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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM8AF6213 датащи(PDF) 69 Page - STMicroelectronics |
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STM8AF6213 датащи(HTML) 69 Page - STMicroelectronics |
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69 / 112 page  DS9884 Rev 9 69/112 STM8AF6213/13A/23/23A/26 Electrical characteristics 108 HSE oscillator critical gm formula The crystal characteristics have to be checked with the following formula: gm gmcrit » where gmcrit can be calculated with the crystal parameters as follows: gmcrit 2 Π × HSE f × () 2 Rm × 2Co C + () 2 = Rm: Notional resistance (see crystal specification) Lm: Notional inductance (see crystal specification) Cm: Notional capacitance (see crystal specification) Co: Shunt capacitance (see crystal specification) CL1 = CL2 = C: Grounded external capacitance 10.3.4 Internal clock sources and timing characteristics Subject to general operating conditions for VDD and TA. High speed internal RC oscillator (HSI) Table 42. HSI oscillator characteristics Symbol Parameter Conditions Min Typ Max Unit fHSI Frequency - - 16 - MHz ACCHS HSI oscillator user trimming accuracy Trimmed by the application for any VDD and TA conditions 3-bit calibration -1(1) -1(1) % 4-bit calibration -0.5(1) -0.5(1) HSI oscillator accuracy (factory calibrated) 3.0 V ≤ VDD ≤ 5.5 V, -40 °C ≤ TA ≤ 150 °C -5 - 5 3.0 V ≤ VDD ≤ 5.5 V, -40 °C ≤ TA ≤ 125 °C -3(2) -3(2) tsu(HSI) HSI oscillator wakeup time - - - 2(3) µs IDD(HSI) HSI oscillator power consumption - - 170 250(3) µA 1. Selection between legacy 3-bit calibration and 4-bit extended calibration is done using the HSITRIM bit in OPT3 and NOPT3.To achieve a higher accuracy, 4-bit calibration must be enabled. 2. These values are guaranteed for STM8AF62xxIxx order codes only. 3. Guaranteed by characterization results. |
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