# Clock
source

Source: [https://docs.qualcomm.com/doc/80-WL740-8/topic/clock_source.html](https://docs.qualcomm.com/doc/80-WL740-8/topic/clock_source.html)

The QCC74x has two clock sources. The high-frequency crystal (typical value
      40 MHz) is the system clock source. This crystal must be placed when wireless communication is
      used in the application. The other crystal input source is a 32.768 KHz crystal, used for
      timing and low-power wake-up. Additionally, QCC74x internally integrates
      compensating load capacitors, so the external load capacitors are optional.

## System
clock source

Source: [https://docs.qualcomm.com/doc/80-WL740-8/topic/clock_source.html](https://docs.qualcomm.com/doc/80-WL740-8/topic/clock_source.html)

This crystal provides a stable clock for the system. This clock source can be used as an
      input source for multiple PLLs within QCC74x and can also serve as a clock
      input source for some external peripheral interfaces. The selectable frequencies for this
      crystal are 40 MHz, 32 MHz, 24 MHz, and 38.4 MHz. It is recommended that customers use
      40 MHz.

Table : Schematic for the system crystal

| QCC743 | ![](data:image/png;base64,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) |
| --- | --- |
| QCC744/QCC748 | ![](data:image/png;base64,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) |

Note: For QCC743, the R22 resistor is optional. Customer can directly
      ground pins 2 and 4.

The R22 = 0 R resistor added in the preceding schematic is to prevent interference from
      other signals around the crystal area in the actual PCB layout design. This interference can
      enter the crystal and degrade RF performance. Hence, a 0 R resistor is used to isolate the
      ground plane of the crystal.

The selection criteria for the system crystal are as
follows:

- Frequency stability is within ± 20 ppm.
- The load capacitance value is less than or equal to 15 pF. 12 pF is recommended.
- Drive power is less than 200 µW.
- Equivalent resistance is less than 100 Ω.

## RTC clock
source

Source: [https://docs.qualcomm.com/doc/80-WL740-8/topic/clock_source.html](https://docs.qualcomm.com/doc/80-WL740-8/topic/clock_source.html)

This crystal is used for precise timing in QCC74x and is used in
      low-power application scenarios to wake up QCC74x and handle application
      transactions. Although the QCC74x has an integrated RC32K crystal, there is
      still a certain error (1% ~ 3%) after calibration, which is insufficient for precise timing
      application scenarios.

Table : Schematic for the RTC crystal

| QCC743 | ![](data:image/png;base64,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) |
| --- | --- |
| QCC744/QCC748 | ![](data:image/png;base64,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) |

Two resistors have been added to the preceding schematic. The main purpose is to consider
      that when the RTC clock is not needed for precise timing in the actual application scenario,
      two GPIOs can be added by selecting a 0 R resistor.

Note: In addition, recommend reserving two load-matching capacitors for
      the in and out pins of XTAL32K. Although QCC74x has integrated matching
      capacitors, the equivalent capacitance value is 8 pF. If the crystal requires a load
      capacitance greater than 8 pF, external crystal load capacitors are needed. Crystals with a
      load capacitance of less than 8 pF are recommended.

Last Published: Apr 08, 2025

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