OL2385SWUG datasheet(45/64 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

45 / 64

You cannot fine tune it again and again by sending the values and expecting them to

accumulate. The value is always the absolute difference from the desired frequency. If

you see wrong results, it could be the entered value was wrong. That is why the value

has to be reset.

5. Connect the RF connector of the OL2385 device to a spectrum analyzer using an

SMA cable.

6. Choose the Continuous wave: Type

b, and then press Enter. The CW should be ON.

Write down the offset value from the spectrum analyzer as shown in the figure above.

7. Choose the Static_frequency_calibration: Type

22, and then press Enter. It will ask for

adding or subtracting the offset. Choose 1 or 2 according to the offset, and then press

Enter. It will ask for an offset value. Type the offset value without the sign, and then

press Enter. The sign was chosen by 1 or 2. Now the device is calibrated.

8. Choose the region Change to RCZXX: Type

15 or 16 or 17 or 18. Press Enter.

This will program the calibrated opening center frequencies of each region into the

OL2385.

9. Choose the Continuous wave: Type

b. Press Enter. The CW should be ON. Check if

the peak is on correct center frequency.

After the compensation, you can also use the SPI command sequence of test mode

14-0-9 with max hold setting on trace of spectrum analyzer. This sequence will send

nine frames on constant center frequency. Here you can also see the peak of the

spectrum has now adjusted on correct frequency.

Note:

This method is used to compensate the crystal on the center frequency of a respective

region. The device can be compensated on any other frequency using command

Set_UL_frequency – 9 first to change the uplink frequency. Then, use the Continuous

wave command to see the peak at this chosen frequency. The offset obtained from this

peak will correspond to the chosen frequency. One can then use this offset for calibration

in the above process. However, the proof of compensation cannot be checked by just

starting the CW again. It is not the continuous wave command that actually takes the

offset into calculation of frequency. The offset is taken into consideration by the SIGFOX

library. Changing a zone uses those SIGFOX library functions and so does the test

mode. Therefore, using Change to RCZXX or 14-0-9 will show the peak at compensated

frequency value. But, these two work only with center frequencies of the region. The

desired frequency is used to calculate the offset, then compensate it using the method

above, but catching the proof of compensation on desired frequency is not possible. One

can only see the proof on center frequencies of the region.

After running five commands, any command can be sent. For example, Send payload

can be used to send three SIGFOX frames on three different frequencies. Continuous

wave can be used for getting a constant unmodulated wave. After running above five

commands, one can now choose to send any command as required. For example,

Send payload can be used to send three SIGFOX frames on three different frequencies.

Continuous wave can be used for getting a constant unmodulated wave.

7.2.3 Miscellaneous commands

The following sections contain commands that are not mandatory, but useful in certain

conditions.

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