ST2100 datasheet(32/39 Pages) STMICROELECTRONICS

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Clocking parameters

ST2100

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DocID025777 Rev 1

6.2

Real-time clock (RTC)

The external circuit for generating the real-time clock from a crystal oscillator is shown in

Figure 5.

Figure 5. RTC crystal connection

1. CL1 and CL2 are the load capacitors.

The value of the capacitors depends on the type of the selected crystal. For example, using

a FOX Electronics®, P/N NC26LF-327 32.768 KHz oscillator, the value of the capacitors is

15 pF. The oscillator may not start if a crystal (FOX P/N FX325BS) is used.

If the shunt capacitance (Co) of the crystal is ~7.0 pF, then the maximum ESR of the crystal

must be less than 50

.

6.3

PCIe/SATA clock

For SATA operation, the PCIE_XTAL1/PCIE_XTAL2 clock inputs can be implemented by

a 30 MHz crystal oscillator as shown in Table 18.

For PCIe operation, a suitable clock driver such as IDT IDT_9FG104 can be used.

Table 18. EXPI clock characteristics

Symbol

Parameter

Min.

Typical

Max.

Unit

fOSC

PCIE_XTAL1/PCIE_XTAL2 clock input

frequency for SATA configuration

MHz

PCIE_XTAL1/PCIE_XTAL2 clock input

frequency for PCIe configuration

100

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