Preliminary
Low-Noise Bottom Port
Piezoelectric MEMS Microphone
with Wake on Sound Feature
Data Sheet
PMM-3738-VM1010-R
PUI Audio, with Vesper’s exclusive technology, presents the
PMM-3738-VM1010-R:
The world’s first ZeroPower Listening™ piezoelectric MEMS microphone designed
for ultra-low power always listening solution; delivering voice activation to battery-
powered devices.
Features:
•
ZeroPower Listening
™
technology
•
Full audio output on wake-up
•
Capable of voice detection with just 18 µW
operating power
•
Extends Battery life up to 10x
•
Dust and moisture resistant (IP test results
pending)
The
PMM-3738-VM1010-R
is a single-ended
analog MEMS microphone with
Wake on Sound.
The
Wake on Sound
mode allows for detection of
voice activity while consuming only 5 µA of supply
current (9 µW of power). In
Wake on Sound
mode,
a sound in the vocal band above the level threshold
instantly alerts a processor of an acoustic event.
The processor (DSP or Voice Processor) then
switches the
PMM-3738-VM1010-R
into
Normal
mode, with full audio output within 100
microseconds! Fast enough for the microphone to
capture the triggering sound and pass it along for
processing. This is the system architecture for
ZeroPower Listening™.
Wake on Sound
delivers voice activation to battery-
powered voice-interface consumer devices—while
drawing nearly zero power—such as smart
speakers, smart TV remote controls, smart
headphones, and IoT smart home products.
PUI Audio, Inc. A Projects Unlimited Company, 3541 Stop Eight Road, Dayton, OH 45414
Tel: (937) 415-5901 Fax: (937) 415-5925
Preliminary
Specifications
All specifications are at 25°C, VSupply = 1.8 V unless otherwise noted.
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
Normal Mode Acoustic Specifications
Sensitivity
Signal-to-Noise
Ratio
SNR
1 kHz, 94 dB SPL
94 dB SPL at 1 kHz signal,
20 Hz – 20 kHz, A-weighted
Noise
SNR
94 dB SPL at 1 kHz signal,
20 Hz – 8 kHz, A-weighted
THD
AOP
94 dB SPL
10.0% THD
-3db at 1 kHz
0.1
124
100
Omni
%
dB SPL
-41
-38
60
-35
dBV
dB(A)
Signal-to Noise
Ratio Voice Band
Total Harmonic
Distortion
Acoustic Overload
Point
Roll Off Frequency
Directivity
62
dB(A)
Hz
Wake on Sound Acoustic Specifications
(on material Date Code 1811 and higher)
Max Acoustic
Threshold
(default)
Mid Acoustic
Threshold
Min Acoustic
Threshold
PaTH
PaTH
PaTH
Rg = Open
Rg = 90 kOhm
Rg = 18 kOhm
89 dB
77 dB
65 dB
SPL
SPL
SPL
PUI Audio, Inc. A Projects Unlimited Company, 3541 Stop Eight Road, Dayton, OH 45414
Tel: (937) 415-5901 Fax: (937) 415-5925
Preliminary
Normal Mode Electrical Specifications
Supply Voltage
Supply Current
Power Supply
Rejection Ratio
Power Supply
Rejection
Output Impedance
Output DC Offset
PSRR
PSR
VDD
V
DD
≤ 1.8 V, Mode Normal
VDD = 1.8, 1kHz, 200mV
PP
Sine wave
VDD = 1.8, 217Hz, 100mV
PP
square wave, 20 Hz – 20kHz,
A-weighted
1.6
1.8
83
-56
-87
3.6
100
V
μA
dB
dB(A)
Z
OUT
1000
0.75
Ω
V
Wake on Sound Mode Electrical Specifications
Supply Voltage
Supply Current
VDD
V
DD
≤ 1.8 V, Mode WoS
1.6
7
1.8
10
3.6
14
V
μA
Digital Electrical Interface Specifications
Logic Input High
Logic Input Low
Logic Output High
Logic Output Low
Driving Capability
I
Load
= 2mA
I
Load
= 2mA
0.65*VDD
-0.3
0.7*VDD
VDD
0
0.3*VDD
100
3.6
0.35*VDD
V
V
V
V
pF
PUI Audio, Inc. A Projects Unlimited Company, 3541 Stop Eight Road, Dayton, OH 45414
Tel: (937) 415-5901 Fax: (937) 415-5925
Preliminary
Absolute Maximum Ratings
Parameter
Supply Voltage
Sound Pressure Level
Temperature Range
Storage Temperature Range
Maximum
3.6
160
-40 to +85
-50 to +150
Units
V
dB re 20 μPa
°C
°C
Frequency Response (Normal Mode)
Environmental Robustness
IP adherence is evaluated by 1 kHz Sensitivity spec post stress
Ingress Protection Type
Dust Resistance
Description
IP5X
Microphone Modes
mode
pin
high
low or
floating
Mic mode
Wake-on-Sound
Normal-Power
I
dd
, typ. (µA)
10
83
V
out
pin
GND
audio
output
d
out
pin
Low, then latches high
after first wake-up
event
Tied to GND through low
impedance
PUI Audio, Inc. A Projects Unlimited Company, 3541 Stop Eight Road, Dayton, OH 45414
Tel: (937) 415-5901 Fax: (937) 415-5925
Preliminary
Microphone
Operation
The
PMM-3738 -VM1010-R
is a user-controlled, multi-mode microphone.
Through the single
bit digital input pin
mode,
the user provides a signal that will put the microphone into
Wake on Sound
or
Normal
modes of operation. When in the
Wake on Sound
mode, should a sound be detected, the
microphone will output a digital high through the
dout
pin. The user can then switch the microphone to
Normal
mode by providing a digital low to the
mode
pin. The user would at some later point, provide a
digital high to the
mode
pin to return the microphone to
Wake on Sound
mode. Figure 2 shows the states
of various pins that are either user provided (mode,
Vdd)
or PMM-3738-VM1010-R provided (dout,
Vout)
at three points of operation.
Figure 2: Timing diagrams showing turn-on time (left), transition time
into
Wake on Sound
mode (center) &
Normal
mode (right)
It is recommend to power up the microphone in
Normal
mode (mode pin low), and then enter into
WoS
mode as needed.
Product Revision Technical Update
The PMM-3738-VM1010-R has been updated with a wider Wake on Sound range, on parts date
code 1811 and higher, giving designers more configurability in the acoustic threshold and
allowing for ZeroPower Listening to be used in more applications. Previously, this range was from
65 to 78 dB SPL. On parts date code 1811 and higher, this range has been extended from 65 dB to
89 dB SPL.
To accommodate this change, users simply need to change the Rg (GA1 to GA21 external resistor)
value. See the table below for the value of Rg to use to configure the turn-on threshold.
PUI Audio, Inc. A Projects Unlimited Company, 3541 Stop Eight Road, Dayton, OH 45414
Tel: (937) 415-5901 Fax: (937) 415-5925
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