This 32 kHz RC oscillator is specifically designed for the implemenation of accurate time-based features in always-on domains. With an overall precision better than 500 ppm on its full voltage and temperature operating ranges, Dolphin's IP meets the sleep clock accuracy requirements of the BLE standard, removing the need for an external crystal.
Depending on applicative use cases, the operating mode can be either programmed for high accuracy or low-power. A frequency monitoring is implemented: the digital output signal FOK informs the application when the frequency has reached the correct frequency value after leaving shutdown or standby modes. The IP also embeds configurable debugging features.
Key Benefits
- 2 active modes: High Accuracy (HA) / Open-Loop (OL)
- 2 inactive modes: Shutdown / Standby with quick wake-up time
- Frequency trimming
- 4-bit coarse tuning
- 6-bit fine tuning
- FOK signal
Key Features
| PARAMETERS | CONDITION |
Minimum value
|
Typical value
|
Maximum value
|
|---|---|---|---|---|
|
Input Voltage
|
- | 0.72 V | 0.99 V |
Applications
- Bluetooth
- Cellular IoT
- GNSS
- Hearing aids
- NB-IoT
- Smart Headset
- Smart Speaker
- TWS Earpods
- ULP MCU
Key Performances
- Nominal frequency: 32.768 kHz
- Single digital power supply: 0.72 V to 0.88 V
- Junction temperature range: -40°C to 125°C
- Timing precision < +/- 500 ppm @ 3σ
- over [1
- 10] sec
- Typical Current Consumptions @ 0.8 V:
- ? 430 nA in HA mode
- ? 420 nA in OL mode
- ? 25 nA in Shutdown mode
- 32.768 kHz +/- 0.5% frequency accuracy after trimming
- 50% +/- 10% Duty Cycle
Technical information
- Technology: TSMC 22 uLL
- Add-ons:
- -