OL2385SWUG datasheet(37/64 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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7.2 OL2385 Transceiver Initialization Sequence

After you have set up the KL43Z board according to Section 5.4.1 "Setting up KL43Z

board with terminal program", you are now ready to use the terminal to control the

OL2385 board. In order to do so, the following sections have to be understood.

Figure 26. SPI commands to control OL2385

7.2.1 Mandatory initialization sequence

The following sequence of commands is a

mandatory initialization sequence that must

be executed after power-on/reset of the OL2385 board.

7.2.1.1 Wakeup from low-power mode

A Send wakeup command has to be sent to the device first after any kind of software

device reset, power on/off reset or battery-on reset. By default, the device goes

immediately to low-power SLEEP mode after any of these resets or after the explicit SPI

command Send to sleep. The CS pin of the SPI interface is the wakeup pin and has to be

driven low by the MCU to wake the device up. This is done by a Send wakeup command,

including two bytes transfer as per SPI protocol. This has to be done only once after the

reset until the next reset. Once done until the next reset, other commands can be used.

Note: Before proceeding to the low-power mode, OL2385 configures all of its pins

to a pulled-down configuration, except for CS and ACK pins of SPI—these pins are

pulled high. For the low-power mode to work properly without any leakage current, it is

important to have the same settings of the pins on the MCU side. All pins on the MCU

should be pulled low and only CS and ACK should be high.

Note: The Send Wakeup command does not return an acknowledgment RX frame back.

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