TDA4VL...ALZQ1 datasheet(147/251 Pages) TI

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Device

OSC1_XO

OSC1_XI

J7ES_AUX_OSC_EXT_09

PCB Ground

Figure 7-32. 1.8-V LVCMOS-Compatible Clock Input

7.10.4.1.5 Auxiliary OSC1 Not Used

Figure 7-33 shows the recommended oscillator connections when OSC1 is not used. OSC1_XI must be

connected to VSS through an external pull resistor (Rpd) to ensure this input is held to a valid low level when

unused since the internal pull-down resistor is disabled by default.

Device

OSC1_XO

OSC1_XI

J7ES_AUX_OSC_NOT_USED_11

Rpd

PCB Ground

Figure 7-33. OSC1 Not Used

7.10.4.2 Output Clocks

The device provides several system clock outputs. Summary of these output clocks are as follows:

• MCU_CLKOUT0

– Reference clock output for Ethernet PHYs (50 MHz or 25 MHz)

• MCU_SYSCLKOUT0

– MCU_SYSCLK0 is divided by 4 and then sent out of the device as a LVCMOS clock signal

(MCU_SYSCLKOUT0). This signal can be used to test if the main chip clock is functioning or not. This

signal should not be used as a clock source for external devices on a board.

• MCU_OBSCLK0

– On the clock output MCU_OBSCLK0, oscillators and PLLs clocks can be observed for tests and debug.

This signal should not be used as a clock source for external devices on a board.

• SYSCLKOUT0

– SYSCLK0 is divided by 4 and then sent out of the device as a LVCMOS clock signal (SYSCLKOUT0).

This signal can be used to test if the main chip clock is functioning or not. This signal should not be used

as a clock source for external devices on a board.

• CLKOUT

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TDA4VE-Q1, TDA4AL-Q1, TDA4VL-Q1

SPRSP62 – DECEMBER 2022

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Product Folder Links: TDA4VE-Q1 TDA4AL-Q1 TDA4VL-Q1

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