OL2385SWUG datasheet(39/64 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

39 / 64

Note: For any RCZ, there can be a difference between center frequency in the

specification and opening center frequency for the SIGFOX library due to the frequency-

hopping algorithm. For example, the actual TX frequency for RCZ4 is 920.8 MHz but

the value in the previous table is 902.2 MHz. This is because 902.2 MHz is the opening/

starting value of frequency in the frequency map. The frequency map is actually used to

enable all the possible frequencies on which the device can hop for transmitting frames.

The channels in this map are enabled using config word settings. See the SIGFOX_api.h

file for detailed information. So, for RCZ4 the map will start enabling the first frequency

starting from 920.8 MHz, which means that the frequency-hopping algorithm will

automatically take care of the correct frequency value. All this algorithm needs are the

initial opening values as input, from which it calculates the right frequency. Therefore, if

you will just use continuous wave after changing to RCZ4 region and check on spectrum

analyzer you will see only the 902.2MHz, since FH algorithm is not considered in CW.

However, when you will do a frame transmission using "Send payload" SPI command or

test mode sequence "14-0-9" to send 9 frames on constant frequency, the frequency of

transmission will be 920.8 MHz.

Additionally, the Change Zone commands allows the user to configure the following:

• Number of attenuation steps: 1 step is equal to 0.25 dBm of attenuation. The default

value is 0.

• Board oscillator type: 0 for standard crystal oscillator (XTAL) and 1 for temperature

calibrated crystal oscillator (TCXO).

Note: NXP currently only supports boards operating a TCXO and not a standard XTAL

oscillator.

• SIGFOX frame repetitions: As per SIGFOX library version 1.9.2a, which is included in

OL2385 firmware version 01.12.00.02.08.20.17, a value of 0 will set it to 1 frame. Any

value more than zero will set it to 3 repetitions. The default value is 3.

• Internal PA type: 0 for 14 dBm internal PA or 1 for 0 dBm internal PA. The default value

is 0 (14d Bm internal PA).

How to use the Change Zone command:

1. After wakeup from sleep, type

15 for RCZ1, 16 for RCZ2, 17 for RCZ3, or 18 for

RCZ4, and then press Enter.

2. Type the number of TX attenuation steps, such as 0, and then press Enter.

3. Type

0 if the board operates on a standard crystal oscillator (XTAL) or type 1 if the

board operates on a temperature calibrated crystal oscillator (TCXO), and then press

Enter.

4. Type the number of SIGFOX frame repetitions, such as 3, and then press Enter.

5. Type

0 for 14 dBm internal PA or type 1 for dBm internal PA (default value is 0), and

then press Enter.

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