AS6221 Digital Temperature Sensor
The AS6221 is a high-accuracy digital temperature sensor system designed for applications requiring precise temperature measurements, such as skin temperature monitoring. It features a Si bandgap temperature sensor, an ADC, and a digital signal processor, all integrated into a compact IC that communicates via a 2-wire digital bus. The sensor offers ultra-low power consumption, making it ideal for battery-powered devices. Key benefits include factory calibration, integrated linearization, and the ability to use up to eight AS6221 devices on a single bus through selectable IC addresses. An alert functionality is also included to signal excessive temperatures. Production testing is calibrated to NIST standards, with verification equipment accredited by an ISO/IEC-17025 laboratory.
Key Benefits & Features
- High Measurement Accuracy: 0.09 C (20 C to 42 C)
- Low Power Consumption: 6 A @ Operation (typical, @ 4 Hz), 0.1 A @ Standby (typical)
- Supply Voltage Range: 1.71 3.6 V (0 C to 125 C)
- Small PCB Footprint: 1.5 mm x 1 mm (WLCSP)
Applications
- Fitness/Health Wristbands
- Personal Computers
- Wearables
- HVAC
- Replacement of PTCs
- Electronic Equipment
- Tablets
- Convertibles
- Laptops
Technical Specifications
| Parameter | Symbol | Min | Typ | Max | Unit | Note |
| Analog System Parameters | ||||||
| Supply Voltage | VDD | 1.71 | 2.0 | 3.6 | V | T= 0C to 125C / T= -40C to 125C |
| Temperature Range | T | -40 | 125 | C | ||
| Standby Current Consumption | IDD | 0.1 | 0.4 | A | T= -40C to 65C / T= 65C to 125C | |
| Current Consumption (4 conversions /s) | IDD | 6 | 16 | A | T= -40C to 65C / T= 65C to 125C | |
| Resolution | N | 16 | Bits | |||
| Conversion Time | TS | 22 | 51 | ms | ||
| Conversion Rate | NS | 0.25 | 1 | 10.7 | Conv/s | CR[1:0]=00,01,10,11 |
| Temperature Accuracy Values | ||||||
| Temperature Error | T_ERR | -0.3 | 0.3 | C | 3 distribution, T= 20 C to 42 C | |
| Temperature Error | T_ERR | -0.25 | 0.25 | C | 3 distribution, T= -25 C to 55 C | |
| Temperature Error | T_ERR | -0.2 | 0.2 | C | 3 distribution, T= -40 C to 70 C | |
| Digital System Parameters | ||||||
| High level input voltage | V_IH | 0.7 * VDD | V | SCL, ADD0 | ||
| Low level input voltage | V_IL | 0.3 * VDD | V | SCL, ADD0 | ||
| Hysteresis voltage | V_HYST | 200 | 1200 | mV | SCL,ADD0, SDA,Alert | |
| Input leakage current | I_LEAK | -1 | 1 | A | SCL;ADD0, V_IL=0.0V | |
| Low level output voltage | V_OL | VSS+0.4 | V | Alert, I_OL=3mA | ||
| High level input voltage | V_IH | 0.7 * VDD | V | SDA | ||
| Low level input voltage | V_IL | 0.3*VDD | V | SDA | ||
| Low level output voltage | V_OL | VSS+0.4 | V | SDA | ||
| Tristate leakage current | I_OZ | -10 | 10 | A | SDA to VSS | |
2410311222_AMS-AS6221-AWLT-S_C3663150.pdf
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