SM3320-RF-EV/NOPB National Semiconductor, SM3320-RF-EV/NOPB Datasheet

SM3320-RF-EV/NOPB

Manufacturer Part Number

SM3320-RF-EV/NOPB

Description

SOLARMAGIC RF EVAL KIT 2.4GHZ

Manufacturer

National Semiconductor

Series

SolarMagic™r

Type

Power Optimizer, Transceiverr

Datasheet

1.SM3320-RF-EVNOPB.pdf (8 pages)

Specifications of SM3320-RF-EV/NOPB

Frequency

2.4GHz

For Use With/related Products

SM3320-1A1, nRF24LE1

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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SM3320-RF-EV Reference

Design

Introduction

The SolarMagic™ SM3320-RF-EV reference design inte-

grates a power optimizer and a low-cost 2.4GHz radio to add

a remote shutdown feature to a PV system. The remote shut-

down feature can be used during installation, maintenance,

or emergency situations to de-energize the PV system.

Although its principal purpose is to communicate shutdown

intent, this RF system is 2-way and can be used for a wide

variety of communication applications, including monitoring,

security and identification.

The SolarMagic™ SM3320-RF-EV is based off of the

SM3320-1A1 power optimizer, and shares all of its best-in-

class power optimization features. This includes its ability to

mitigate real-world mismatch, its 99.5% peak efficiency, and

its Panel-Mode operation. In addition, the same ultra-low pro-

file form factor of the original SM3320-1A1 is maintained so

that it can be integrated into the same junction box designs.

This evaluation board should work as a power optimizer even

without a transmitter

The wireless RF communications in the SM3320-RF-EV is

implemented using a low-cost Nordic nRF24LE1 chip. This is

a low-cost, 2.4GHz radio and 8051 microcontroller on a single

chip. The 2.4GHz radio uses narrow band modulation (as op-

posed to direct sequence spread spectrum), which can be

used either with or without frequency hopping. Example soft-

ware is provided that implements the remote shutdown fea-

ture on the 8051 microcontroller in the nRF24LE1.

One of the unique features of the SM3320-RF-EV is its use

of the DC power lines as an RF antenna and transmission

FIGURE 1. System Overview Showing Intended Application of SM3320-RF-EV Board in a PV System

301438

National Semiconductor

Application Note 2122

Arief Hernadi

February 17, 2011

line. This enables the SM3320-RF-EV to maintain radio com-

munication even when it is mounted in the junction box of the

module. This antenna design can be used with other 2.4GHz

radio chipsets besides the nRF24LE1 by straightforward

modification of the provided design files.

The SM3320-RF-EV reference design provides a flexible plat-

form for developing value added features in firmware with no

additional hardware development. Examples of these fea-

tures include module-level monitoring, security (theft-detec-

tion and theft-deterrence), and identification. Similarly,

firmware development on this platform can be used to cus-

tomize the SM3320-RF-EV to be compatible with an existing

monitoring system or inverter communication protocol if a

customer desires.

SolarMagic™ technology is an overall solution that works in

existing and new installations, residential, commercial, and

utility scale projects. National Semiconductor’s 50 years of

experience in the electronics industry delivers unsurpassed

manufacturing, design, and development technology.

System Overview

Figure 1

implemented in its intended application. In this example, ev-

ery module is connected to an SM3320-RF-EV power opti-

mizer. Under normal conditions, the central transmitter sends

a signal to each SM3320-RF-EV power optimizer indicating

that it is ok to operate and output power. When an emergency

condition occurs, the central transmitter will send a signal

command to all the SM3320-RF-EV to shutdown. This de-

energizes the output of each SM3320-RF-EV, and in doing so

brings down the voltage of the DC bus and all DC wiring to a

safe voltage level.

depicts how the SM3320-RF-EV design would be

30143801

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SM3320-RF-EV/NOPB Summary of contents

Page 1

... One of the unique features of the SM3320-RF-EV is its use of the DC power lines antenna and transmission FIGURE 1. System Overview Showing Intended Application of SM3320-RF-EV Board System © 2011 National Semiconductor Corporation National Semiconductor Application Note 2122 ...

Page 2

... Operation at 250kbps is recommended. Receiver The nRF24LE1 IC will be located in the SM3320-RF-EV board and used as a receiver that controls the forced shutdown and Panel-Mode operation. By utilizing these two ICs (SM72442 and nRF24LE1),the ...

Page 3

... ICs. Please remove R101 and R102 from the board before downloading the .hex file into the receiver. The receiver IC in the SM3320- RF-EV board is pre-programmed with functions to enter a reset condition or to operate into a forced Panel-Mode con- dition ...

Page 4

... MOSFETs in the process of proper heatsinking. At elevated power operation please note the increase in temperature across these semiconductor devices. 8) TEST SETUP To perform an evaluation on a single SM3320-RF-EV suggested that the user connect the input to a SAS (Solar 30143809 Array Simulator) and the output to a load bank. ...

Page 5

... Test Results FIGURE 7. RF Shutdown When the electronic load is turned on at 1.5A load current, SM3320-RF-EV will operate in Panel Mode for at least 128 seconds. After this period, the MPPT mode is then entered. During MPPT, the output voltage is at 38V with an input volt- age of 30V ...

Page 6

Schematic www.national.com 30143806 6 ...

Page 7

7 30143807 www.national.com ...

Page 8

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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