Overview
WTR096A-16S is a high-performance, high-quality voice chip with a maximum processing speed of 32 MHz. It features low cost, low power consumption, high reliability, and strong versatility. With superior audio quality, it can store up to 67 seconds of voice content (if audio quality is not a concern, it can store up to 135 seconds of voice content, calculated at a fixed sampling rate of 8K). A single chip can support recording from 22 to 90 seconds and supports external Flash memory. The chip includes an automatic gain control microphone input interface, supporting functions such as mixing, recording, or pitch-changing effects.
| Audio sampling rate | 8K | 12K | 16K |
| Total recording duration | 90s | 60s | 45s |
Functional Overview
- 1. Operating voltage: 2.0V to 5.5V; Reset voltage: 2.0V (customizable to 1.8V for special requirements);
- 2. 16-bit PWM/DAC output;
- 3. Supports 224-segment addressing;
- 4. Supports one-wire serial interface, two-wire serial interface, and button control;
- 5. The chip has an internal 132KB Flash for storing voice, and supports external 2 to 128MB Flash (configured via BIN files, external FLASH is used only for recording storage, fixed audio storage is in the internal FLASH, if modification to external is required, customization must be applied through the sales representative);
- 6. Both the main control program of the chip and the Flash data can be erased and rewritten;
- 7. Customers can select control methods, BUSY output status, and configure recording parameters via the host computer;
- 8. Customers can replace the voice content inside the chip using an MCU or a compatible downloader;
- 9. Features microphone input with automatic gain adjustment.
Voice Chip Pin Description
| Pad Name | Pad No. | ATTR. | Description describe |
| PB0 | 1 | I/O | Replace SPICLK/Program Download Port/Key3 Low Trigger Button |
| PB3 | 2 | I/O | Single-wire serial data input terminal / Dual-wire serial clock input terminal / Replace SPIDO / Key2 low trigger button |
| PB1 | 3 | I/O | Two-wire serial data input terminal / Replace SPIDI / Program download port / Key1 low trigger button |
| PC0 | 4 | I/O | Program download port (not to be connected to VCC and pull-up resistor) / Flash pin SPI_CLK |
| PWMN/DAC | 5 | OUT | PWM output pin/DAC output pin |
| PWMP | 6 | OUT | PWM output pin |
| GND | 7 | Power | Negative terminal of the power source |
| VDD | 8 | Power | Positive terminal of the power source |
| PC6 | 9 | I/O | Flash Pin SPI_MOSI SPI_MISO(3 wires) |
| PC7 | 10 | I/O | Flash Pin SPI_CS |
| PC5 | 11 | I/O | AGC gain adjustment |
| PC4 | 12 | I/O | The input for the MIC bias voltage. |
| PC3 | 13 | I/O | MIC input |
| PC2 | 14 | I/O | Busy signal output/replace CS |
| AGND | 15 | Power | Simulation |
| AVDD | 16 | Power | Simulated power supply |
Voice Chip application schematic diagram
Power supply and recording circuit
Note:
1. When wiring, capacitors C5 and C6 should be as close as possible to the VDD of the WTR096A chip, while capacitor C3 should be as close as possible to the AVDD of the WTR096A chip. The traces from the grounds of capacitors C3, C5, and C6 to the ground of the WTR096A chip should be kept as short as possible to enhance the anti-interference capability of the WTR096A chip;
2. Use R7 to separate the analog ground and digital ground;
3. R5 serves as the bias resistor for the MIC voltage during recording, ensuring that the bias is at half the supply voltage, and that the maximum dynamic range of the positive and negative halves of the output signal are equal. The resistance value of R5 can be adjusted appropriately to regulate sensitivity;
4. When powered by 3.3V, R6 should not be installed; when powered by 5V, R6 can be selected based on the operating voltage of the MIC. R6 mainly provides voltage division for the voltage supplied to the MIC from MIC_BIAS. Generally, it is not installed, but when installed, consideration must be given to R5 to ensure that their combined voltage division reaches an equilibrium point, achieving the best recording dynamic range;
5. C8 can be chosen between 10~47uF to stabilize the power supply during recording.
External Flash circuit (choose when external Flash is required)
Note: When installing an external FLASH, it is necessary to provide 3.3V power supply for the FLASH. It is recommended that the voice chip also uses a 3.3V power supply. If the voice chip requires a 5V power supply, then R2, R3, R4, and R8 need to be replaced with 300Ω resistors.
