATION
(TOP VIEW)
(TOP VIEW)
VDD
GND
1
2
6
5
RSTn
RSTn
WAKE
DONE
VDD
GND
1
2
3
6
5
4
WAKE
GND
DELAY/
M_RST
DELAY/
M_RST
3
4
DONE
SOT-23-6
TDFN-2×2-6AL
PIN DESCRIPTION
PIN
NAME
TYPE
FUNCTION
SOT-23-6 TDFN-2×2-6AL
1
2
6
5
VDD
GND
P
Supply Voltage Pin.
Ground.
G
One-Time External Resistance Detection and Manual Reset Pin. Resistor
connected between this pin and GND is used to set the watchdog timer. The
allowable external resistance ranges from 500Ω to180kΩ. This pin is also
used as an input manual reset pin, and pulling this pin up to VDD will issue
an RSTn signal.
Logic Watchdog Input Pin. Digital signal sent by the external system,
indicating that the WAKE signal is received. This pin is not allowed to be
floating.
DELAY/
M_RST
3
4
4
3
I
I
DONE
Watchdog output (Push-Pull) Pin. A pulse signal is sent at the end of the
programming time interval to wake up the external system.
5
6
2
WAKE
RSTn
GND
O
O
Reset Output (Open-Drain Output) Pin. Digital signal to RESET the external
system. A pull-up resistor is required.
1
Connect the thermal pad to a large-area ground plane. The exposed pad is
internally connected to GND.
—
—
Exposed Pad
NOTE: I = Input, O = Output, G = Ground, P = Power.
SG Micro Corp
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APRIL 2022
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Nano-Power System Timer
with Watchdog Function
SGM821
ELECTRICAL CHARACTERISTICS
(VCC = 2.5V, typical values are at TJ = +25℃, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Power Supply
Operation mode
35
50
nA
Supply Current (1)
IDD
Digital conversion of external resistance
(REXT = 500Ω)
120
150
μA
Timer
Minimum time interval
Maximum time interval
100
8200
±2.3
±4.3
ms
s
Time Interval Period
tIP
VCC = 2.5V, excluding reliability test
VCC = 2.5V, including reliability test
TJ = -40℃ to +105℃
Resistance Detection Accuracy (2)
%
Resistance Detection Accuracy over
Temperature
90
ppm/℃
Resistance Detection Accuracy over Supply
Voltage
±0.02
%/V
VCC = 1.8V to 5.5V
±1.1
±2.1
210
VCC = 2.5V, excluding reliability test
Oscillator Accuracy
%
VCC = 2.5V, including reliability test
Oscillator Accuracy over Temperature
Oscillator Accuracy over Supply Voltage
DONE Pulse Width
TJ = -40℃ to +105℃
ppm/℃
%/V
ns
±0.1
VCC = 1.8V to 5.5V
tDONE
tRSTn
tWAKE
tR_EXT
100
RSTn Pulse Width
320
20
ms
WAKE Pulse Width
ms
Time to Convert REXT
100
120
ms
Digital Logic Levels
Logic High Threshold DONE Pin
Logic Low Threshold DONE Pin
VIH
VIL
0.7 × VCC
V
V
0.3 × VCC
IOUT = 100µA
IOUT = 1mA
VCC - 0.3
VCC - 0.7
Logic Output High Level WAKE Pin
Logic Output Low Level WAKE Pin
VOH
V
V
IOUT = -100µA
IOUT = -1mA
0.3
0.7
0.3
VOL
RSTn Logic Output Low Level
VOL_RSTn IOL = -1mA
IOH_RSTn VOH_RSTn = VCC
VIHM_RST
V
nA
V
RSTn High Level Output Current
Logic High Threshold DELAY/M_RST Pin
1
1.5
NOTES:
1. Current of load and pull-up resistor are not included.
2. This accuracy represents the error of different chip detection results when the external resistance is the same ideal resistance,
excluding the error of the external resistance itself.
SG Micro Corp
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APRIL 2022
4
Nano-Power System Timer
with Watchdog Function
SGM821
TIMING REQUIREMENTS
PARAMETER
SYMBOL
CONDITIONS
Minimum delay (1)
Maximum delay (1)
MIN
TYP
100
MAX
UNITS
ns
DONE to RSTn or WAKE to DONE Delay
tDDONE
tIP - 20ms
20
ms
Debounce Manual Reset
Valid Manual Reset
tDB
ms
tM_RST
20
ms
NOTE: 1. From the falling edge of RSTn or the rising edge of WAKE.
tPOR
VDD
tWAKE
tRWAKE
WAKE
DONE
RSTn
tIP
tDONE
tFWAKE
tDDONE
tRRSTn
tFRSTn
tRSTn
tRSTn + tDB
tIP
tRSTn
tIP
tR_EXT
DELAY/
M_RST
tM_RST
Figure 2. Timing Diagram
SG Micro Corp
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APRIL 2022
5
Nano-Power System Timer
with Watchdog Function
SGM821
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs. Supply Voltage
Supply Current vs. Temperature
65
60
55
50
45
40
35
30
25
80
70
60
50
40
30
20
TJ = -40℃
TJ = +25℃
TJ = +70℃
TJ = +85℃
TJ = +105℃
VCC = 1.8V
VCC = 2.5V
VCC = 5.5V
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
Supply Voltage (V)
-40
-15
10
35
60
85
110
Temperature (℃)
Oscillator Accuracy vs. Temperature
Supply Current vs. Time
2.5%
2.0%
1.5%
1.0%
0.5%
0.0%
-0.5%
-1.0%
1000
100
10
VCC = 1.8V
VCC = 2.5V
VCC = 5.5V
1
0.1
0.01
-40
-15
10
35
60
85
110
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
1
Temperature (℃)
Time (s)
Oscillator Accuracy
Resistance Detection Accuracy
20
16
12
8
25
20
15
10
5
2991 Samples
1 Production Lot
2991 Samples
1 Production Lot
R
EXT = 5.23kΩ
4
0
0
Oscillator Accuracy (%)
Resistance Detection Accuracy (%)
SG Micro Corp
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APRIL 2022
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Nano-Power System Timer
with Watchdog Function
SGM821
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Resistance Detection Accuracy
Resistance Detection Accuracy
25
20
15
10
5
30
24
18
12
6
2991 Samples
1 Production Lot
EXT = 35.14kΩ
2991 Samples
1 Production Lot
REXT = 180kΩ
R
0
0
Resistance Detection Accuracy (%)
Resistance Detection Accuracy (%)
SG Micro Corp
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APRIL 2022
7
Nano-Power System Timer
with Watchdog Function
SGM821
FUNCTIONAL BLOCK DIAGRAM
VDD
RSTn
Oscillator
WAKE
Manual Reset
Detector
Counter
&
Logic Controller
DELAY/
M_RST
DONE
External
Resistance
Detector
GND
Figure 3. Functional Block Diagram
SG Micro Corp
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APRIL 2022
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Nano-Power System Timer
with Watchdog Function
SGM821
DETAILED DESCRIPTION
The SGM821 is a programmable wake-up watchdog
timer with ultra-low power consumption. Besides, it
provides a wide range of timing selections from 100ms
to 8200s (TYP), which is ideal for most applications
driven by interrupt.
RSTn is deasserted, WAKE will not be generated and
the SGM821 is waiting for a valid DONE in this new
cycle. If a valid DONE is recognized, WAKE will be
generated in the next time interval. Otherwise, RSTn
will assert again.
At startup, the SGM821 sets the interrupt time interval
by detecting the resistance of the external resistor
connected between DELAY/M_RST pin and GND one
time. After that, the resistance detection is disabled,
and the watchdog function of SGM821 is realized
through three pins: DONE, WAKE and RSTn. The
SGM821 issues a programmed periodic WAKE pulse to
a μC which is in sleeping or standby mode. And the μC
must issue a DONE signal to the SGM821 within 20ms
before the end of the current interrupt time interval. If a
valid DONE is received, the SGM821 will issue a
WAKE pulse at the beginning of next period. Otherwise,
the RSTn signal will be asserted to reset the μC.
Besides, the manual reset function is also supported by
pulling the DELAY/M_RST pin to VDD.
DONE
The DONE is an input logic pin, and it is not allowed to
be floating. After processing the WAKE signal
successfully, the µC should give a positive DONE pulse.
And the SGM821 will recognize the rising edge of the
DONE pulse. It is recommended to set the pulse width
larger than 100ns. Besides, the SGM821 only
recognizes the first DONE signal when multiple DONE
signals are sent within one time interval. Note that the
DONE signal will not be recognized in the last 20ms of
the current time interval.
If a valid DONE signal is recognized during the WAKE
is still high, the WAKE will falls down as soon as
possible.
tIP
tIP
RSTn
WAKE
The SGM821 provides an open-drain output pin (RSTn)
to meet different µC input voltage requirements.
Therefore, a pull-up resistor is required to implement
the reset interface between the SGM821 and the μC.
To minimize current consumption, a 100kΩ pull-up
resistor is recommended.
Missed DONE
tRSTn
DONE
RSTn
tIP
DELAY/
M_RST
The RSTn signal keeps low during the POR and the
reading of the REXT. After that, the SGM821 asserts
periodic WAKE pulses in response to valid DONE
pulses during normal operating mode. And RSTn will
be triggered to be low in either of the following two
cases:
Figure 4. Watchdog
WAKE
The WAKE is an output signal that is normally low most
of the time. When the programmed time interval starts,
the SGM821 will sent out a WAKE pulse if a valid
DONE has been received in the previous time interval.
If DONE is not recognized in the previous time interval,
the RSTn will assert and WAKE pulse will not be
generated. At the beginning of the first cycle or after
1. If the DELAY/M_RST pin keeps high for at least
20ms (TYP) as a valid manual reset signal.
2. If the DONE is not received at least 20ms before the
next WAKE rising edge (see Figure 4).
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Nano-Power System Timer
with Watchdog Function
SGM821
DETAILED DESCRIPTION (continued)
DELAY/M_RST pin and GND is as short as possible.
Besides, other interfering signal should be kept far
away for good detection. Section Time Interval Period
Programming through External Resistance gives more
information about the calculation of time interval
configuration, and Section Time Interval Period Setting
Error gives examples about the calculation of setting
errors.
Startup and External Resistance Detection
At startup, the SGM821 set the time interval between
two adjacent WAKE pulses (rising edges) by detecting
the resistance of the external resistor (REXT) connected
between DELAY/M_RST pin and GND one time. After
that, the resistance detection is disabled unless the
chip is restarted and powered on again. During this
measurement time, the external resistance detection
block is temporarily working, so the power consumption
of the chip is temporarily high. After detecting, the
external resistance detection block is powered off, the
power consumption goes down. A counter starts
working after POR, and it is timeout after tR_EXT (100ms,
TYP), which indicates the end of external resistance
reading time. The power consumption of the chip
during the resistance reading time is related to the
external resistance, the smaller the resistance, the
greater the power consumption. After the external
resistance reading time (tR_EXT), RSTn remains low for
320ms (TYP) and then goes high. After that, the
SGM821 entering the normal operating mode. See
Figure 5.
Manual Reset
DELAY/M_RST is a multiplex pin. After the POR and
during the reading time of the external resistance, the
resistance detection block is connected. And both of
the resistance detection and manual reset function are
enabled. After the reading of the external resistance,
the resistance detection block is disabled, and DELAY/
M_RST is only used as manual reset pin. The SGM821
provides a manual reset function with a de-bounce
feature that is insensitive to the glitches on the
DELAY/M_RST pin. If DELAY/M_RST is connected to
VDD for at least tM_RST (20ms, TYP), the SGM821
recognizes it as a manual reset condition. After that, the
RSTn is asserted and remains low for tDB + tRSTn. The
digital low status of the RSTn signal may be affected by
an uncertainty of about ±5ms due to the asynchronous
nature of the manual reset signal. And WAKE keeps
low when RSTn is asserted.
tR_EXT
tRSTn
tIP
tIP
WAKE
DONE
RSTn
tIP
WAKE
DONE
DELAY/
M_RST
RSTn
tM_RST Any Reset
POR
tM_RST
tRSTn + tIP
tDB
DELAY/
M_RST
Figure 5. Startup
Valid M_RST
Not Valid M_RST
The recognizable range of external resistance is from
500Ω to 180kΩ. It is not allowed to connect a
capacitance to DELAY/M_RST pin. And it is also
recommended that the trace between the resistor on
Figure 6. Manual Reset
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APRIL 2022
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Nano-Power System Timer
with Watchdog Function
SGM821
DETAILED DESCRIPTION (continued)
Time Interval Period Programming through
External Resistance
To set the time interval below 1 second, the external
Time Interval Period Setting Error
The error of time interval period is mainly consists of
the following two parts: internal oscillator accuracy error
and resistance detection error. It should be pointed out
that this interval period setting error caused by the chip
is discussed here, excluding the error caused by the
external resistance. In order to reduce the error caused
by external resistance, users should use high-precision
resistance as much as possible. The examples below
illustrate the procedure.
resistance REXT is selected according to Table 1.
Table 1. First 9 Time Intervals
tIP (ms)
100
200
300
400
500
600
700
800
900
Resistance (kΩ)
0.5
1
1.5
2
Example 1：
VCC = 2.5V, TJ = +25℃, Target time interval TTARGET1
500ms. Required REXT from according to Table 1, REXT
= 0.5kΩ.
=
2.5
3
3.5
4
Because the first 9 intervals are discrete intervals by
multiples of 100ms, the resistance detecting tolerance
is wide and can be neglect. The oscillator accuracy is
±1.1% (If reliability drift is included, the accuracy is
2.1%), So when REXT = 0.5kΩ, the actual time interval
is:
4.5
To set the time interval over 1 second, the external
resistance REXT is selected according to Equation 1.
REXT = 5.2× T0.3932
(1)
500× 1-1.1% ≤ T (ms) ≤ 500× 1+1.1%
(
)
(
)
IP
494.5 ≤ T (ms) ≤ 505.5
(3)
IP
Users can also calculate the Time Interval Period
through Equation 2 (the inverse function of Equation 1).
Example 2：
VCC = 2.5V, TJ = +25℃, Target time interval TTARGET2
2.543
(2)
T = 0.0153×REXT
=
120s. Required approximate REXT from according to
where:
equation 1, REXT ≈ 34kΩ.
T is the desired time interval in seconds,
The resistance detection accuracy according to the
Electrical Characteristics table is ±2.3% approximately
(If reliability drift is included, the accuracy is 4.3%), the
approximate TIP range excluding Oscillator accuracy is:
R
EXT is the resistance value to use in kΩ.
Figure 9 is provided to facilitate customers to estimate
the REXT
.
200
180
160
140
120
100
80
0.0153×34× 1- 2.3% 2.543 ≤ T (s)
(
)
IP
≤ 0.0153×34× 1+ 2.3% 2.543
(
)
(4)
113.1≤ T (s) ≤ 127.2
IP
The oscillator accuracy is ±1.1% ， so the final
60
40
approximate TIP range is:
20
0
111.1× 1-1.1% ≤ T (s) ≤ 129.4× 1+1.1%
(
)
(
)
IP
(5)
118.8 ≤ T (s) ≤ 128.5
IP
Supply Voltage (V)
Figure 7. REXT vs. Time Interval Period
SG Micro Corp
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APRIL 2022
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Nano-Power System Timer
with Watchdog Function
SGM821
APPLICATION INFORMATION
Power Supply Recommendations
Layout
The SGM821 requires a voltage supply within 1.8V and
5.5V. To immune the power supply noise, an RC
low-pass filter is strongly recommended as Figure 1
show. The recommended resistance value is 10Ω, and
the ceramic X7R capacitor value is 1µF.
Because of the DELAY/M_RST pin is sensitive to
parasitic capacitance when detecting the resistance, it
is recommended that the trace between external
resistor on the pin and GND track is as short as
possible. To improve signal integrity on the WAKE and
RSTn pins, it is also suggested to keep the trace length
between the SGM821 and the μC short.
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (APRIL 2022) to REV.A
Page
Changed from product preview to production data.............................................................................................................................................All
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PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
SOT-23-6
D
e1
e
E1
E
2.59
0.99
b
0.69
0.95
RECOMMENDED LAND PATTERN (Unit: mm)
L
A2
A
ccc
C
SEATING PLANE
A1
c
θ
C
0.25
Dimensions In Millimeters
Symbol
MIN
-
MOD
MAX
1.450
0.150
1.300
0.500
0.220
3.050
1.750
3.000
A
A1
A2
b
-
0.000
0.900
0.300
0.080
2.750
1.450
2.600
-
-
-
c
-
D
-
E
-
E1
e
-
0.950 BSC
e1
L
1.900 BSC
0.300
0°
-
-
0.600
8°
θ
ccc
0.100
NOTES:
1. This drawing is subject to change without notice.
2. The dimensions do not include mold flashes, protrusions or gate burrs.
3. Reference JEDEC MO-178.
SG Micro Corp
TX00034.001
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PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
TDFN-2×2-6AL
D
e
N6
L
D1
E1
E
N3
N1
b
BOTTOM VIEW
TOP VIEW
1.60
0.55
1.00
2.60
A
A1
A2
SIDE VIEW
0.30
0.65
RECOMMENDED LAND PATTERN (Unit: mm)
Dimensions
In Millimeters
Dimensions
In Inches
Symbol
MIN
MAX
0.800
0.050
MIN
MAX
0.031
0.002
A
A1
A2
D
0.700
0.000
0.028
0.000
0.203 REF
0.008 REF
1.900
1.500
1.900
0.900
0.250
2.100
1.700
2.100
1.100
0.350
0.075
0.059
0.075
0.035
0.010
0.083
0.067
0.083
0.043
0.014
D1
E
E1
b
e
0.650 BSC
0.026 BSC
L
0.174
0.326
0.007
0.013
SG Micro Corp
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TX00132.000
PACKAGE INFORMATION
TAPE AND REEL INFORMATION
REEL DIMENSIONS
TAPE DIMENSIONS
P2
P0
W
Q2
Q4
Q2
Q4
Q2
Q4
Q1
Q3
Q1
Q3
Q1
Q3
B0
Reel Diameter
P1
A0
K0
Reel Width (W1)
DIRECTION OF FEED
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF TAPE AND REEL
Reel Width
Reel
Diameter
A0
B0
K0
P0
P1
P2
W
Pin1
Package Type
W1
(mm)
(mm) (mm) (mm) (mm) (mm) (mm) (mm) Quadrant
SOT-23-6
7″
7″
9.5
9.5
3.17
2.30
3.23
2.30
1.37
1.10
4.0
4.0
4.0
4.0
2.0
2.0
8.0
8.0
Q3
Q1
TDFN-2×2-6AL
SG Micro Corp
TX10000.000
www.sg-micro.com
PACKAGE INFORMATION
CARTON BOX DIMENSIONS
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF CARTON BOX
Length
(mm)
Width
(mm)
Height
(mm)
Reel Type
Pizza/Carton
7″ (Option)
7″
368
442
227
410
224
224
8
18
SG Micro Corp
www.sg-micro.com
TX20000.000
相关型号：
SGM8249-1
8MHz, High Voltage, High Precision, Low Noise, Rail-to-Rail Output Operational Amplifier
SGMICRO
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