Data Sheet

LJ1269HC
Rev1.0 Page 21 Web: www.ljelect.com
3.3.7. High Power Settings
The LJ1269HC has a high power +20 dBm capability on PA_BOOST pin, with the following settings:
Table 11 High Power Settings
Register
Address
Value for High
Power
Value for Rx or
PA0 use
Description
RegOcp
0x13
0x0F
0x1x
OCP control
RegTestPa1
0x5A
0x5D
0x55
High power PA control
RegTestPa2
0x5C
0x7C
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 VSW R 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 LJ1269HC :
Figure 5. Output Power Curves
3.3.9 Over Current Protection
An over current protection block is built-in the module. 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 ×OcpTrim□ mA□
Note Imax sets a limit on the current drain of the Power Amplifier only, hence the maximum current drain of the
LJ1269HC is equal to Imax + IFS
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