RF69 Datasheet, PDF (22/81 Pages) List of Unclassifed Manufacturers – Low Power Integrated UHF Transceiver with On-Chip +20dBm PA

RF69
3.3.7. High Power Settings
The RF69 has a high power +20 dBm capability on PA_BOOST pin, with the following settings:
Table 11 High Power Settings
Register
RegOcp
RegTestPa1
RegTestPa2
Address
0x13
0x5A
0x5C
Value for
High Power
0x0F
0x5D
0x7C
Value for Rx
or PA0 use
Description
0x1x
OCP control
0x55
High power PA control
0x70
High power PA control
Note High Power settings MUST be turned off when using PA0, and in Receive mode
The Duty Cycle of transmission at +20dBm is limited to 1%, with a maximum VSWR of 3:1 at antenna port, over the
standard operating range [-40;+85°C].
3.3.8. Output Power Summary
The curves below summarize the possible PA options on the RF69:
22
18
14
10
6
2
-2
-6
-10
-14
-18
-22
-18
-14
-10
P out vs. P rogram med Pow er
Pout on PA0 [dBm ]
Pout on PA1 [dBm ]
Pout on PA1+ PA2 [dBm ]
P out on PA1+ PA2 with 20dB m s ettings [dBm ]
-6
-2
2
6
Pr o g r am m e d Po w e r [d Bm ]
10
14
18
Figure 6. Output Power Curves
3.3.9. Over Current Protection
An over current protection block is built-in the chip. It helps preventing surge currents required when the transmitter is used
at its highest power levels, thus protecting the battery that may power the application. The current clamping value is
controlled by OcpTrim bits in RegOcp, and is calculated with the following formula:
Imax = 45 + 5 


Note
Imax sets a limit on the current drain of the Power Amplifier only, hence the maximum current drain of the
RF69 is equal to Imax + I_FS
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