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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32F412RG датащи(PDF) 143 Page - STMicroelectronics |
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STM32F412RG датащи(HTML) 143 Page - STMicroelectronics |
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143 / 193 page  DocID028087 Rev 4 143/193 STM32F412xE/G Electrical characteristics 161 6.3.22 VBAT monitoring characteristics 6.3.23 Embedded reference voltage The parameters given in Table 80 are derived from tests performed under ambient temperature and VDD supply voltage conditions summarized in Table 15. Table 79. VBAT monitoring characteristics Symbol Parameter Min Typ Max Unit R Resistor bridge for VBAT -50- K Ω 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. Guaranteed by design, not tested in production. 2. Shortest sampling time can be determined in the application by multiple iterations. Table 80. Embedded 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. Shortest sampling time can be determined in the application by multiple iterations. 2. Guaranteed by design, not tested in production Table 81. 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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