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SPIRIT1 Datasheet(PDF) 26 Page - STMicroelectronics |
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SPIRIT1 Datasheet(HTML) 26 Page - STMicroelectronics |
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26 / 94 page ![]() Characteristics SPIRIT1 26/94 Doc ID 022758 Rev 3 6.2.6 Sensors Characteristics measured over recommended operating conditions unless otherwise specified. All typical values are referred to TA = 25 °C, VBAT = 3.0 V. SETTIME PLL RX/TX settling time Settling time from RX to TX and from TX to RX 8.5 µs CALTIME PLL calibration time 54 µs Table 14. N-Fractional ΣΔ frequency synthesizer characteristics (continued) Symbol Parameter Test conditions Min. Typ. Max. Unit Table 15. Analog temperature sensor characteristics Symbol Parameter Test conditions Min. Typ. Max. Unit TERR Error in temperature Across all the temperature range - ±2.5 - °C TSLOPE Temperature coefficient 2.5 mV/ °C VTS-OUT Output voltage level 0.92 V TICC Current consumption Buffered output (low output impedance, about 400 Ohm) 600 µA Not buffered output (high output impedance, about 100 k Ω) 10 µA Table 16. Battery indicator and low battery detector(1) Symbol Parameter Test conditions Min. Typ. Max. Unit VBLT Battery level thresholds 2.1 2.7 V VBOT Brownout threshold Measured in slow battery variation (static) conditions (inaccurate) 1.535 V Measured in slow battery variation (static) conditions (accurate) 1.684 V BOThyst Brownout threshold hysteresis 70 mV 1. For battery powered equipment, the TX does not transmit at a wrong frequency under low battery voltage conditions. It either remains on channel or stops transmitting. The latter can of course be realized by using a lock detect and/or by switching off the PA under control of the battery monitor. For testing reasons this control is enabled/disabled by SPI. |
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