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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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STM32F427AI Scheda tecnica(PDF) 165 Page - STMicroelectronics |
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STM32F427AI Scheda tecnica(HTML) 165 Page - STMicroelectronics |
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165 / 240 page  DS9405 Rev 12 165/240 STM32F427xx STM32F429xx Electrical characteristics 197 6.3.23 VBAT monitoring characteristics 6.3.24 Reference voltage The parameters given in Table 84 are derived from tests performed under ambient temperature and VDD supply voltage conditions summarized in Table 17. Table 83. VBAT monitoring characteristics Symbol Parameter Min Typ Max Unit R Resistor bridge for VBAT -50- KΩ Q Ratio on VBAT measurement - 4 - - Er(1) Error on Q –1 - +1 % TS_vbat(2)(2) ADC sampling time when reading the VBAT 1 mV accuracy 5- - µs 1. Specified by design. 2. The shortest sampling time can be determined in the application by multiple iterations. Table 84. internal reference voltage Symbol Parameter Conditions Min Typ Max Unit VREFINT Internal reference voltage –40 °C < TA < +105 °C 1.18 1.21 1.24 V TS_vrefint(1) ADC sampling time when reading the internal reference voltage -10 - - µs VRERINT_s(2) Internal reference voltage spread over the temperature range VDD = 3V ± 10mV - 3 5 mV TCoeff(2) Temperature coefficient - - 30 50 ppm/°C tSTART(2) Startup time - - 6 10 µs 1. The shortest sampling time can be determined in the application by multiple iterations. 2. Specified by design, not tested in production Table 85. Internal reference voltage calibration values Symbol Parameter Memory address VREFIN_CAL Raw data acquired at temperature of 30 °C VDDA = 3.3 V 0x1FFF 7A2A - 0x1FFF 7A2B |
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