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A 100pF decoupling capacitor is located on each control line. Logic level control lines on the PØ module select which of the two ports of the RF-switch is connected to the RF feed line. The RF section of the Photon is a finely tuned impedance controlled network of components that optimize the efficiency and sensitivity of the Wi-Fi communications.Īn RF feed line runs from the PØ module into a SPDT RF-switch. Please refer to AN-88 by Linear for a good discussion on this topic. Another technique is adding more capacitance to the input using an electrolytic capacitor. If long wires are unavoidable, it is advisable to add a 5.1V zener diode or similar transient suppression device from VIN to GND. To avoid these voltage spikes, keep input wiring as short as possible. At worst, a sudden inrush of current through the long wires can potentially cause a voltage spike at VIN large enough to damage the part. At best, this ringing can couple to the output and be mistaken as loop instability. When a ceramic capacitor is used at the input and the power is supplied by a wall adapter through long wires, a load step at the output can induce ringing at the input, VIN. Warning: When powering the Photon from long wires on USB and VIN, care should be taken to protect against damaging voltage transients. Likewise, the power source should be sufficient enough to source 1A of current to provide an adequate amount of current overhead (especially if powering additional circuitry off of VIN).
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If a high resistance cable (i.e., low current) is used, peak currents drawn from the Photon when transmitting and receiving will result in voltage sag at the input which may cause a system brown out or intermittent operation. When powering the Photon from the USB connector, make sure to use a quality cable to minimize IR drops (current x resistance = voltage) in the wiring. Deep sleep quiescent current is typically 80uA (Please refer to Recommended Operating Conditions for more info). Typical average current consumption is 80mA with 5V VIN with Wi-Fi on. (Please refer to Absolute Maximum Ratings for more info). 3V3 can also be used as an output, but has a limited overhead of only 100mA available. When used as an output, the max load on VIN is 1A.
FCC ID BY VIN NUMBER SERIES
When the Photon is powered via the USB port, VIN will output a voltage of approximately 4.8VDC due to a reverse polarity protection series schottky diode between V+ of USB and VIN. If power is supplied directly to the VIN pin, the voltage should be regulated between 3.6VDC and 5.5VDC. Power to the Photon is supplied via the on-board USB Micro B connector or directly via the VIN pin.
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To get you started quickly, Particle adds a rock solid 3.3VDC SMPS power supply, RF and user interface components to the PØ on a small single-sided PCB called the Photon. Particle combines a powerful ARM Cortex M3 micro-controller with a Broadcom Wi-Fi chip in a tiny thumbnail-sized module called the PØ (P-zero). Particle's Internet of Things hardware development kit, the Photon, provides everything you need to build a connected product. Particle.publish("my-event","The internet just got smarter!")