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320 days
reduce this project description to two or three sentences, highlighting specs from the main chip datasheet. and function/purpose of the circuit.
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Introducing the Microphone Circuit project, which leverages the advanced SPH0645LM4H-B MEMS microphone that offers a 20 Hz to 10 kHz frequency range and precise sensitivity for superior audio capture. The circuit is designed with dedicated power and ground nets, along with optimized passive components, to ensure reliable performance for advanced audio processing and rapid prototyping applications.
320 days
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MK1
please explain what MK1 does.
@copilot please explain what MK1 does.
10mo
The component MK1 in your schematic is a MEMS microphone with the part number SPH0645LM4H-B manufactured by Knowles. Here's a summary of its key attributes and functions:
- Frequency Range: It can capture audio frequencies between 20 Hz and 10 kHz, making it suitable for voice and certain environmental sound applications.
- Sensitivity: The microphone has a sensitivity of $-26\text{dB} \pm 3\text{dB} @ 94\text{dB SPL}$, meaning it can detect quiet sounds with reasonably high precision.
- Supply Voltage: It operates within a voltage range of $1.62 \text{V}$ to $3.6 \text{V}$, with the rated voltage being $1.8 \text{V}$.
- Current Supply: It draws approximately $600 \mu\text{A}$ of current.
- Signal-to-Noise Ratio (SNR): It has a signal-to-noise ratio of $65 \text{dB}$, indicating the level of desired audio signal compared to the background noise.
- Directionality: It is omnidirectional, meaning it can pick up sound from all directions rather than being focused in one direction.
- Pins:
- WS (Word Select): This pin is used in I2S (Inter-IC Sound) interfaces for framing the data.
- SELECT: Used to assign the microphone a specific I2S data line, allowing multiple microphones to be used together without conflict.
- GND (Ground): Provides a reference point for power connections.
- BCLK (Bit Clock): Synchronizes the data transmission between the microphone and any connected devices.
- VDD (Voltage Drain Drain): This is the power input pin.
- DATA_OUT: Outputs the captured audio data.
In context, this microphone is likely being used for audio input in an electronic application, processing sound waves into electrical signals that can be further manipulated or analyzed.
10mo
what are the voltage properties for these pins?
10mo
For the MEMS microphone MK1, here are the voltage properties related to its pins:
-
VDD: The power input pin requires a supply voltage between 1.62 V and 3.6 V, with the typical supply voltage being around 1.8 V. This pin provides the necessary operating power for the microphone.
-
GND: The ground pin is the reference voltage level for the circuit. It is typically at 0 V.
The remaining pins—WS (Word Select), SELECT, BCLK (Bit Clock), and DATA_OUT—do not have specific voltage range requirements listed but are generally digital signals that operate at logic level compatible with the supply voltage (VDD).
These digital pins often operate with logic levels based on the supply voltage (VDD), meaning that a logic high would be close to VDD, and a logic low would be close to the GND level. Typically, they can be assumed to work within the same voltage range as VDD, to ensure compatibility with the rest of the digital circuitry they are interfacing with.
10mo
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2
MIC_WS
MIC_SDA
MICROPHONE CIRCUIT
MIC_SCL
R2
Resistance
50 Ω
MIC_WS
GND
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Inspect
Microphone Module
Controls
Properties
Designator Prefix
Module
Availability & Pricing
| Distributor | Qty 1 | |
|---|---|---|
| Arrow | $0.00–$0.19 | |
| Digi-Key | $1.50–$2.95 | |
| LCSC | $0.00 | |
| Mouser | $2.32 | |
| Verical | $0.00–$0.03 | |
Assets
- microphone_module.jpg
id=microphone_module
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hasofukirsch
copilot
MIC_SDAandMIC_WS. This could cause confusion in your schematic.3V3seems consistent with these specifications. Ensure your power source meets the microphone’s requirements.