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ST72324BJ2 Datasheet(PDF) 146 Page - STMicroelectronics |
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ST72324BJ2 Datasheet(HTML) 146 Page - STMicroelectronics |
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146 / 188 page  Electrical characteristics ST72324B 146/188 32 Kbyte Flash and ROM devices Figure 67. Typical application with a crystal or ceramic resonator (32 Kbyte Flash and ROM devices) Table 95. Crystal and ceramic resonator oscillators (32 Kbyte Flash and ROM devices) Symbol Parameter Conditions Min Typ 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 characterization 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 microcontroller 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). fOSC = 1 to 2 MHz fOSC = 2 to 4 MHz fOSC = 4 to 8 MHz fOSC = 8 to 16 MHz 20 20 15 15 60 50 35 35 pF i2 OSC2 driving current VDD = 5V, VIN =VSS LP oscillator MP oscillator MS oscillator HS oscillator 80 160 310 610 150 250 460 910 µA OSC2 OSC1 fOSC CL1 CL2 i2 RF ST72XXX Resonator When resonator with integrated capacitors Power down logic Feedback loop Linear amplifier VDD/2 ref |
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