MCR20A: What are precise configurations of registers

[xueliu]

Hello,

I have got a Freedom Development Board for MCR20A Wireless Transceiver and I start to learn the source code and datasheet of this chip. But I found the description of certain registers in the reference manual (Rev. 3, July 2016) is not clear. e.g.,

1. PA_POWER (23h): In reference manual p.42 there is only a figure 3.9 to show the relation of PA_PWR step and TX_PWR. But the lower bound and higher bound of TX_PWR is not clear. According to the reference manual, "Programmable output power from –35 dBm to +8 dBm at the SMA connector, no trap". But -35 dBm is not shown in this figure. So I would like to know the precise corresponding TX_PWR to every valid value in register PA_POWER.

2. Indirect_Modem_CCA1_THRESH (22h) and Indirect_Modem_CCA2_THRESH (27h): There is 0~255 total 256 valid values in this register. Does it mean they support threshold from -255dBm to 0dBm ?

Thank you

Xue Liu

[jc_pacheco · Accepted solution]

Hello Xue,

PA_PWR (23h): Control PA Power Control. Input PWR_STEP range: [8 - 28] (-30 to ~8dBm)

Some measurements made with a FRDM-K64 + MCR20A using the Connectivity Test:

Pwr Step	Board1	Board2
8	-27.29	-26.87
9	-25.75	-25.09
10	-23.92	-23.23
11	-21.91	-21.28
12	-19.72	-19.06
13	-17.76	-17.15
14	-15.92	-15.31
15	-14.00	-13.41
16	-11.98	-11.48
17	-10.13	-9.67
18	-8.27	-7.80
19	-6.45	-5.45
20	-4.57	-4.16
21	-2.75	-2.34
22	-0.86	-0.53
23	0.86	1.18
24	2.67	2.84
25	4.28	4.45
26	5.74	5.88
27	7.00	7.09
28	7.94	8.02

-------------------

Indirect_Modem_CCA1_THRESH (22h): Programmable correlation peak threshold, for CCA1 mode (8-bit)

Indirect_Modem_CCA2_THRESH (27h): Programmable correlation peak threshold, for CCA2 mode (8-bit)

I strongly recommend you to take a look at the Kinetis MKW2xD and MCR20A Connectivity Software  for you to look at the defaults settings and software implementation.

Set Pwr Level: PhyPlmeSetPwrLevelRequest()

Set CCA Threshold: PhyPpSetCcaThreshold()

[xueliu]

Hello Juan Carlos Pacheco,

Thank you very much for your info and reply.

Recently I also found the "connectivity software" very useful and many default configs.

Regards,

Xue Liu