Adeunis RF ARF26 Посібник користувача - Сторінка 9
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Друкувати сторінку• Transceiver turn-around:
This characteristic corresponds to the time required to switch from transmission to valid
receipt or vice-versa on the same device, and therefore to a TX_RX control input status
change.
RSSI
The 3-wire serial bus is bi-directional. It is therefore possible to read the status of certain
registers. The value of the RSSI (received signal strength indicator) is contained in the status
register in the form of a 6-bit word.
To know the value of these 6 bits, you have to go and read the status register according to the
following timing diagram:
- The first 4 bits (0101) correspond to the status register address.
th
- The 5
bit (1) selects register read mode.
T1: SDATA switching time from input to output on descending front of SCK: 50 ns max.
T2: data propagation delay time after a descending front: 50 ns max.
T3: SDATA switching time from output to input on rising front of SLE: 50 ns max.
The timings indicated in chapter 4.2 remain valid.
The value of the RSSI corresponds to bits D1 (LSB) to D6 (MSB). Bit D7 is of no interest.
The graph below gives a correspondence between the RSSI value and the received power
level.
05-11-V3-psn
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