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ST7232A 数据表(PDF) 121 Page - STMicroelectronics |
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ST7232A 数据表(HTML) 121 Page - STMicroelectronics |
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121 / 157 page  ST7232A 121/157 CLOCK AND TIMING CHARACTERISTICS (Cont’d) 12.5.3 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 are based on characterization results with specified typical external components. In the application, the reso- nator and the load capacitors have to be placed as close as possible to the oscillator pins in order to minimize output distortion and start-up stabiliza- tion time. Refer to the crystal/ceramic resonator manufacturer for more details (frequency, pack- age, accuracy...). Figure 64. Typical Application with a Crystal or Ceramic Resonator Notes: 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. 2. Data based on characterisation results, not tested in production. Symbol Parameter Conditions Min Max Unit fOSC Oscillator Frequency 1) LP: Low power oscillator MP: Medium power oscillator MS: Medium speed oscillator HS: High speed oscillator 1 >2 >4 >8 2 4 8 16 MHz RF Feedback resistor2) 20 40 k Ω CL1 CL2 Recommended load capacitance ver- sus equivalent serial resistance of the crystal or ceramic resonator (RS) RS=200Ω LP oscillator RS=200Ω MP oscillator RS=200Ω MS oscillator RS=100Ω HS oscillator 22 22 18 15 56 46 33 33 pF Symbol Parameter Conditions Typ Max Unit i2 OSC2 driving current 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 1 |
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