OL2385SWUG datasheet(5/64 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

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Figure 3. SPI protocol: Host to OL2385 transfer

1. CS and Ack pins are high after data transfer from host to OL2385.

2. OL2385 drives Ack pin low to signal the host that OL2385 has data to transfer as

response.

3. Host drives CS pin low to signal host is ready to provide clock for such a transfer.

4. Host provides clock and data is written on SDO by OL2385.

Host reads the first byte of data. This is the length byte that describes how

many valid data bytes are to be followed on SDO, including itself. After receiving

all the bytes on MISO, the host waits for the Ack pin to be driven high and OL2385

drives the Ack pin high to signal that data is now completely sent.

6. Host drives CS back to high again to signal data reception is complete from OL2385

to host.

Figure 4. SPI protocol: OL2385 to host transfer

SPI commands

The bytes received or sent over the SPI interface must also follow a predefined format

and order as per the SPI protocol. The bytes sent from host to OL2385 are called as

command frames or information frames. The bytes sent from OL2385 to host are called

as Ack frames. The format follows a similar pattern for both of these types of frames,

as shown in Figure 5. The command frames contain a command from a set of allowed

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