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SX1231
WIRELESS & SENSING PRODUCTS
DATASHEET
Notes - To ensure correct operation at the highest power levels, please make sure to adjust the Over Current Protection
Limit accordingly in RegOcp.
- If PA_BOOST pin is not used (+13dBm applications and less), the pin can be left floating.
- With PA1 and PA2 enabled, 16dB of output power dynamic are available.
Pout vs. Programmed Power
18
14
10
6
2
-2
-6
Pout on PA0 [dBm]
-10
-14
-18
-22
Pout on PA1 [dBm]
Pout on PA1+PA2 [dBm]
-18
-14
-10
-6
-2
2
6
10
14
Program m ed Pow er [dBm ]
Figure 6. Output Power Curves
3.4.7. 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 × OcpTrim ( mA )
Note
Imax sets the maximum current drawn by the final PA stage, and does not account for the PA drivers and
frequency synthesizer. Global current drain on Vbat will be higher.
Rev. 7 - June 2013
Page 24
www.semtech.com
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