S-VM1010-C

VM1010 Coupon PCB User Guide Rev 1.0 By Shin Nagpal General Description This document describes the S-VM1010-C Coupon PCB. The 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. Pinout and Pin Descriptions The board is shown in Figure 1 as follows and the corresponding pins in Table 1 have been labeled: Top Side Bottom Side Pin Name Description Pin Name Description T1 Dout Digital output for B1 GND Ground B2 Mode Mode Control B3 GND Ground B4 VDD Power Supply ZPL Trigger T2 GND Ground T3 Vcurrentsense Current Monitor voltage T4 GND Ground (1.7 to 3.6V) T5 Vout Analog Output B5 GND Ground Table 1: Pinout Configuration Vesper Technologies Inc. 77 Summer St, 8th floor Boston, MA - 02110 Rev 1.0 FEB2019 Vesper VM1010 Coupon PCB User Guide Figure 1. VM1010 Coupon PCB (Edge Connector recommendation is provided below) Edge Connector VM1010 Coupon PCB can be used with an Edge connector from CW Industries with part number CWR-170-10-0000. Supply range for Vdd is 1.6V – 3.6V 2 Vesper Technologies Inc. 77 Summer St, 8th floor Boston, MA - 02110 Rev1.0 FEB2019 Vesper VM1010 Coupon PCB User Guide Figure 2: Connections on VM1010 Coupon PCB and Edge Connector CWR-170-10-0000 ZeroPower Listening Threshold Adjust The Coupon 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. 3 Vesper Technologies Inc. 77 Summer St, 8th floor Boston, MA - 02110 Rev1.0 FEB2019 Vesper VM1010 Coupon PCB User Guide S1 S2 Rg GA1-GA2 WoS State state External Effective threshold Resistance Impedance (331kΩ||Rg) Open Open Open 331 kΩ 89 dBSPL Open Closed 100 kΩ 77 kΩ 75 dBSPL Closed Open 26 kΩ 24 kΩ 67 dBSPL Closed Closed 20 kΩ 19 kΩ 65 dBSPL Table 2. Threshold Adjustment Settings Figure 3. Rg feedback resistor circuitry 4 Vesper Technologies Inc. 77 Summer St, 8th floor Boston, MA - 02110 Rev1.0 FEB2019 Vesper VM1010 Coupon PCB User Guide Schematic 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 4: Schematic of S-VM1010-C Coupon PCB 5 Vesper Technologies Inc. 77 Summer St, 8th floor Boston, MA - 02110 Rev1.0 FEB2019 Vesper VM1010 Coupon PCB User Guide 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 83 μA -38.0 dBV 12.59 mVrms Output Impedance 1000 Ω Output DC Offset 0.8 V Idd Normal Mode (Mode=low) Sensitivity @ 94dB SPL Table 3: Typical parameters for microphone operation 6 Vesper Technologies Inc. 77 Summer St, 8th floor Boston, MA - 02110 Rev1.0 FEB2019 Vesper VM1010 Coupon PCB User Guide 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 For additional information on Vesper’s latest roadmap of microphone products, contact info@vespermems.com. 7 Vesper Technologies Inc. 77 Summer St, 8th floor Boston, MA - 02110 Rev1.0 FEB2019