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RF96 Datasheet(PDF) 49 Page - HOPE Microelectronics CO., Ltd. |
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RF96 Datasheet(HTML) 49 Page - HOPE Microelectronics CO., Ltd. |
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49 / 121 page  Page 49 RF96/97/98 Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: sales@hoperf.com http://www.hoperf.com WIRELESS & SENSING PRELIMINARY DATASHEET 4.2.3.7. Image Rejection Mixer The RF96/97/98 employs an image rejection mixer (IRM) which, uncalibrated, 35 dB image rejection. A low phase noise PLL is used to perform calibration of the receiver chain. This increases the typical image rejection to 48 dB. 4.2.3.8. Image and RSSI Calibration An automatic calibration process is used to calibrate the phase and gain of both I and Q receive paths. This calibration allows enhanced image frequency rejection and improves the RSSI precision. This Calibration process is launched under the following circumstances: Automatically at Power On Reset or after a Manual Reset of the chip (refer to section 7.2). For applications where the temperature remains stable, or if the Image Rejection is not a major concern, this single calibration will suffice. Automatically when a pre-defined temperature change is observed. Upon User request, by setting bit ImageCalStart in RegImageCal, when the device is in Standby mode. Note that in LoRaTM mode the calibration command is inaccessible. To perform the calibration, the radio must be returned temporarily to FSK/OOK mode for the calibration process. A selectable temperature change, set with TempThreshold (5, 10, 15 or 20°C), is detected and reported in TempChange, if the temperature monitoring is turned On with TempMonitorOff=0. This interrupt flag can be used by the application to launch a new image calibration at a convenient time if AutoImageCalOn =0, or immediately when this temperature variation is detected, if AutoImageCalOn=1. The calibration process takes approximately 10ms. 4.2.3.9. Timeout Function The RF96/97/98 includes a Timeout function, which allows it to automatically shut-down the receiver after a receive sequence and therefore save energy. Timeout interrupt is generated TimeoutRxRssi x 16 x Tbit after switching to Rx mode if the Rssi flag does not raise within this time frame (RssiValue > RssiThreshold) Timeout interrupt is generated TimeoutRxPreamble x 16 x Tbit after switching to Rx mode if the PreambleDetect flag does not raise within this time frame Timeout interrupt is generated TimeoutSignalSync x 16 x Tbit after switching to Rx mode if the SyncAddress flag does not raise within this time frame This timeout interrupt can be used to warn the companion processor to shut down the receiver and return to a lower power mode. To become active, these timeouts must also be enabled by setting the correct RxTrigger parameters in RegRxConfig: Table 66 RxTrigger Settings to Enable Timeout Interrupts Receiver Triggering Event RxTrigger (2:0) Timeout on Rssi Timeout on Preamble Timeout on SyncAddress None 000 Off Off Active Rssi Interrupt 001 Active Off PreambleDetect 110 Off Active Rssi Interrupt & PreambleDetect 111 Active Active |
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