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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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BCM4354 датащи(PDF) 31 Page - Cypress Semiconductor |
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BCM4354 датащи(HTML) 31 Page - Cypress Semiconductor |
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31 / 192 page  External 32.768 kHz Low-Power Oscillator BCM4354 Data Sheet BROADCOM CONFIDENTIAL Broadcom® October 15, 2014 • 4354-DS109-R Page 30 External 32.768 kHz Low-Power Oscillator The BCM4354 uses a secondary low-frequency clock for Low-Power mode timing. Either the internal low- precision LPO or an external 32.768 kHz precision oscillator is required. The internal LPO frequency range is approximately 33 kHz (± 30%) over process, voltage, and temperature, which is adequate for some applications. However, one trade-off caused by this wide LPO tolerance is a small current consumption increase during power save mode that is incurred by the need to wake up earlier to avoid missing beacons. Whenever possible, the preferred approach is to use a precision external 32.768 kHz clock which meets the requirements listed in Table 4. Table 4: External 32.768 kHz Sleep Clock Specifications Parameter LPO Clock Unit Nominal input frequency 32.768 kHz Frequency accuracy ±200 ppm Duty cycle 30–70 % Input signal amplitude 200-3300 mV, p-p Signal type Square-wave or sine-wave – Input impedancea a. When power is applied or switched off. >100k Ω <5 pF Clock jitter (during initial start-up) < 10,000 ppm |
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