AN4440 Datasheet, PDF (14/36 Pages) STMicroelectronics – RFFE HVDAC control

RFFE normal modes
AN4440
DAC B corresponds to register 1, 13.2 V -> 88d = 01011000b
Figure 12. RFFE frame for 13.2 V on DAC B
66&
6&/.
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86,'
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Third step: trigger bits
Set trigger bits (in register 28): only one register to update for this operation then all DACs
will be updated simultaneously.
Figure 13. Set trigger bits register
66&
6&/.
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86,'
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Continue with trigger mode
To update DACs with other values, still with trigger mode, repeat : Second step: program
several DACs and : Third step: trigger bits.
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DocID025913 Rev 1