| Operating Voltage |
3.7V~5.5V (VCC) |
| Output Voltage |
3.3V |
| User-defined Button |
tested by IO16(DI) |
| RESET |
x1 |
| SD Card - Bus Interface |
SDIO Protocol |
| SD Card - Default Transmission Rate |
10MHz |
| SD Card - Max. Transmission Rate |
20MHz |
| Camera OV7725 |
(data as below is just for reference; some functions could not be realized by ESP32 now). |
| Camera OV7725 - Photosensitive/Light-sensitive Array |
640*480 |
| Camera OV7725 - Optical Size |
1/6" |
| Camera OV7725 - Angle of View |
25° |
| Camera OV7725 - Interface |
SCCB Standard Interface |
| Camera OV7725 - Output Pixel Format |
Raw RGB,RGB(RGB4:2:2 ,RGB565/555/444),YCbCr (4:2:2) |
| Camera OV7725 - Image Size |
VGA,QVGA and CIF to 40x30 |
| Camera OV7725 - Features |
VarioPixel Subsampling, Auto Image Control (AEC, AGC, AWB, auto band filter, ABL calibration), Image Quality Control (saturation, tone, gamma, clarity, anti-interference), ISP (noise reduction, defect calibration), Lens Shading Correction, Auto Saturation Adjustment, Frame Synchronization, Fixed-focus |
| NAU8822 - DAC |
94dB SNR , -84db THD |
| NAU8822 - ADC |
90dB SNR , -80dB THD |
| NAU8822 - Integrated BTL loudspeaker drive |
1W @ 8Ω |
| NAU8822 - Integrated earphone drive |
40mW @ 16Ω |
| NAU8822 - Integrated Features |
programmable microphone amplifier |
| NAU8822 - Typical Sampling Rate |
8KHz, 48KHz, 96KHz, 192KHz |
| NAU8822 - Standard Video Interface |
PCM and I2S |
| MIC - Type |
Electret Capacitor |
| MIC - Output |
analog |
| MIC - Direction |
omnidirectional |
| MIC - Frequency Range |
100Hz~15KHz |
| MIC - Sensitivity |
-43dB ±5dB @ 94dB SPL |
| MIC - Signal-to-noise Ratio |
58dB |