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PSoC™ 6 Forum Discussions

GrCa_1363456
Level 5
First comment on KBA First comment on blog 250 sign-ins
Level 5

Where can I find more detail for selecting a MHz XTAL for Bluetooth_LE  or  BLE ECO for PSoC 63?

Table 58 in the CY8C63x6, CY8C63x7 datasheet identifies two oscillators for the BLE ECO input of a PSoC 63: 16 MHz and 32 MHz.

The BLE ECO appears to be the connection to the XI/XO pins referred to in Figure  5 of the same document.

There’s a single note in AN218241, PSoC 6 MCU Hardware Design Considerations regarding the BLE ECO that states: "It should be noted that the ECO available as part of the BLE radio has its own pins (XI and XO). You can add the load capacitor, crystal accuracy, and startup time details in the AltHF clock configure window as shown in Figure 9. External load capacitors for the BLE ECO are not required."  Again here, it doesn't state any difference in the ECO frequency selected. Does the frequency of the crystal connected to the XI/XO pins matter as long as it matches the frequency identified in the brown box of Figure 9?

Greg

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Yugandhar
Moderator
Moderator 5 likes given First comment on blog 750 replies posted
Moderator

Hello,

PSoC 6 BLE devices supports both 16-MHz as well as 32-MHz crystals. You should use a crystal that meets the BLE specification because the offset in the crystal oscillator clock directly impacts the RF performance. Please refer to the PSoC/PRoC BLE Crystal Oscillator Selection and Tuning Techniques Datasheet for more information.

Please refer to "16-MHz BLE ECO for PSoC 6 BLE Demo Project – KBA223251" KBA for setting 16-MHz BLE ECO.

Thanks,
P Yugandhar.

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Yugandhar
Moderator
Moderator 5 likes given First comment on blog 750 replies posted
Moderator

Hello,

PSoC 6 BLE devices supports both 16-MHz as well as 32-MHz crystals. You should use a crystal that meets the BLE specification because the offset in the crystal oscillator clock directly impacts the RF performance. Please refer to the PSoC/PRoC BLE Crystal Oscillator Selection and Tuning Techniques Datasheet for more information.

Please refer to "16-MHz BLE ECO for PSoC 6 BLE Demo Project – KBA223251" KBA for setting 16-MHz BLE ECO.

Thanks,
P Yugandhar.