OL2385SWUG datasheet(6/64 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

6 / 64

commands coded in the second byte, which is called Command code. An action is taken

by OL2385 as per the designed meaning of such code.

Length (1 byte)

Information frame (I-frame)

Command (1 byte)

Payload (x bytes)

Length (1 byte)

Ack frame

Error code (1 byte)

aaa-027267

OL2385 state (1 byte)

Optional payload

(x bytes)

Figure 5. SPI frame types

The first byte of each frame type indicates the length of the frame to be received,

including itself. A length of 4 means 3 more bytes are going to follow after the first byte.

The payload field in both types of frames is optional. For details of each command, refer

to the SIGFOX SPI Command Interface Description.xls file at:

www.nxp.com/products/software-and-tools/hardware-development-tools/freedom-

development-boards/om2385-sf001-ol2385-wireless-sub-ghz-transceiver-sigfox-

development-kit-with-kl43z:OM2385-SF001?tab=Documentation_Tab

The data bytes between OL2385 and the host do not only just follow the format, they

also follow a particular sequence, depending on the state of the device, as shown in the

message sequence chart in Figure 6.

Data transfer protocol over SPI

Because the frequency of Sigfox messages is very low per day, the OL2385 device

generally remains in power-down SLEEP mode under normal conditions.

1. The device is always awakened by sending the Send wakeup (2 byte, fixed length)

frame from the host master.

2. On receiving such frame, an OL2385 device performs a wake-up reset and moves to

a ready state in 100 milliseconds.

3. The host should wait for the 100 ms wake-up to complete before sending the further

frames. No acknowledgment is sent from OL2385 after wake up.

4. Once the device wakes up, it is ready to receive command frames from the host.

5. An Information frame or I-frame is used to send a command to OL2385.

6. An Ack frame is used to send back a response, if required.

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