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KRX2 датащи(PDF) 5 Page - Radiometrix Ltd |
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KRX2 датащи(HTML) 5 Page - Radiometrix Ltd |
5 / 9 page Radiometrix Ltd KRX2 page 5 Function S0 =1 Message repeated.... 75ms: end of message 120ms: function activated Start of new message S0 Output RXD Received Signal Strength Indication (RSSI) The KRX2 module incorporates a wide range RSSI that measures the strength of an incoming signal over a range of approximately 60dB. This allows assessment of link quality and available margin and is useful when performing range tests. Please note that the actual RSSI voltage at any given RF input level varies somewhat between units. The RSSI facility is intended as a relative indicator only - it is not designed to be, or suitable as, an accurate and repeatable measure of absolute signal level or transmitter-receiver distance. The output on pin 5 of the module has a standing DC bias in the region of 0.5V with no signal, rising to around 1V at maximum indication. The RSSI output source impedance is high (~100k Ω) and external loading should therefore be kept to a minimum. To ensure a fast response the RSSI has limited internal decoupling of 1nF to ground. This may result in a small amount of ripple on the DC output at pin 5 of the module. If this is a problem further decoupling may be added at the expense of response speed, in the form of a capacitor from pin 5 to ground. For example, adding 10nF here will increase RSSI response time from 100µs to around 1ms. The value of this capacitor may be increased without limit. Figure 4: Timing diagram – showing action upon receiving a message with S0 = 1 Figure 5: Typical RSSI response 200 300 400 500 600 700 800 900 1000 1100 -130 -120 -110 -100 -90 -80 -70 -60 -50 RF input level (dBm) |
Аналогичный номер детали - KRX2 |
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Аналогичное описание - KRX2 |
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