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TMS320C5515
SPRS645F – AUGUST 2010 – REVISED OCTOBER 2013
www.ti.com
CLKIN
RTC_XI
RTC_XO
V SSRTC
CV DDRTC
V SS
CV DD
Crystal
32.768 kHz
C1
C2
0.998-1.43 V
1.05/1.3 V
Figure 5-5. LVCMOS-Compatible Clock Input With RTC Oscillator Enabled
CLKIN
RTC_XI
CV DDRTC
RTC_XO
V SS
V SSRTC
CV DD
0.998-1.43 V
Figure 5-6. LVCMOS-Compatible Clock Input With RTC Oscillator Disabled
1.05/1.3 V
5.4.3
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 5-7 . The external
crystal load capacitors must be connected only to the USB oscillator ground pin (USB_V SSOSC ). Do not
connect to board ground (V SS ). The USB_V DDOSC pin can be connected to the same power supply as
USB_V DDA3P3 .
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 (V SS ) and leave the
USB_MXO pin unconnected. The USB oscillator power pins (USB_V DDOSC and USB_V SSOSC ) should also
be connected to ground, as shown in Figure 5-8 .
When using an external 12-MHz oscillator, the external oscillator clock signal should be connected to the
USB_MXI pin and the amplitude of the oscillator clock signal must meet the V IH requirement (see
Section 4.2 , Recommended Operating Conditions ). The USB_MXO is left unconnected and the
USB_V SSOSC signal is connected to board ground (V SS ).
78
Peripheral Information and Electrical Specifications
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