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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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RFM95 Arkusz danych(PDF) 80 Page - HOPE Microelectronics CO., Ltd. |
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RFM95 Arkusz danych(HTML) 80 Page - HOPE Microelectronics CO., Ltd. |
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80 / 121 page  Page 80 RFM95/96/97/98(W) Tel: + 86-755-82973805 Fax: + 86-755-82973550 E-mail: sales@hoperf.com http:/ / www.hoperf.com WIRELESS & SENSING PRELIMINARY DATASHEET 5.4.4. Over Current Protection The power amplifiers of RFM95/96/97/98(W) are protected against current over supply in adverse RF load conditions by the over current protection block. This has the added benefit of protecting battery chemistries with limited peak current capability and minimising worst case PA consumption in battery life calculation. The current limiter value is controlled by the OcpTrim bits in RegOcp, and is calculated according to the following formulae: Table 81 Trimming of the OCP Current OcpTrim IMAX Imax Formula 0 to 15 45 to 120 mA 45 + 5*OcpTrim [mA] 16 to 27 130 to 240 mA -30 + 10*OcpTrim [mA] 27+ 240 mA 240 mA Note Imax sets a limit on the current drain of the Power Amplifier only, hence the maximum current drain of the RFM96/ 77/78 is equal to Imax + IFS. 5.5. Receiver Description 5.5.1. Overview The RFM95/96/97/98(W) features a digital receiver with the analog to digital conversion process being performed directly following the LNA-Mixers block. In addition to the LoRaTM modulation scheme the low-IF receiver is able to demodulate ASK, OOK, (G)FSK and (G)MSK modulation. All filtering, demodulation, gain control, synchronization and packet handling is performed digitally allowing a high degree of programmable flexibility. The receiver also has automatic gain calibration, this improves the precision of RSSI measurement and enhances image rejection. 5.5.2. Receiver Enabled and Receiver Active States In the receiver operating mode two states of functionality are defined. Upon initial transition to receiver operating mode the receiver is in the ‘receiver-enabled’ state. In this state the receiver awaits for either the user defined valid preamble or RSSI detection criterion to be fulfilled. Once met the receiver enters ‘receiver-active’ state. In this second state the received signal is processed by the packet engine and top level sequencer. For a complete description of the digital functions of the RFM95/96/97/98(W) receiver please see Section 4 of the datasheet. 5.5.3. Automatic Gain Control In FSK/OOK Mode The AGC feature allows receiver to handle a wide Rx input dynamic range from the sensitivity level up to maximum input level of 0dBm or more, whilst optimizing the system linearity. The following table shows typical NF and IIP3 performances for the RFM95/96/97/98(W) LNA gains available. |
Podobny numer części - RFM95 |
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Podobny opis - RFM95 |
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