SiP pin configuration

SiP pin configuration commands can be used to configure the behavior of selected pins of the nRF91 System in Package (SiP). The pins that can currently be configured are COEX0, MAGPIO[0:2], and MIPI RFFE.

For more information on the nRF9160 SiP pins, see Pin assignments in nRF9160 Product Specification.

The control of these pins is tied to the modem operations, i.e. the pins are only controllable when the modem is active. For example, if the modem goes to a long Power Saving Mode (PSM) sleep mode, the supply voltage for the pins is removed for power saving reasons and the pin state goes low until the modem wakes up again. The pin configuration can be made dependent on the modem’s RF frequency. This means that instead of using the cell’s static center frequency for decision-making, the dynamically changing center frequency of the current narrowband is used. Downlink or uplink direction does not affect the decision.

Note: The commands in this chapter are intended to be given only once at boot or, alternatively, e.g. in final device production where AT+CFUN=0 must be given to store the command contents to flash memory. After giving the commands, the modem software will automatically toggle the pins, depending on RF frequency and modem state. In other words, the application does not need to send these commands during modem active usage.
1 MIPI RFFESM, MIPI RF Front-End Control Interface (RFFE)