WTK6900HD Baby Cry Detection Chip
120MHz AI Core · >95% Accuracy · BUSY Output · SOP16 · Ultra‑Low Power
The WTK6900HD is a dedicated baby cry detection chip designed for high‑performance, low‑cost infant care products. Powered by a 120MHz 32‑bit core with advanced DNN‑based algorithms, it reliably detects cries from 0–3 year old infants with >95% accuracy in a 65dB environment. The chip outputs a simple BUSY signal – a 300ms high‑level pulse upon cry detection – eliminating complex audio processing. With minimal external components (2 capacitors + 2 MIC parts) and ultra‑low power, it integrates seamlessly into smart cribs, soothing toys, nightlights, and monitoring systems.
- 120MHz CPU with neural accelerator
- >95% recognition rate (65dB environment)
- BUSY output – 300ms high pulse on cry
- Ultra‑simple external circuitry
- Wide voltage 2.4–5.2V
- Industrial grade –40°C to +85°C
Key Features
Technical Specifications
| Parameter | Value / Condition |
|---|---|
| CPU Frequency | 120 MHz |
| Recognition Accuracy | >95% (65dB environment, 0–3 years) |
| DAC | 16‑bit, SNR ≥ 95dB |
| ADC | 16‑bit, SNR ≥ 90dB |
| Supply Voltage | 2.4V – 5.2V |
| IO Level | 3.3V TTL |
| Microphone Input | Single analog MIC with built‑in bias |
| BUSY Output | 300ms high pulse on cry detection, low otherwise |
| Init Time | 100–300ms |
| External Components | 2 capacitors + 2 MIC components |
| Operating Temperature | –40°C ~ +85°C |
| Storage Temperature | –65°C ~ +150°C |
| Package | SOP16 (16‑pin) |
Pin Description – SOP16
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | CS | I/O | SPI Flash chip select |
| 2 | DO | I/O | SPI Flash data out |
| 3 | CLK | I/O | SPI Flash clock |
| 4 | CEDAT/D− | I/O | Programming data / USB D− |
| 5 | CECLK/D+ | I/O | Programming clock / USB D+ |
| 6 | RXD | I | UART receive (optional) |
| 7 | MIC | I | Microphone input |
| 8 | AGND | P | Analog ground |
| 9 | LED4/KEY13/DAC | I/O | GPIO / DAC output |
| 10 | VOUT | P | Microphone power (connect 106 cap to GND) |
| 11 | VCC | P | Power input (2.4–5.2V, connect 106 cap) |
| 12 | GND | P | Digital ground |
| 13 | PWM+ | O | Speaker positive (PWM output) |
| 14 | PWM− | O | Speaker negative |
| 15 | KEY14/LED5/BUSY | O | BUSY output – low idle, 300ms high on cry |
| 16 | TXD | O | UART transmit (optional) |
Pin 15 (BUSY) is the primary output. UART and SPI are optional and can be left unconnected for basic operation.
Workflow & Output
| Condition | BUSY (Pin 15) State |
|---|---|
| No cry detected (idle) | Low level (0V) |
| Cry detected (0–3 years) | 300ms high pulse (3.3V) then returns low |
The chip continuously monitors the microphone. Upon each cry detection, it generates a 300ms positive pulse. This signal can directly drive LEDs, triggers, or be fed to a microcontroller.
Application Scenarios
Example integrations:
- Smart crib: BUSY signal activates motor for rocking/vibration.
- Nightlight: BUSY turns on a soothing projection light.
- Comfort toy: BUSY triggers playback of lullabies.
- Hospital monitoring: BUSY lights up an indicator at the nurse station.
Why Choose WTK6900HD
FAQs
What does the WTK6900HD do?
It detects baby cries (0–3 years) and outputs a 300ms high pulse on pin 15 when a cry is recognized.
What is the recognition accuracy?
>95% in a 65dB environment.
Do I need a microcontroller?
No – you can directly use the BUSY signal to drive LEDs, buzzers, or relays.
What external components are required?
Just two capacitors (106 on VCC and VOUT) and two MIC components (with biasing).
Can it detect cries in noisy environments?
It has noise suppression, but accuracy decreases in high noise. It’s optimized for quiet rooms (e.g., nursery).
What is the output voltage level?
3.3V TTL – compatible with most logic circuits.
What is the power consumption?
Very low – suitable for battery devices. Detailed current consumption is available in the datasheet.
Note: The chip is factory‑configured with a default model. Customization (e.g., different sensitivity or output polarity) is available upon request. For volume orders, contact Waytronic for firmware adjustments. Refer to the full datasheet for PCB layout guidelines and decoupling recommendations.
