Design with PCM1802 / MCU-1802 in Cirkit DesignerThe PCM1802 is a high-performance stereo analog-to-digital converter (ADC) designed for audio applications. It converts analog audio signals into digital data with high precision, making it ideal for use in audio recording, processing, and playback systems. The PCM1802 supports a wide range of sampling rates and provides excellent signal-to-noise ratio (SNR) and low distortion, ensuring high-quality audio conversion.
This circuit is a multi-sensor data acquisition system that uses a Nucleo WB55RG microcontroller to interface with a digital temperature sensor (TMP102), a pulse oximeter and heart-rate sensor (MAX30102), and a 0.96" OLED display via I2C. Additionally, it includes a Sim800l module for GSM communication, powered by a 3.7V LiPo battery.
Open Project in Cirkit Designer
This circuit features an Arduino Nano microcontroller interfaced with BMP180 and MPU-6050 sensors via I2C communication for environmental and motion sensing. It includes a piezo buzzer and three LEDs (red, yellow, blue) for audio-visual feedback, controlled by digital pins on the Arduino. A pushbutton with a pull-up resistor, a micro SD card module for data logging, and a 9V battery for power supply are also part of the circuit.
Open Project in Cirkit Designer
This circuit features an ESP32 microcontroller connected to various sensors and modules for data acquisition and communication. The BMP180 and MPU9250 sensors are interfaced via I2C for environmental and motion sensing, respectively. The AD8232 Heart Rate Monitor provides cardiac activity signals, while the GPS NEO 6M module allows for location tracking. Power management is handled by a 2S BMS connected to LiPo batteries, with voltage regulation provided by a Mini 360 Buck Converter. A toggle switch controls the power flow to the system.
Open Project in Cirkit Designer
This circuit features an ESP8266 NodeMCU microcontroller connected to a temperature sensor and an MPU6050 accelerometer/gyroscope module. The ESP8266 provides power (3.3V) and ground connections to both sensors and communicates with the temperature sensor via a digital I/O pin (D6) and with the MPU6050 via the I2C protocol using pins D1 (SCL) and D2 (SDA). The circuit is likely designed for environmental monitoring, capturing both temperature and motion data.
Open Project in Cirkit DesignerThe PCM1802 is a 24-bit stereo ADC with the following key specifications:
| Parameter | Value |
|---|---|
| Resolution | 24-bit |
| Sampling Rate | 16 kHz to 96 kHz |
| Signal-to-Noise Ratio (SNR) | 105 dB (typical) |
| Total Harmonic Distortion + Noise (THD+N) | 0.002% (typical) |
| Input Voltage Range | 0.6 Vrms to 2.1 Vrms |
| Power Supply Voltage | 5 V (analog), 3.3 V (digital) |
| Power Consumption | 85 mW (typical) |
| Operating Temperature Range | -25°C to 85°C |
The PCM1802 is typically available in a 20-pin SSOP package. Below is the pin configuration:
| Pin Number | Pin Name | Description |
|---|---|---|
| 1 | VINL | Left channel analog input |
| 2 | VINR | Right channel analog input |
| 3 | VREF1 | Reference voltage input |
| 4 | VREF2 | Reference voltage output |
| 5 | AGND | Analog ground |
| 6 | VCC | Analog power supply (5 V) |
| 7 | DGND | Digital ground |
| 8 | VDD | Digital power supply (3.3 V) |
| 9 | BCK | Bit clock input for I2S |
| 10 | LRCK | Left-right clock input for I2S |
| 11 | DATA | Serial audio data output |
| 12 | SCKI | System clock input |
| 13 | MODE0 | Mode selection pin 0 |
| 14 | MODE1 | Mode selection pin 1 |
| 15 | MODE2 | Mode selection pin 2 |
| 16 | PDWN | Power-down control (active low) |
| 17 | FMT0 | Audio data format selection pin 0 |
| 18 | FMT1 | Audio data format selection pin 1 |
| 19 | TEST | Test pin (leave unconnected in normal operation) |
| 20 | NC | No connection |
The PCM1802 can be interfaced with an Arduino UNO to capture audio data. Below is an example Arduino sketch to read I2S data from the PCM1802:
#include <I2S.h> // Include the I2S library for Arduino
void setup() {
// Initialize serial communication for debugging
Serial.begin(9600);
// Initialize I2S in slave mode to receive audio data
if (!I2S.begin(I2S_PHILIPS_MODE, 44100)) {
Serial.println("Failed to initialize I2S!");
while (1); // Halt if initialization fails
}
Serial.println("I2S initialized successfully.");
}
void loop() {
// Check if audio data is available
if (I2S.available()) {
int sample = I2S.read(); // Read a single audio sample
// Print the sample value to the serial monitor
Serial.println(sample);
}
}
Note: The Arduino UNO requires an external I2S interface module to communicate with the PCM1802, as it does not natively support I2S.
No Audio Output:
Distorted Audio:
I2S Communication Failure:
Q: Can the PCM1802 operate without an external clock source?
A: No, the PCM1802 requires an external system clock (SCKI) for operation. Ensure the clock frequency matches the desired sampling rate.
Q: What is the maximum sampling rate supported by the PCM1802?
A: The PCM1802 supports sampling rates up to 96 kHz.
Q: How do I select the audio data format?
A: Use the FMT0 and FMT1 pins to configure the desired audio data format (e.g., I2S, left-justified, right-justified).
Q: Can I use the PCM1802 with a 3.3 V analog power supply?
A: No, the analog power supply (VCC) must be 5 V. Only the digital power supply (VDD) operates at 3.3 V.