AM652X datasheet(141/299 Pages) TI1

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CL=

C C

(C +C )

SPRS932_CLOCK_03

Device

WKUP_OSC0_XO

WKUP_OSC0_XI

Crystal

(Optional)

SPRSP08_PCB_CLK_OSC_2

Rbias

(Optional)

PCB Ground

141

AM6548, AM6528, AM6546

AM6526, AM6527

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SPRSP08E – NOVEMBER 2017 – REVISED OCTOBER 2018

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Specifications

For more information about Input clock interfaces, see section Clocking in chapter Device Configuration of

the device TRM.

5.11.4.1.1 WKUP_OSC0 Internal Oscillator Clock Source

Figure 5-10 shows the recommended crystal circuit. It is recommended that preproduction printed-circuit

board (PCB) designs include the two optional resistors Rbias and Rd in case they are required for proper

oscillator operation when combined with production crystal circuit components. In most cases, Rbias is not

required and Rd is a 0-Ω resistor. These resistors may be removed from production PCB designs after

evaluating oscillator performance with production crystal circuit components installed on preproduction

PCBs.

Figure 5-10. WKUP_OSC0 Crystal Implementation

NOTE

The load capacitors, Cf1 and Cf2 in Figure 5-11, should be chosen such that the below

equation is satisfied. CL in the equation is the load specified by the crystal manufacturer. All

discrete components used to implement the oscillator circuit should be placed as close as

possible to the associated oscillator WKUP_OSC0_XI, WKUP_OSC0_XO, and VSS pins.

Figure 5-11. Load Capacitance Equation

The crystal must be in the fundamental mode of operation and parallel resonant. Table 5-16 summarizes

the required electrical constraints.

Table 5-16. WKUP_OSC0 Crystal Electrical Characteristics

NAME

DESCRIPTION

MIN

TYP

MAX

UNIT

Parallel resonance crystal frequency

19.2, 20, 24, 25, 26, 27

MHz

Cf1

Cf1 load capacitance for crystal parallel resonance with Cf1 = Cf2

Cf2

Cf2 load capacitance for crystal parallel resonance with Cf1 = Cf2

AM652X Datasheet(PDF) 141 Page - Texas Instruments

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