Low Power, Low Voltage
PIR and Vibration Sensor AFE
The SGM8139 is a low voltage low power analog front
end designed for PIR and vibration sensors. This part
integrates two high input impedance operational
amplifiers, window comparator, state control logic, a
delay timer, a latch timer, a voltage reference and high
current output stages. It can be used in various sensors,
delay controllers as well as wake-up circuit in low
power consumption systems.
Many industrial and building automation systems use
motion detectors to control different functions based on
human presence. Using SGM8139 with proper PIR
sensor, it is easy to build a compact passive infrared
detection system. The output stage of SGM8139 can
easily drive different types of lights, buzzers, automatic
doors, fans and white goods with programmable timers.
It is especially suitable for office buildings, hotels,
shopping malls or automatic lighting and alarm systems,
as well as intrusion detection. SGM8139 can be used
for motion detection and room monitors in a smart
home system as an ultra-low power wake-up block.
SGM8139 can be used to condition the vibration sensor,
providing a trigger signal to system.
SGM8139 is specifically designed to operate over a
wide range of supply voltage from 1.4V to 5.5V.
SGM8139 draws only 6μA supply current. It is ideal for
applications powered by single cell or dual cell alkaline
With two operational amplifiers, window comparators,
and delay/lockout timers adjustable through external
RCs, SGM8139 can both process the PIR output signal
effectively and provide good anti-interference performance.
The SGM8139 is specified for the -40℃ to +85℃
industrial temperature range. The SGM8139 is
available in Green SOIC-16 and TQFN-2.5×2.5-16L
packages. The TQFN package makes it ideal for
portable electronic products with area constrained PC
● Operating Voltage Range: 1.4V to 5.5V
● Average Quiescent Current: 6.5μA (TYP)
● Two Integrated High Input Impedance Operational
● Integrated Bi-directional Amplitude Discriminator
● Adjustable Delay/Lockout Timers With External
R and C
● Integrated Voltage Reference
● Available in Green SOIC-16 and TQFN-2.5×2.5-16L
SG Micro Corp
JANUARY 2018 - REV. A. 2