OL2385SWUG datasheet(44/64 Pages) NXP

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NXP Semiconductors

OL2385SWUG

SIGFOX software driver

OL2385SWUG

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User guide

Rev. 2.1 — 6 April 2018

44 / 64

Figure 31. Offset calculation for static frequency calibration

The value of offset has to be calculated by using a continuous wave (SPI command

number b) with a spectrum analyzer. Another method is to use 9 continuous frames on

the same frequency (SPI command sequence 14-0-9) with a spectrum analyzer. There is

also a way of getting this offset value using the SIGFOX SFXIQ tool. This value of offset

is stored in nonvolatile memory of the OL2385. Therefore, the value does not need to be

set again on reset. This command has to be executed again only if the device is flashed

using a 2link box with new firmware.

Follow the following steps for static frequency calibration:

1. Press the reset button on the KL43Z to start from the beginning (optional).

2. Choose Send Wake up: Type

1, and then press Enter. (This step is optional and not

required if there is no device reset).

3. Choose the region Change to RCZXX: Type

15 or 16 or 17 or 18. Press Enter. This

will program the opening center frequencies of each region into the OL2385.

Example of switching to RCZ1:

Type

15, and then press Enter. Type 0 for zero attenuation steps for uplink TX power,

and then press Enter. Type 0 for 55.2 MHz crystal type, and then press Enter. Type

for SIGFOX repetition frames, and then press Enter. Type

0 for 14 dBm PA level, and

then press Enter.

4. Choose the Static_frequency_calibration: Type

22, and then press Enter. It will ask for

adding or subtracting the offset. Type

2, and then press Enter. It will ask for an offset

value. Type

0, and then press Enter. This will reset the offset first inside OL2385.

Note: The offset always has to be an absolute value from the desired frequency.

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