TLSR8359F512ET32 Frequency Error calibration

Topic

FAQ

shu121

Mar 07, 2019 14:44

中 /A

Dear FAE，
We are using Telink 8359 ESL solution. I'm doing the EMI test, in which I find that the frequency error is not normal.
I think I forget to ~~[b]~~calibrate the internal load capacitors[/b] . Since The x-tal I used is 24MHz_12pF_20ppm_3.2*2.5*1.1(Max)mm, with no external capacitors applied to it. And I tried different external capacitors, like below:
原始无电容
频段频偏
2402 262.5
2440 262
2480 262.4

12pF电容
频段频偏
2402
2440
2480 -331

4.7pF电容
频段频偏
2402
2440
2480 -276

1pF电容
频段频偏
2402
2440
2480 261.5

2.2pF电容
频段频偏
2402
2440
2480 248
It's very weird before I found in "page.4. ~~[i]~~AN_17011600-E2_Telink 8267 EMI Test Guide.pdf[/i]", that there are internal load capacitance values which need to be calculated by a "Telink jig".
So how can I get a "Telink jig"? My only Telink tool is a Telink Buring EVK.
Thanks and Best Regards!
_______________
Sherman
Xie Xiaobo
18200719591
SKYLAB
Simplify your design!

2 replies

shu121 [Author] Mar 07, 2019 16:30

中 _/A

~~[img]~~https://share.weiyun.com/5fh83Yk[/img]
Is this Telink jig？
How to use it to calibrate XO?

TL_Porter Mar 08, 2019 10:56

中 _/A

Hi,
There is two ways to solve this question. One way is use telink jig like you said , and this need a JIG hardware and a tool which you should get from telink.I think you can connect your telink sales for this . I advise another way to solve this question. You can use "tedebug" in the Telink buning Evk ， you can write in the anonlog 81 from 0xc0 to 0xdf to modify the cap in the ic.The default value is 0xd0. Like the picture below: ~~[attachment=0]~~4f7dd57b79d1072b38776cba2c1864a.png[/attachment]