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TMS320C5515
SPRS645F – AUGUST 2010 – REVISED OCTOBER 2013
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5.4
External Clock Input From RTC_XI, CLKIN, and USB_MXI Pins
The device DSP includes two options to provide an external clock input to the system clock generator:
?
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Use the on-chip real-time clock (RTC) oscillator with an external 32.768-kHz crystal connected to the
RTC_XI and RTC_XO pins.
Use an external 11.2896-, 12.0-, or 12.288-MHz LVCMOS clock input fed into the CLKIN pin that
operates at the same voltage as the DV DDIO supply (1.8-, 2.5-, 2.75-, or 3.3-V).
The CLK_SEL pin determines which input is used as the clock source for the system clock generator. For
more details, see Section 3.5.1 , Device and Peripheral Configurations at Device Reset . The crystal for the
RTC oscillator is not required if CLKIN is used as the system reference clock; however, the RTC must still
be powered by an external power source. None of the on-chip LDOs can power CV DDRTC . The RTC
registers starting at I/O address 1900h will not be accessible without an RTC clock. This includes the RTC
Power Management Register which provides control to the on-chip LDOs and WAKEUP and
RTC_CLKOUT pins. Section 5.4.1 , Real-Time Clock (RTC) On-Chip Oscillator With External Crystal
provides more details on using the RTC on-chip oscillator with an external crystal. Section 5.4.2 , CLKIN
Pin With LVCMOS-Compatible Clock Input provides details on using an external LVCMOS-compatible
clock input fed into the CLKIN pin.
Additionally, the USB requires a reference clock generated using a dedicated on-chip oscillator with a 12-
MHz external crystal connected to the USB_MXI and USB_MXO pins. The USB reference clock is not
required if the USB peripheral is not being used. Section 5.4.3 , USB On-Chip Oscillator With External
Crystal provides details on using the USB on-chip oscillator with an external crystal.
5.4.1
Real-Time Clock (RTC) On-Chip Oscillator With External Crystal
The on-chip oscillator requires an external 32.768-kHz crystal connected across the RTC_XI and RTC_XO
pins, along with two load capacitors, as shown in Figure 5-4 . The external crystal load capacitors must be
connected only to the RTC oscillator ground pin (V SSRTC ). Do not connect to board ground (V SS ). Position
the V SS lead on the board between RTC_XI and RTC_XO as a shield to reduce direct capacitance
between RTC_XI and RTC_XO leads on the board. The CV DDRTC pin can be connected to the same
power supply as CV DD , or may be connected to a different supply that meets the recommended operating
conditions (see Section 4.2 , Recommended Operating Conditions ), if desired.
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 5-4. 32.768-kHz RTC Oscillator
76
Peripheral Information and Electrical Specifications
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