Stratus Pro nRF9151 Pin Diagram
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The header pins provide access to 28 versatile General-Purpose I/Os (GPIOs), with 8 configurable as ADC inputs (A0–A7). These GPIOs operate at 1.8V, sourced from the nRF9151 VDD_GPIO rail. For maximum flexibility, any GPIO can be assigned to digital peripherals, including SPI, UART, TWI, PDM, I2S, and PWM.
Stratus Pro nRF9151 Kit has two on-board push-buttons, one labeled as MODE, connected to the P0.31 of nRF9151 SiP, the other is labeled with RESET and is connected to the nRESET of the nRF9151.
The following table describes the function of the buttons:
MODE
P0.31
User-programmable push-button. Holding down MODE button while pressing and releasing RESET button puts the device into DFU mode.
RESET
nRESET
Resets the nRF9151 SiP.
Stratus Pro has one onboard user-programmable White LED labeled as LED. The LED is connected to P0.25 of nRF9151 SiP.
LED
P0.25
User-programmble LED. Asserting GPIO HIGH turns ON the LED while LOW turns it OFF.
Stratus Pro supports both nanoSIM and eSIM options. Out of the box, it includes a SIM socket compatible with a nano-sized SIM (4FF). Additionally, the board features an unpopulated eSIM (MFF2) footprint, allowing users to add a compatible eSIM IC if needed.
Only one SIM can be active at a time. By default, the device uses a nanoSIM. If an eSIM is soldered onto the board, the nanoSIM socket must remain unused.
The following table describes the PIN connections of the eSIM footprint:
1
GND
2
NC
3
SIM_DIO
4
NC
5
NC
6
SIM_CLK
7
SIM_RST
8
SIM_1V8
Connect the Stratus Pro kit to the debug out port on a 10-pin external debug probe, for example, nRF9160/nRF9161/nRF9151 DK, using a 10-pin JTAG/SWD cable.
Connect the external debug probe to the PC using a USB cable.
Ensure the Stratus Pro kit and the external debug probe are powered on.
This product shall only be connected to an external USB power supply rated at 5V DC.
This product shall only be connected to a LiPo battery rated at 2.8-5.5V with a battery capacity of > 300mAh.
This product should be placed on a stable, flat, non-conductive surface in use and should not be contacted by conductive items.
The connection of unapproved devices to the GPIOs may affect compliance or result in damage to the unit and invalidate the warranty.
To avoid malfunction or damage to the Stratus kit please observe the following:
Do not expose it to water, or moisture, or place it on a conductive surface whilst in operation.
Do not expose it to heat from any source; the Conexio Stratus is designed for reliable operation between temperatures -20℃ to 85℃.
Take care whilst handling to avoid mechanical or electrical damage to the printed circuit board and connectors.
Avoid handling the Stratus PCB while it is powered. Only handled by the edges to minimize the risk of electrostatic discharge damage.
The Conexio Stratus contains highly sensitive electronic circuitry and is an Electrostatic Sensitive Device (ESD). Handling a Conexio Stratus without proper ESD protection may destroy or damage it permanently. Proper ESD handling and packaging procedures must be applied throughout the processing, handling, and operation. ESD precautions should be implemented on the application board where the Conexio Stratus is mounted. Failure to observe these precautions can result in severe damage to the Conexio Stratus board!
Three connectors on the Stratus Pro nRF9151 will get damaged with improper usage. The JST connector on the circuit board, where you plug in the LiPo battery, is very durable but the connector on the battery itself is not. When unplugging the battery, take extra precautions to pull the connector using the wires, but instead hold the plug at its base to avoid putting stress on the wires. This can be tricky with bare hands - nose pliers are your friend here.
The USB-C connector on the Conexio Stratus Pro nRF9151 is soldered on the PCB with large surface pads as well as a couple of through-hole anchor points. Despite this reinforcement, it is very easy to rip out the connector if too much stress is put on in the vertical direction.
The U.FL antenna connectors are not designed to be constantly plugged and unplugged. The antenna pin is static sensitive and you can destroy the radio with improper handling. A tiny dab of glue (epoxy, rubber cement, liquid tape, or hot glue) on the connector can be used to securely hold the plug in place.
The Stratus Pro nRF9151 is specifically designed to require low insertion force when using a breadboard. This makes it easy to plug the Stratus in and out of the breadboard. Always remember to pinch-hold your precious Stratus by the sides (along with the header pins) when plugging-unplugging and not by the USB or the battery connector.
The Stratus dev kit can charge a LiPo battery using the USB port or the solar cell connected to the +PV pin. The onboard nPM1300 PMIC manages the power from the USB port while CN3165 manages the input power from the solar cell.
The Conexio Stratus Pro nRF9151 provides the user with the ability to monitor the battery voltage using the nPM1300 PMIC. Refer to the PMIC sample application on to how to enable this and read the respective battery and charging-related parameters.
Stratus Pro requires a PASSIVE external GPS/GNSS Antenna to work.
The GPS receiver on the Conexio Stratus dev kit is embedded into the modem of the nRF9151. To successfully get a GPS fix, and receive location data, a passive external GPS antenna must be connected to the u.fl connector labeled GPS on the board. A good reference is Molex LTE/GPS COMBO FLEXIBLE ANTENNA,
Mouser Electronics MPN: 538-213353-0100
Antenna Configurations in nRF SDK
Stratus Pro nRF9151 schematic is the same as that of Stratus Pro nRF9161 with the following changes:
nRF9151 SiP instead of nRF9161
CN3165 Solar charger instead of TI BQ25185.
.
For proper operation and to activate the GPS antenna, configure the following in your prj.conf file before building your application. Refer to on how to read GPS data.
Refer to the to see all the required configurations for the Stratus device.
