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ST7LITE20F2 数据表(PDF) 129 Page - STMicroelectronics |
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ST7LITE20F2 数据表(HTML) 129 Page - STMicroelectronics |
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129 / 166 page  ST7LITE20F2 ST7LITE25F2 ST7LITE29F2 Electrical characteristics Doc ID 8349 Rev 5 129/166 13.5.1 Crystal and ceramic resonator oscillators The ST7 internal clock can be supplied with eight 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 resonator 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 stabilization time. Refer to the crystal/ceramic resonator manufacturer for more details (frequency, package, accuracy...). Table 72. Resonator performances Table 70. Auto Wakeup from Halt Oscillator (AWU) Symbol Parameter(1) 1. Guaranteed by design. Conditions Min Typ Max Unit fAWU AWU Oscillator Frequency − 50 125 250 kHz tRCSRT AWU Oscillator startup time −− − 50 µs Table 71. Resonator characteristics Symbol Parameter Conditions Min Typ Max Unit fCrOSC Crystal Oscillator Frequency(1) 1. When PLL is used, please refer to the Section 13.3.4: Internal RC oscillator and PLL and Section 7: Supply, reset and clock management (fCrOSC min. is 8 Mhz with PLL). − 2 − 16 MHz CL1 CL2 Recommended load capacitance versus equivalent serial resistance of the crystal or ceramic resonator (RS) − See Table 72: Resonator performances pF Supplier fCrOSC [MHz] Typical ceramic resonators(1) 1. Resonator characteristics given by the ceramic resonator manufacturer. For more information on these resonators, please consult www.murata.com CL1(2) [pF] 2. () means load capacitor built in resonator. CL2(2) [pF] Rd [ Ω] Supply voltage range [V] Temperature range [°C] Type (3) 3. SMD = -R0: Plastic tape package ( ∅=180mm). LEAD = -B0: Bulk Reference 2 SMD CSTCC2M00G56-R0 (47) (47) 0 2.4V to 5.5V -40 to 85 4 SMD CSTCR4M00G53-R0 (15) (15) 0 LEAD CSTLS4M00G53-B0 (15) (15) 0 8 SMD CSTCE8M00G52-R0 (10) (10) 0 LEAD CSTLS8M00G53-B0 (15) (15) 0 16 SMD CSTCE16M0V51-R0 (5) (5) 0 3.3V to 5.5V LEAD CSTLS16M0X53-B0 (15) (15) 0 4.5V to 5.5V LEAD CSALS16M0X55-B0 7 7 1.5k 3.8V to 5.5V |
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