Vesper VM1010 EVK PCB User manual

Vesper Technologies 1 Vesper VM1010 Eval PCB User Guide
1General Description
This document describes the S-VM1010-C Evaluation Kit PCB. The Eval PCB provides the
necessary circuitry to carry out evaluation of the VM1010 ZeroPower ListeningTM (ZPL)
microphone. The board consists of the VM1010 ZPL bottom port MEMS microphone, a
configurable threshold resistor circuit, current sense chip and a 0.1uF power supply
bypass capacitor along with an edge connector. The user can simply use a corresponding
female connector (CW Industries CWR-170-10-0000) or solder wires to make good
electrical contact to the power, mode and output pins of the mic and the current sense
pin of the circuit.
2Pinout and Pin Descriptions
The board is shown in Figure 1 as follows and the corresponding pins in table 1 have
been labeled:
Figure 1. VM1010 Eval PCB
VM1010 EVK PCB
User Guide
Rev 0. Oct. 2018
By Michael Tuttle
©

Vesper Technologies 2 Vesper VM1010 Eval PCB User Guide
Top Side
Bottom Side
Board
Pin
Number
Name
Description
Board
Pin
Number
Name
Description
T1
Dout
Digital output
for ZPL Trigger
B1
GND
Ground
T2
GND
Ground
B2
Mode
Mode Control
T3
Vcurrentsense
Current Monitor
voltage
B3
GND
Ground
T4
GND
Ground
B4
VDD
Power Supply (1.7 to
3.6V)
T5
Vout
Analog Output
B5
GND
Ground
Table 1. Pin descriptions
Figure 2. Edge-connector: CW Industries CWR-170-10-0000 and corresponding pin
assignments
3ZeroPower Listening Threshold Adjust
The eval board has a resistor circuit to configure the Rg which in turn varies the
ZeroPower Listening threshold. The solder jumper options S1 and S2 set the Rg value to
the corresponding pre-set threshold levels as shown in table 2 below.

Vesper Technologies 3 Vesper VM1010 Eval PCB User Guide
Table 2. Threshold Adjustment Settings Figure 3. Rg feedback resistor circuitry
4Schematic
The schematic of the board is shown in Figure 3. The S-VM1010-C Eval PCB consists of
the VM1010 microphone a configurable threshold resistor circuit, current sense chip
and a 0.1uF power supply bypass capacitor along with an edge connector. There are
solder jumper options for Rg Gain Adjust Circuit (S1, S2) and for Current Sense circuit
enable (SCS).
Figure 3. C-VM1000 Coupon PCB Schematic

Vesper Technologies 4 Vesper VM1010 Eval PCB User Guide
4 Other Information
The detailed specifications and description of the VM1010 microphone can be found in
the product datasheet and application note. For convenience the basic parameters and
absolute maximum ratings also shown in tables 3 and 4 below:
Parameter
Typical Value
Units
Supply Voltage
1.8
V
Idd ZPL Mode (Mode=high)
10
μA
Idd Normal Mode (Mode=low)
83
μA
Sensitivity @ 94dB SPL
-38.0
dBV
12.59
mVrms
Output Impedance
1000
Ω
Output DC Offset
0.8
V
Table 3. Typical parameters for microphone operation
Parameter
Rating
Units
Supply Voltage
-0.3 to +3.6
V
Sound Pressure Level
160
dB re 20 μPa
Operating Temperature Range
-40 to +85
°C
Storage Temperature Range
-55 to +150
°C
Mechanical Shock
10,000g per IEC 60028-2-27:2008
Vibration
Per MIL-STD 883E, 2007.2
Table 4. Absolute Maximum Ratings