TDA4VM21 datasheet(203/331 Pages) TI

203 / 331 page

Device

OSC1_XO

OSC1_XI

J7ES_AUX_OSC_EXT_09

PCB Ground

Figure 6-32. 1.8-V LVCMOS-Compatible Clock Input

6.9.4.1.5 Auxiliary OSC1 Not Used

Figure 6-33 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 6-33. OSC1 Not Used

6.9.4.1.6 WKUP_LFOSC0 Internal Oscillator Clock Source

Figure 6-34 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.

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TDA4VM-Q1, TDA4VM

SPRSP36K – SEPTEMBER 2021 – REVISED APRIL 2024

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TDA4VM21 Datasheet(PDF) 203 Page - Texas Instruments