TDA4VL...ALZQ1 datasheet(139/251 Pages) TI

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7.10.4 Clock Specifications

7.10.4.1 Input and Output Clocks / Oscillators

Various external clock inputs/outputs are needed to drive the device. Summary of these input clock signals is as

follows:

• High frequency oscillators inputs

– OSC1_XO/OSC1_XI — external main crystal interface pins connected to internal oscillator which sources

reference clock. Provides reference clock to PLLs within MCU domain and MAIN domain. This high-

frequency oscillator is used to provide audio clock frequencies to MCASPs.

– WKUP_OSC0_XO/WKUP_OSC0_XI — external main crystal interface pins connected to internal

oscillator which sources reference clock. Provides reference clock to PLLs within WKUP and MAIN

domain.

• Low frequency digital input

– WKUP_LF_CLKIN - Low Frequency 32k digital clock input, optionally sourced from an external PMIC or

other clock source. This SoC does not support a LFOSC crystal input.

• General purpose clock inputs

– MCU_EXT_REFCLK0 - optional external System clock input (MCU domain).

– EXT_REFCLK1 — optional external System clock input (MAIN domain).

• Peripheral clocks - refer to the Signal Descriptions for peripheral specific clocks

•

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

device TRM.

7.10.4.1.1 WKUP_OSC0 Internal Oscillator Clock Source

Figure 7-23 shows the recommended crystal circuit. All discrete components used to implement the oscillator

circuit should be placed as close as possible to the WKUP_OSC0_XI and WKUP_OSC0_XO pins.

Device

WKUP_OSC0_XO

WKUP_OSC0_XI

Crystal

(Optional)

J7ES_WKUP_OSC_INT_02

Rbias

(Optional)

PCB Ground

Figure 7-23. WKUP_OSC0 Crystal Implementation

The crystal must be in the fundamental mode of operation and parallel resonant. Table 7-21 summarizes the

required electrical constraints.

Table 7-21. WKUP_OSC0 Crystal Electrical Characteristics

PARAMETER

MIN

TYP

MAX

UNIT

Fxtal

Crystal Parallel Resonance Frequency

19.2, 20, 24, 25, 26, 27

MHz

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SPRSP62 – DECEMBER 2022

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