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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST72344K2 датащи(PDF) 210 Page - STMicroelectronics |
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ST72344K2 датащи(HTML) 210 Page - STMicroelectronics |
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210 / 247 page  Electrical characteristics ST72344xx, ST2345xx 210/247 Doc ID 12321 Rev 6 13.6.1 Crystal and ceramic resonator oscillators The ST7 internal clock can be supplied with four different Crystal/Ceramic resonator oscillators. All the information given in this paragraph is based on characterization results with specified typical external components. In the application, the resonator and the load capacitors have to be placed as close as possible to the oscillator pins in order to minimize output distortion and startup stabilization time. Refer to the crystal/ceramic resonator manufacturer for more details (frequency, package, accuracy, etc.). Table 97. Auto-wakeup from Halt oscillator (AWU) characteristics Symbol Parameter Conditions Min Typ Max Unit fAWU AWU oscillator frequency 50 125 250 kHz tRCSRT AWU oscillator startup time 50 µs Table 98. Crystal/ceramic resonator oscillator characteristics Symbol Parameter Conditions Min Max Unit fOSC Oscillator frequency (1) 1. The oscillator selection can be optimized in terms of supply current using an high quality resonator with small RS value. Refer to crystal/ceramic resonator manufacturer for more details. 116 MHz RF Feedback resistor (2) 2. Data based on characterisation results, not tested in production. The relatively low value of the RF resistor, offers a good protection against issues resulting from use in a humid environment, due to the induced leakage and the bias condition change. However, it is recommended to take this point into account if the µC is used in tough humidity conditions. 20 40 k Ω CL1 CL2 Recommended load capacitance versus equivalent serial resistance of the crystal or ceramic resonator (RS) (3) 3. For CL1 and CL2 it is recommended to use high-quality ceramic capacitors in the 5-pF to 25-pF range (typ.) designed for high-frequency applications and selected to match the requirements of the crystal or resonator. CL1 and CL2, are usually the same size. The crystal manufacturer typically specifies a load capacitance which is the series combination of CL1 and CL2. PCB and MCU pin capacitance must be included when sizing CL1 and CL2 (10 pF can be used as a rough estimate of the combined pin and board capacitance). See Table 99 below pF i2 OSC2 driving current fOSC= 2 MHz, C0 = 6 pF, CL1 = CL2 = 68 pF 426 µA fOSC= 4 MHz, C0 = 6 pF, CL1 = CL2 = 68 pF 425 fOSC= 8 MHz, C0 = 6 pF, CL1 = CL2 = 40 pF 456 fOSC= 16 MHz, C0 = 7 pF, CL1 = CL2 = 20 pF 660 |
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