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TMS320VC5505 Scheda tecnica(PDF) 61 Page - Texas Instruments |
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TMS320VC5505 Scheda tecnica(HTML) 61 Page - Texas Instruments |
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61 / 135 page  RTC_XI RTC_XO C1 C2 Crystal 32.768kHz VSSRTC CVDDRTC 0.998-1.43V 1.05/1.3V CVDD VSS CLKIN RTC_XI RTC_XO CVDDRTC 0.998-1.43V 1.05/1.3V CVDD VSS CLKIN VSSRTC TMS320VC5505 www.ti.com SPRS503B – JUNE 2009 – REVISED JANUARY 2010 In this configuration the RTC oscillator can be optionally disabled by connecting RTC_XI to CVDDRTC and RTC_XO to ground (VSS). However, when the RTC oscillator is disabled the RTC registers starting at I/O address 1900h will not be accessible. This includes the RTC Power Management Register which provides control to the on-chip LDOs and WAKEUP and RTC_CLKOUT pins. Note: the RTC must still be powered even if the RTC oscillator is disabled. For more details on the RTC on-chip oscillator, see Section 6.4.1, Real-Time Clock (RTC) On-Chip Oscillator With External Crystal. Figure 6-4. LVCMOS-Compatible Clock Input With RTC Oscillator Enabled Figure 6-5. LVCMOS-Compatible Clock Input With RTC Oscillator Disabled 6.4.3 USB On-Chip Oscillator With External Crystal (Optional) When using the USB, the USB on-chip oscillator requires an external 12-MHz crystal connected across the USB_MXI and USB_MXO pins, along with two load capacitors, as shown in Figure 6-6. The external crystal load capacitors must be connected only to the USB oscillator ground pin (USB_VSSOSC). Do not connect to board ground (VSS). The USB_VDDOSC pin can be connected to the same power supply as USB_VDDA3P3. The USB on-chip oscillator can be permanently disabled, via tie-offs, if the USB peripheral is not being used. To permanently disable the USB oscillator, connect the USB_MXI pin to ground (VSS) and leave the USB_MXO pin unconnected. The USB oscillator power pins (USB_VDDOSC and USB_VSSOSC) should also be connected to ground. Copyright © 2009–2010, Texas Instruments Incorporated Peripheral Information and Electrical Specifications 61 Submit Documentation Feedback Product Folder Link(s): TMS320VC5505 |
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