Max ESR for PSoC 4XX7_BLE models running at Max CPU Speed 24MHz

[ShLi_2270861]

Hi,

The PSoC 4XX7_BLE state that Max ESR allowed is 60 Ohm.

In my design I am using the lower spec models like CY8C4127LQI-BL473, which only runs at 24MHz, as opposed to the faster ones in the family that run at 48MHz.

But the spec (Document Number: 001-90479 Rev. *N) has one ESR number for both and it is the same number 60 Ohm.

I was wondering - In the context of cost reduction for my product - can I use a lower spec crystal with max 100 Ohm ESR for the CY8C4127LQI-BL473 ?

I am working in the Chinese consumer electronics market and the higher quality crystals are more expensive.

Please advise,

Shachar

[GyanC_36 · Accepted solution]

Hi Shachar,

      The BLESS sub-system hardware runs over a maximum of 24 MHz in all the PSOC 4 BLE family devices and the maximum ESR requirement for the 24-MHz crystal to be used with PSoC 4 BLE  devices is 60 Ω at 24-MHz. We do not recommend to use a max 100 Ohm ESR.

-Gyan