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OL2385SWUG 데이터시트(PDF) 42 Page - NXP Semiconductors

부품명 OL2385SWUG
상세설명  SIGFOX software driver
PDF  64 Pages
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제조업체  NXP [NXP Semiconductors]
홈페이지  http://www.nxp.com
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OL2385SWUG 데이터시트(HTML) 42 Page - NXP Semiconductors

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NXP Semiconductors
OL2385SWUG
SIGFOX software driver
OL2385SWUG
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2018. All rights reserved.
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
1
–40
–5.7
–4.4
–9.7
–6.6
–7
2
–35
–1.4
–0.2
–5.2
–2.3
–2
3
–30
2.1
3.2
–1.4
1.3
1
4
–25
4.7
5.8
1.5
4.0
4
5
–20
6.5
7.6
3.7
5.9
6
6
–15
7.6
8.7
5.2
7.2
7
7
–10
8.2
9.3
6.2
7.9
8
8
–5
8.1
9.2
6.4
7.9
8
9
0
7.6
8.6
6.2
7.4
7
10
5
6.7
7.4
5.5
6.5
7
11
10
5.4
6.0
4.5
5.3
5
12
15
3.7
4.2
3.2
3.7
4
13
20
1.9
2.1
1.7
1.9
2
14
25
0.0
0.0
0.0
0.0
0
15
30
–2.3
–2.4
–1.8
–2.1
–2
16
35
–4.3
–4.6
–3.5
–4.1
–4
17
40
–6.4
–6.9
–5.1
–6.1
–6
18
45
–8.2
–8.9
–6.6
–7.9
–8
19
50
–9.9
–10.7
–8.0
–9.5
–9
20
55
–11.1
–12.2
–8.9
–10.7
–11
21
60
–12.1
–13.3
–9.5
–11.6
–12
22
65
–12.3
–13.8
–9.6
–11.9
–12
23
70
–11.9
–13.3
–8.8
–11.3
–11
24
75
–11.1
–12.5
–7.6
–10.4
–10
25
80
–9.3
–10.9
–5.5
–8.6
–9
26
85
–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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