OL2385SWUG datasheet(42/64 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

42 / 64

NDK crystal is shown in Table 9. A total of 26 signed integer values have to be sent in

order to cover the temperature range of –40 to +85 °C.

Table 9. Crystal Temp vs. Frequency deviation curve

Calibration

values

Temp

[Reference temp. at +25°C]

Crystal 1 Crystal 2 Crystal 3 Average

values

Rounded

values

–40

–5.7

–4.4

–9.7

–6.6

–7

–35

–1.4

–0.2

–5.2

–2.3

–2

–30

2.1

3.2

–1.4

1.3

–25

4.7

5.8

1.5

4.0

–20

6.5

7.6

3.7

5.9

–15

7.6

8.7

5.2

7.2

–10

8.2

9.3

6.2

7.9

–5

8.1

9.2

6.4

7.9

7.6

8.6

6.2

7.4

6.7

7.4

5.5

6.5

5.4

6.0

4.5

5.3

3.7

4.2

3.2

3.7

1.9

2.1

1.7

1.9

0.0

–2.3

–2.4

–1.8

–2.1

–2

–4.3

–4.6

–3.5

–4.1

–4

–6.4

–6.9

–5.1

–6.1

–6

–8.2

–8.9

–6.6

–7.9

–8

–9.9

–10.7

–8.0

–9.5

–9

–11.1

–12.2

–8.9

–10.7

–11

–12.1

–13.3

–9.5

–11.6

–12

–12.3

–13.8

–9.6

–11.9

–12

–11.9

–13.3

–8.8

–11.3

–11

–11.1

–12.5

–7.6

–10.4

–10

–9.3

–10.9

–5.5

–8.6

–9

–6.7

–8.3

–2.5

–5.9

–6

Such a curve is usually provided by the crystal manufacturer for a set of a few crystals

that differ in absolute values but show the same curve shape. One can build the mean

value over all samples for every temperature (column) and round it to get integer values.

These 26 rounded integer values have to be calculated only once for a specific crystal

type. The same values can be used for every board as long as the crystal type is the

same. For sending the values over SPI, start with the value at –40 °C and end with the

value at +85 °C. Use the hex notation of these signed integer values. The SPI command

number is 23 with a subcommand number as 1. If you would like to read the already

stored values on OL2385, use the SPI command number 23 with 0 as the subcommand

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