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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STA8089GAT датащи(PDF) 27 Page - STMicroelectronics |
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STA8089GAT датащи(HTML) 27 Page - STMicroelectronics |
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27 / 33 page  DS11777 Rev 4 27/33 STA8089GAT Electrical characteristics 32 Figure 3. 32.768 kHz crystal connection To drive the 32.768 kHz crystal pins from an external clock source: Disable the oscillator (bit28-OSCI_EN = 0b in PRCC_BACKUP_REG0 register). This disables the internal inverter, thus reducing the power consumption to minimum. Drive the RTC_XTI pin with a square signal or a sine wave. 4.8.3 OSCI oscillator specifications Default supported values are 16.368 MHz, 24 MHz, 26 MHz and 48 MHz. To enable USB peripheral the 48 MHz is mandatory 4.8.4 ADC specifications This section gives the AC specification of the 10 bit Successive Approximation Register ADC embedded in STA8089GAT device. It is controlled by the ARM9 MCU through a wrapper and an APB bridge as depicted in Figure 4 and it has a maximum conversion rate of 1MSPS with 8 muxed analog input channels capability. An internal voltage reference is used and analog/digital power supplies connections are implemented inside the device without any needs of dedicated external pins. Table 23. Characteristics of external slow clock input Symbol Parameter Min. Typ. Max. Unit TJIT (cc) Cycle-to-cycle jitter -70 — 70 ps TJIT (per) Period jitter -70 — 70 ps Variation -500 — 500 ppm TDUTY Duty cycle 45 — 55 % CL = 18 pF CL = 18 pF 32.768 kHz Crystal RTC_XTII RCT_XTO Device |
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