SGM815 [SGMICRO]
Ultra-Low Power Voltage Detectors with Optional Watchdog;
| 型号： | SGM815 |
| 厂家： | 
Shengbang Microelectronics Co, Ltd |
| 描述： | Ultra-Low Power Voltage Detectors with Optional Watchdog |
| 文件： | 总20页 (文件大小：1423K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SGM814/SGM815/SGM816
Ultra-Low Power Voltage Detectors
with Optional Watchdog
GENERAL DESCRIPTION
FEATURES
The SGM814, SGM815 and SGM816 are a family of
complete microprocessor supervisory devices which
combine ultra-low power, supervisory circuits and timer
circuits. System reliability is significantly improved by
such integration compared to the designs using
individual ICs or discrete components. These devices
feature a wide supply voltage from 1V to 5V.
Regardless of whether the detection voltage is high or
low, the output can be forced low through the manual
reset pin (nMR).
● High Accuracy Fixed Detection Options: 1.2V,
1.5V, 1.6V, 2V and 3.3V
● High Trigger Accuracy: 1% (TYP)
● Low Quiescent Current: 1.6μA (TYP)
● Low nRESET Defined Input Voltage: 0.5V
● Delay Time for the Power-on Reset Generator:
140ms
● Reset Output Options:
Open-Drain: SGM814 and SGM815
Push-Pull: SGM816
● Available in a Green SOT-23-6 Package
If the supply voltage (VDD) exceeds 0.5V during the
power-on period, nRESET will assert low. And when
APPLICATIONS
VDD is under the default voltage threshold, the nRESET
output keeps low. The VHYS design on VDD can avoid
nRESET triggering by mistake.
Microprocessor Systems
Controllers
Battery-Powered Systems
Portable Equipment
The SGM814 and SGM815 both have an active-low
open-drain reset output, and can monitor two different
voltages, either PFI or SENSE trigger the threshold, the
nRESET will assert. The SGM816 has an active-low
push-pull reset output and a watchdog timer to monitor
the process.
Instruments and Apparatus
Communications-Equipment
TYPICAL APPLICATION
3.3V
1.6V
The devices are available in a Green SOT-23-6
package. They operate over a junction temperature
range of -40℃ to +125℃.
VDD
VCORE
VIO
R3
SGM815-3.3
DSP
nRESET
R1
nMR
SENSE
nRSTVDD
nRSTSENSE
GND
R2
GND
Figure 1. Typical Application Circuit Example
AVAILABLE OPTIONS
nRSTSENSE,
nRSTVDD Output
Device nRESET Output
nPFO Output WDI Input PFI Input nMR Input SENSE Input
SGM814
SGM815
SGM816
√ (Open-Drain)
√ (Open-Drain)
√
√
√
√
√ (Open-Drain)
√
√
√ (Push-Pull)
√
SG Micro Corp
www.sg-micro.com
JUNE2022–REV. A
SGM814
SGM815/SGM816
Ultra-Low Power Voltage Detectors
with Optional Watchdog
PACKAGE/ORDERING INFORMATION
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
MODEL
DESCRIPTION
SOT-23-6
SOT-23-6
SOT-23-6
SOT-23-6
SOT-23-6
SOT-23-6
SOT-23-6
SOT-23-6
SOT-23-6
SGM814-1.2
SGM814-1.5
SGM814-2.0
SGM814-3.3
SGM815-1.6
SGM815-3.3
SGM816-1.2
SGM816-1.5
SGM816-3.3
SGM814-1.2XN6G/TR
SGM814-1.5XN6G/TR
SGM814-2.0XN6G/TR
SGM814-3.3XN6G/TR
SGM815-1.6XN6G/TR
SGM815-3.3XN6G/TR
SGM816-1.2XN6G/TR
SGM816-1.5XN6G/TR
SGM816-3.3XN6G/TR
G6DXX
G6GXX
OU9XX
G6HXX
G6IXX
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
-40℃ to +125℃
-40℃ to +125℃
-40℃ to +125℃
-40℃ to +125℃
-40℃ to +125℃
-40℃ to +125℃
-40℃ to +125℃
-40℃ to +125℃
-40℃ to +125℃
G5LXX
SWXXX
G6LXX
G6MXX
MARKING INFORMATION
NOTE: XX = Date Code.
YYY X X
Date Code - Week
Date Code - Year
Serial Number
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.
SG Micro Corp
www.sg-micro.com
JUNE 2022
2
SGM814
SGM815/SGM816
Ultra-Low Power Voltage Detectors
with Optional Watchdog
ABSOLUTE MAXIMUM RATINGS
OVERSTRESS CAUTION
Supply Voltage, VDD............................................. -0.3V to 6V
nMR, nRESET (Push-Pull), VnMR, VnRESET (Push-Pull)
.................................................................-0.3V to VDD + 0.3V
All Other Pins....................................................... -0.3V to 6V
Maximum Low Output Current, IOL................................±5mA
Maximum High Output Current, IOH...............................±5mA
Input Current, IIK (VSENSE < 0V or VSENSE > VDD)..........±10mA
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.
Output Current, IOK (VOUT < 0V or VOUT > VDD
)
(2) ........±10mA
ESD SENSITIVITY CAUTION
Package Thermal Resistance
This integrated circuit can be damaged if ESD protections are
not considered carefully. 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 even small parametric changes could cause the
device not to meet the published specifications.
SOT-23-6, θJA .......................................................... 230℃/W
Junction Temperature.................................................+150℃
Storage Temperature Range.......................-65℃ to +150℃
Lead Temperature (Soldering, 10s)............................+260℃
ESD Susceptibility
HBM (SGM814, SGM815) ...........................................1500V
HBM (SGM816) ...........................................................3000V
CDM ............................................................................1000V
NOTES:
DISCLAIMER
1. To ensure the reliable running of the device, the continuous
running time of the device at 5V cannot exceed t = 1000h.
2. For push-pull outputs, the output is clamped by the back
gate diodes inside to the IC, and there is no clamp in the
open-drain outputs.
SG Micro Corp reserves the right to make any change in
circuit design, or specifications without prior notice.
RECOMMENDED OPERATING CONDITIONS
Supply Voltage, VDD..................................................1V to 5V
SENSE Voltage, VSENSE .......................................... 0V to VDD
WDI
High-level Input Voltage (VIH) at nMR ..........0.8 × VDD (MIN)
Low-level Input Voltage (VIL) at nMR ......... 0.3 × VDD (MAX)
Input Transition Rise and Fall Rates at Δt/ΔV at nMR
.....................................................................100ns/V (MAX)
nMR, PFI Voltage ................................................... 0V to VDD
Operating Junction Temperature Range......-40℃ to +125℃
SG Micro Corp
www.sg-micro.com
JUNE 2022
3
SGM814
SGM815/SGM816
Ultra-Low Power Voltage Detectors
with Optional Watchdog
PIN CONFIGURATION AND DESCRIPTION
SGM814 (TOP VIEW)
nRESET
GND
1
2
3
6
5
4
VDD
nPFO
PFI
nMR
SOT-23-6
Table 1. SGM814 Pin Description
PIN
1
NAME
nRESET
GND
I/O
O
G
I
FUNCTION
Active-Low Open-Drain Reset Output Pin.
Ground.
2
Manual Reset Input Pin. nRESET keeps low when nMR is low. When nMR is high, nRESET
becomes high after a timeout period. Leave it floating or connect it to VDD if not used.
3
nMR
Power-Fail Voltage Monitor Input Pin. When PFI is less than 0.551V, nPFO goes low. Connect it
to VDD if not used.
4
PFI
I
Power-Fail Output Pin. Power-fail output goes low and sinks current when PFI is less than
0.551V; otherwise nPFO stays high.
5
nPFO
VDD
O
I
6
Power Supply Voltage Pin. Monitor the voltage on VDD.
NOTE: I: input, O: output, G: ground.
Table 2. SGM814 Function Table
nMR
L
VPFI > 0.551V
VDD > VIT-
nRESET
nPFO
0
1
0
0
1
1
X (1)
L
L
L
H
L
L
X
H
0
L
H
1
H
L
L
H
0
H
H
H
1
H
NOTE:
1. X = Don’t care.
SG Micro Corp
www.sg-micro.com
JUNE 2022
4
SGM814
SGM815/SGM816
Ultra-Low Power Voltage Detectors
with Optional Watchdog
PIN CONFIGURATION AND DESCRIPTION (continued)
SGM815 (TOP VIEW)
nRSTVDD
GND
1
2
3
6
5
4
VDD
nRSTSENSE
SENSE
nMR
SOT-23-6
Table 3. SGM815 Pin Description
PIN
1
NAME
nRSTVDD
GND
I/O
O
FUNCTION
Active-Low Open-Drain Reset Output Pin. The logic level is related to VDD and nMR state.
Ground.
2
G
Manual Reset Input Pin. Pull it low to force a reset. nRSTVDD and nRSTSENSE keeps low
when nMR is low. When nMR is high, nRESET becomes high after a timeout period. Leave it
floating or connect it to VDD if not used.
3
nMR
I
Sense Voltage Pin. If the voltage is below 0.551V, the reset asserts. Connect it to VDD if not
used.
4
5
6
SENSE
nRSTSENSE
VDD
I
O
I
Active-Low Open-Drain Reset Output Pin. The logic level is related to SENSE voltage and
nMR state.
Power Supply Voltage Pin. Monitor the voltage on VDD.
NOTE: I: input, O: output, G: ground.
Table 4. SGM815 Function Table
nMR
L
VSENSE > 0.551V
VDD > VIT-
nRSTVDD
nRSTSENSE
X (1)
X
0
1
0
1
L
L
L
L
H
0
H
0
H
L
L
H
1
H
H
H
1
H
NOTE:
1. X = Don’t care.
SG Micro Corp
www.sg-micro.com
JUNE 2022
5
SGM814
SGM815/SGM816
Ultra-Low Power Voltage Detectors
with Optional Watchdog
PIN CONFIGURATION AND DESCRIPTION (continued)
SGM816 (TOP VIEW)
nRESET
GND
1
2
3
6
5
4
VDD
WDI
nMR
SENSE
SOT-23-6
Table 5. SGM816 Pin Description
PIN
1
NAME
nRESET
GND
I/O
O
FUNCTION
Active-Low Push-Pull Reset Output Pin.
Ground.
2
G
Manual Reset Input Pin. Pull it low to force a reset. nRESET keeps low when nMR is low.
When nMR is high, nRESET becomes high after a timeout period. Leave it floating or
connect it to VDD if not used.
Sense Voltage Pin. If the voltage is below 0.551V, the reset asserts. Connect it to VDD if not
used.
3
4
nMR
I
I
SENSE
Watchdog Timer Input Pin. If the WDI remains high or low for more than the watchdog
timeout period, the watchdog timer expires. The internal watchdog timer is kept clear while a
reset is asserted. The timer is also cleared if the WDI input is changed (on rising or falling
edges).
5
6
WDI
VDD
I
I
Power Supply Voltage Pin. Monitor the voltage on VDD.
NOTE: I: input, O: output, G: ground.
Table 6. SGM816 Function Table (1)
nMR
L
VSENSE > 0.551V
VDD > VIT-
nRESET
X (2)
X
0
1
0
1
L
L
L
L
H
H
0
H
0
H
1
H
1
NOTES:
1. The watchdog timer function is not included.
2. X = Don’t care.
SG Micro Corp
www.sg-micro.com
JUNE 2022
6
SGM814
SGM815/SGM816
Ultra-Low Power Voltage Detectors
with Optional Watchdog
ELECTRICAL CHARACTERISTICS
(TJ = -40℃ to +125℃, typical values are at TJ = +25℃, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
VDD = 3.3V, IOH = -3mA
MIN
TYP
MAX
UNITS
0.8 × VDD
0.8 × VDD
0.8 × VDD
0.8 × VDD
VDD = 1.8V, IOH = -2mA
VDD = 1.5V, IOH = -1mA
VDD = 1.2V, IOH = -0.4mA
VDD = 3.3V, IOL = 3mA
VDD = 1.5V, IOL = 2mA
VDD = 1.2V, IOL = 1mA
VDD = 1V, IOL = 500μA
VDD = 0.5V, IOL = 5μA
SGM81x-1.2
High-Level Output Voltage
VOH
V
0.3
0.3
Low-Level Output Voltage
VOL
VOL
V
V
0.3
0.3
Low-Level Output Voltage (nRESET Only)
0.1
1.131
1.420
1.506
1.825
2.911
1.108
1.391
1.476
1.788
1.142
1.434
1.521
1.843
2.941
1.154
1.449
1.537
1.861
2.971
1.176
1.477
1.566
1.898
SGM81x-1.5
SGM81x-1.6
SGM81x-2.0
SGM81x-3.3
SGM81x-1.2
SGM81x-1.5
SGM81x-1.6
SGM81x-2.0
SGM81x-3.3
TJ = +25℃
Negative-Going Input Threshold Voltage (1)
VIT-
V
TJ = -40℃ to +125℃
2.852
0.534
3.030
0.568
Negative-Going Input Threshold Voltage (1)
(SENSE, PFI)
0.551
TJ = +25℃
VIT-(S)
V
0.523
0.579
TJ = -40℃ to +125℃
TJ = -40℃ to +125℃
Temperature Coefficient of VIT-, PFI, SENSE
TK
-0.003
-0.019
%/K
Hysteresis Accuracy at VDD Input
Hysteresis at SENSE, PFI Input
High-Level Input Current (nMR)
High-Level Input Current (SENSE, PFI)
High-Level Input Current (WDI)
Low-Level Input Current (nMR)
Low-Level Input Current (SENSE, PFI)
Low-Level Input Current (WDI)
VHYS/VIT-
1.5
15
%
VHYS(S) VDD ≥ 1V
nMR = VDD, VDD = 3.3V
mV
-50
-40
-60
-39
-30
-75
50
40
60
-25
30
75
IIH
SENSE, PFI = VDD, VDD = 3.3V
WDI = VDD, VDD = 3.3V
nA
nMR = 0V, VDD = 3.3V
-32
μA
IIL
SENSE, PFI, WDI = 0V, VDD = 3.3V
WDI = 0V, VDD = 3.3V
nA
High-Level Output Current at nRESET(2)
(Open-Drain)
IOH
VDD = VIT- + 0.2V, VOH = 3.3V
200
4.5
5
nA
VDD = 1V
(average current)
VDD = 2V
1.6
1.7
1.8
2
(average current)
VDD = 3.6V
Supply Current
IDD
μA
TJ = -40℃ to +125℃
5
(average current)
VDD = 5.0V
(average current)
5
Internal Pull-Up Resistor at nMR
RnMR
CIN
70
100
4
130
kΩ
Input Capacitance at nMR, SENSE, PFI, WDI
VIN = 0V to VDD
pF
NOTES:
1. Place a 0.1μF bypass capacitor near VDD to ensure the stability of the threshold voltage.
2. Also refers to nRSTVDD and nRSTSENSE.
SG Micro Corp
www.sg-micro.com
JUNE 2022
7
SGM814
SGM815/SGM816
Ultra-Low Power Voltage Detectors
with Optional Watchdog
TIMING REQUIREMENTS
(At RL = 1MΩ, CL = 50pF and TJ = -40℃ to +125℃, unless otherwise noted.)
PARAMETER
Timeout Period at WDI
SYMBOL
CONDITIONS
MIN
0.5
40
2
TYP
MAX
UNITS
tT_OUT
1.2
1.9
s
Pulse Duration at VDD
Pulse Duration at nMR
Pulse Duration at SENSE
Pulse Duration at PFI
Pulse Duration at WDI
V
IH = 1.1 × VIT-, VIL = 0.9 × VIT-, VIT- = 1.142V
VDD ≥ VIT- + 0.2V, VIL = 0.3 × VDD, VIH = 0.8 × VDD
VDD ≥ VIT-, VIH = 1.1 × VIT-(S), VIL = 0.9 × VIT-(S)
VIH = 1.1 × VIT-(S), VIL = 0.9 × VIT-(S)
tW
25
25
0.2
μs
VDD ≥ VIT-, VIL = 0.3 × VDD, VIH = 0.7 × VDD
SWITCHING CHARACTERISTICS
(At RL = 1MΩ, CL = 50pF and TJ = -40℃ to +125℃, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
VDD ≥ 1.1 × VIT-, nMR = 0.8 × VDD, see Timing
Requirements
Delay Time
tD
40
140
250
ms
VDD to nRESET or nRSTVDD Propagation
Delay Time, High-to-Low Level Output
SENSE to nRESET or nRSTSENSE
Propagation Delay Time, High-to-Low Level tPHL_SENSE VIH = 1.1 × VIT-, VIL = 0.9 × VIT-
Output
tPHL_VDD VIH = 1.1 × VIT-, VIL = 0.9 × VIT-
50
20
μs
μs
PFI to nPFO Propagation Delay Time,
tPHL_nPFO VIH = 1.1 × VIT-, VIL = 0.9 × VIT-
High-to-Low Level Output
PFI to nPFO Propagation Delay Time,
tPLH_nPFO VIH = 1.1 × VIT-, VIL = 0.9 × VIT-
Low-to-High Level Output
20
μs
μs
550
nMR to nRESET, nRSTVDD, nRSTSENSE
Propagation Delay Time, High-to-Low Level
Output
tPHL_MR
VDD ≥ VIT-, VIL = 0.3 × VDD, VIH = 0.8 × VDD
1
1.5
μs
VDD
VIT- + VHYS
VIT-
0.5V
t
tD
tD
tD
nRESET
Output Condition
Undefined
Output Condition
Undefined
t
nMR
t
Figure 2. nRESET Timing Diagram for SGM814
SG Micro Corp
JUNE 2022
www.sg-micro.com
8
SGM814
SGM815/SGM816
Ultra-Low Power Voltage Detectors
with Optional Watchdog
SWITCHING CHARACTERISTICS (continued)
PFI
VIT-(S) + VHYS-(S)
VIT-(S) = 0.551V
t
nPFO
Output Condition
Undefined
Output Condition
Undefined
t
Figure 3. nPFO Timing Diagram for SGM814
VDD
VIT- + VHYS
VIT-
0.5V
t
tD
tD
nRSTVDD
Output Condition
Undefined
Output Condition
Undefined
t
SENSE
VIT-(S) + VHYS(S)
VIT-(S) = 0.551V
t
tD
nRSTSENSE
Output Condition
Undefined
Output Condition
Undefined
t
tD
nMR
t
Figure 4. Timing Diagram for SGM815
SG Micro Corp
www.sg-micro.com
JUNE 2022
9
SGM814
SGM815/SGM816
Ultra-Low Power Voltage Detectors
with Optional Watchdog
SWITCHING CHARACTERISTICS (continued)
VDD
VIT- + VHYS
VIT-
0.5V
t
t
SENSE
VIT-(S) + VHYS(S)
V
IT-(S) = 0.551V
tD
tD
tD
tD
tD
nRESET
Output Condition
Undefined
Output Condition
Undefined
t
tT_OUT
WDI
X
t
t
X = Don’t care
nMR
Figure 5. Timing Diagram for SGM816
SG Micro Corp
www.sg-micro.com
JUNE 2022
10
SGM814
SGM815/SGM816
Ultra-Low Power Voltage Detectors
with Optional Watchdog
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs. Supply Voltage
Output Voltage vs. Supply Voltage
7
6
5
4
3
2
1
0
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
SGM814-3.3, RPULL = 100kΩ
nMR, nRESET: Open, SENSE = VDD, WDI: triggered
TJ = -40℃
TJ = 0℃
TJ = -40℃
TJ = 0℃
TJ = +25℃
TJ = +85℃
TJ = +105℃
TJ = +125℃
TJ = +25℃
TJ = +85℃
TJ = +105℃
TJ = +125℃
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
Supply Voltage (V)
Supply Voltage (V)
Low-Level Output Voltage vs. Low-Level Output Current
0.40
Low-Level Output Voltage vs. Low-Level Output Current
1.0
VDD = 1.2V, SENSE, nMR = GND, WDI: GND
VDD = 3.3V, SENSE, nMR = GND, WDI: GND
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
TJ = -40℃
TJ = 0℃
TJ = -40℃
TJ = 0℃
TJ = +25℃
TJ = +85℃
TJ = +105℃
TJ = +125℃
TJ = +25℃
TJ = +85℃
TJ = +105℃
TJ = +125℃
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
Low-Level Output Current (mA)
0
1
2
3
4
5
6
7
8
9
10 11 12
Low-Level Output Current (mA)
Low-Level Output Voltage vs. Low-Level Output Current
0.9
High-Level Output Voltage vs. High-Level Output Current
1.22
VDD = 5.0V, SENSE, nMR = GND, WDI: GND
VDD = 1.2V, SENSE, nMR = VDD, WDI: triggered
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1.20
1.18
1.16
1.14
1.12
1.10
TJ = -40℃
TJ = 0℃
TJ = +25℃
TJ = +85℃
TJ = +105℃
TJ = +125℃
TJ = -40℃
TJ = 0℃
TJ = +25℃
TJ = +85℃
TJ = +105℃
TJ = +125℃
0
2
4
6
8
10
12
14
0
0.1
0.2
0.3
0.4
0.5
Low-Level Output Current (mA)
High-Level Output Current (mA)
SG Micro Corp
www.sg-micro.com
JUNE 2022
11
SGM814
SGM815/SGM816
Ultra-Low Power Voltage Detectors
with Optional Watchdog
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
High-Level Output Voltage vs. High-Level Output Current
3.4
High-Level Output Voltage vs. High-Level Output Current
5.1
5.0
4.9
4.8
4.7
4.6
VDD = 3.3V, SENSE, nMR = VDD, WDI: triggered
VDD = 5V, SENSE, nMR = VDD, WDI: triggered
3.3
3.2
3.1
3.0
2.9
2.8
TJ = -40℃
TJ = 0℃
TJ = -40℃
TJ = 0℃
TJ = +25℃
TJ = +85℃
TJ = +105℃
TJ = +125℃
TJ = +25℃
TJ = +85℃
TJ = +105℃
TJ = +125℃
0
2
4
6
8
10
0
2
4
6
8
10
High-Level Output Current (mA)
High-Level Output Current (mA)
Minimum Pulse Duration at VDD vs. Threshold Overdrive Voltage
VDD Normalized Threshold Voltage vs. Temperature
50
1.005
1.004
1.003
1.002
1.001
1.000
0.999
0.998
0.997
0.996
0.995
nMR Open, SENSE = VDD
40
30
VDD = 3.3V
20
VDD = 1.2V
10
0
0
0.1
0.2
0.3
0.4
0.5
-40 -25 -10
5
20 35 50 65 80 95 110 125
Threshold Overdrive Voltage (V)
Temperature (℃)
Hysteresis Accuracy at VDD Input vs. Temperature
SENSE, FPI Threshold Voltage vs. Temperature
1.410
1.405
1.400
1.395
1.390
1.385
1.380
1.375
1.370
1.365
1.360
552.4
552.2
552.0
551.8
551.6
551.4
551.2
551.0
-40 -25 -10
5
20 35 50 65 80 95 110 125
-40 -25 -10
5
20 35 50 65 80 95 110 125
Temperature (℃)
Temperature (℃)
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SGM814
SGM815/SGM816
Ultra-Low Power Voltage Detectors
with Optional Watchdog
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Hysteresis at SENSE, FPI Input vs. Temperature
22
Delay Time vs. Temperature
160
155
150
145
140
135
130
125
120
21
20
19
18
17
16
15
14
13
12
11
-40 -25 -10
5
20 35 50 65 80 95 110 125
-40 -25 -10
5
20 35 50 65 80 95 110 125
Temperature (℃)
Temperature (℃)
SG Micro Corp
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JUNE 2022
13
SGM814
SGM815/SGM816
Ultra-Low Power Voltage Detectors
with Optional Watchdog
FUNCTIONAL BLOCK DIAGRAMS
VDD
+
nRESET
Reset Logic
and Timer
Voltage
Reference
nMR
PFI
+
nPFO
V
REF = 0.551V
Voltage
Reference
GND
Figure 6. SGM814 Block Diagram
VDD
+
nRSTVDD
Voltage
Reference
Reset Logic
and Timer
nMR
nRSTSENSE
SENSE
+
VREF = 0.551V
Voltage
Reference
GND
Figure 7. SGM815 Block Diagram
VDD
VDD
+
Voltage
Reference
Reset Logic
and Timer
nRESET
nMR
SENSE
+
VREF = 0.551V
Voltage
Reference
Watchdog Logic
and Control
WDI
GND
Figure 8. SGM816 Block Diagram
SG Micro Corp
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JUNE 2022
14
SGM814
SGM815/SGM816
Ultra-Low Power Voltage Detectors
with Optional Watchdog
DETAILED DESCRIPTION
neglected and minimize the resistor power
consumption, the sum of two resistors should be about
1MΩ. To ensure the accuracy of the detection voltage,
the tolerance of the external resistor should be less
than 1%. It is recommended to leave nPFO floating and
connect PFI to VDD if the PFI comparator is not used.
Manual Reset (nMR)
The manual reset (nMR) input allows the operator, test
technician, or external logic circuit to initiate a reset. A
logic low on nMR forces the nRESET low. After nMR
returns to a logic high, nRESET is deasserted after a
reset delay time period (tD). nMR is pulled up to VDD
with an internal 100kΩ resistor. This pin can be floating
if nMR is not used. It is recommended to connect a
0.1μF capacitor between nMR pin and GND to reduce
ambient noise interference.
SENSE (SGM815 and SGM816 Only)
A 0.551V reference voltage is intergraded in sense
block, then the voltage at SENSE input will compare
with it. If the SENSE voltage falls below VIT-(S), the
nRESET goes low. For the SGM815, there is a
dedicated nRSTSENSE output. For the SGM816, the
logic signal of SENSE is OR-wired with the signal of
VDD or nMR. Once the sensed voltage exceeds
0.551V plus a hysteresis of about 15mV, the output
returns to the inactive state after a fixed delay by the
internal timer.
PFI, nPFO (SGM814 Only)
For SGM814, PFI (Power-Fail Input) and nPFO
(Power-Fail Open-Drain Output) pins can be used for
power-fail warning or monitoring a power supply other
than the device power supply, and doesn’t affect
nRESET pin.
The internal voltage reference (0.551V) is used for
compare with PFI pin, once the PFI voltage is lower
than the negative-going input threshold voltage (VIT-(S)),
the nPFO goes low. Once PFI voltage exceeds 0.551V
plus a hysteresis of about 15mV, the output goes high.
Connecting a resistor divider externally can monitor any
voltage above 0.551V.
Watchdog (SGM816 Only)
A watchdog timer is integrated in SGM816 only. It must
be periodically triggered by a rising edge or a falling
edge of WDI. If the monitoring system cannot retrigger
the watchdog circuit during the timeout period, the
nRESET becomes active within the tD period, which will
also clear the watchdog timer.
To assure the PFI pin leakage current compared with
the current through the resistor divider can be
SG Micro Corp
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JUNE 2022
15
SGM814
SGM815/SGM816
Ultra-Low Power Voltage Detectors
with Optional Watchdog
APPLICATION INFORMATION
The SGM814, SGM815 and SGM816 are excellent
voltage detectors that integrate a manual reset pin. The
SGM814 and SGM815 have an active-low open-drain
reset output, and the SGM816 has an active-low
push-pull reset output. For the SGM814, the PFI and its
corresponding nPFO can be used to monitor power
supplies other than the input power supply. It also has a
short delay time that can realize more direct trigger
output. While the SGM815 has a SENSE input and
corresponding output (nRSTSENSE) to monitor two
different voltages, and its delay time is longer than the
SGM814 which can reduce accidental triggering of the
output. The SGM816 features a watchdog timer to
monitor the running of the microprocessor.
VTRIP
(1)
R = R ×
-1
1
2
V
IT-(S)
where:
VTRIP is the battery voltage when a reset is asserted.
IT-(S) is the SENSE threshold voltage (0.551V).
R1 is selected for a resistor current within 1μA.
V
When VTRIP is 1.6V, R1 is 1.9 × R2. Therefore, R1 is
820kΩ and R2 is 430kΩ.
Power Supply Recommendations
The devices operate with a wide input range from 1V to
5V. A 0.1μF ceramic capacitor is recommended
between the VDD and GND pin to reduce the input
supply noise.
VDD
R3
Typical Application Example
SGM814-1.2
R1
nMR
VIN+
2-Cell
NiMH
PFI
nRESET
nPFO
VDD
VDD
R1
Reset Output
R3
R4
SGM814-2.0
DSP
R2
Analog
Circuit
GND
Px.x
PFI nRESET
nRESET
nMR
nPFO
GND
Py.x
R2
GND
VIN-
Figure 9. Battery Monitoring with Low Supply Current
R2
R1
(2)
VTH_ VIN− = 0.551V -
V
- 0.551V
(
)
DD
Design Requirements
NOTE: 1. R3 and R4 can be integrated in a microcontroller.
Both the SGM814 and SGM815 are suitable for some
applications that need low quiescent current during the
reset period. The SGM815 has two reset outputs,
nRSTVDD and nRSTSENSE, which are triggered by
the monitoring result of VDD voltage and the monitoring
result of SENSE voltage respectively. The SGM814-1.2
used to monitor the input voltage of battery is shown in
Figure 9. The threshold voltage VIT- is 1.142V. Select
low VIT- to ensure the supply voltage higher than the
VDD threshold voltage. And the battery voltage can be
monitored by the SENSE pin.
Figure 10. SGM814 Monitoring a Negative Voltage
3.3V
1.5V
VDD
VCORE
VIO
DSP
SGM816-3.3
nMR
nRESET
nRESET
R1
R2
SENSE
WDI
Px.y
GND
GND
Detailed Design Process
R1 + R2
R2
(3)
VTH_ CORE = 0.551V ×
The voltage divider can be calculated by Equation 1,
asserting a reset using the nRSTSENSE output at 2 ×
0.8V = 1.6V.
Figure 11. SGM816 in a DSP-System Monitoring Both
Supply Voltages
SG Micro Corp
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JUNE 2022
16
SGM814
SGM815/SGM816
Ultra-Low Power Voltage Detectors
with Optional Watchdog
APPLICATION INFORMATION (continued)
form parasitic inductance, then the parasitic inductance
Layout
and the VDD capacitor will form an LC resonant circuit
which will cause a ringing with peak voltages higher
than the maximum VDD value.
It is recommended to connect the VDD decoupling
capacitor to the device as close as possible. Use short
and wide PCB traces for the VDD supply node.
Because the trace between VDD and the capacitor will
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (MAY 2022) to REV.A
Page
Changed from product preview to production data.............................................................................................................................................All
SG Micro Corp
www.sg-micro.com
JUNE 2022
17
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
www.sg-micro.com
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″
9.5
3.17
3.23
1.37
4.0
4.0
2.0
8.0
Q3
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
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