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Ae 591 configure correctly the sw1 and sw3 pmic output rails #43

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Merged
merged 7 commits into from
Sep 2, 2025
Merged

Ae 591 configure correctly the sw1 and sw3 pmic output rails #43

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4b22633
AE-591: The SW1 (3.1V) and SW3 (3.3V) were not configured properly, a…
bogdanarduino Aug 26, 2025
a3d2615
AE-591: Added extensise comment explaining the need for the newly int…
bogdanarduino Aug 28, 2025
6d44754
Update app/power/power.cpp
bogdanarduino Sep 2, 2025
7249099
AE-591: Fixed comment error.
bogdanarduino Sep 2, 2025
e69c1ee
Merge branch 'AE-591_configure_correctly_the_SW1_and_SW3_PMIC_output_…
bogdanarduino Sep 2, 2025
8d6e143
Update app/power/power.cpp
bogdanarduino Sep 2, 2025
b5cada0
Update app/power/power.cpp
bogdanarduino Sep 2, 2025
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32 changes: 29 additions & 3 deletions app/power/power.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -75,16 +75,42 @@ static void portenta_power_init() {
data[0]=0x94;
data[1]=(20 << 3);
i2c.write(8 << 1, data, sizeof(data));

// At this point in the start-up sequence, the DC/DC converter output voltages of the PF1550, power management IC (PMIC),
// have been configured with the values found in the one-time programmable registers, themselves written prior to the PMIC, during production.
// On some commercial samples, these values were programmed incorrectly, and the PMIC outputs 3.0V instead of 3.1 or 3.3 on the respective rails.
// Therefore, it is first necessary to turn the SW1 and SW2 rails off, program the correct values in the SWx_VOLT registers,
// and then turn them back on using the SWx_VOLT_CTRL register for the changes to take full effect.

// SW1 turn off before config (SW1_VOLT_CTRL)
data[0]=0x35;
data[1]=0x0;
i2c.write(8 << 1, data, sizeof(data));

// SW2 to 3.3V (SW2_VOLT)
// SW2 turn off before config (turned on by OTP settings) (SW2_CTRL)
data[0]=0x3B;
data[1]=0xF;
data[1]=0x0;
i2c.write(8 << 1, data, sizeof(data));

// SW1 to 3.0V (SW1_VOLT)
// SW1 set to 3.0V (SW1_VOLT)
data[0]=0x32;
data[1]=0x6;
i2c.write(8 << 1, data, sizeof(data));

// SW2 set to 3.3V (SW2_VOLT)
data[0]=0x38;
data[1]=0x7;
i2c.write(8 << 1, data, sizeof(data));

// SW1 turn back ON (SW1_VOLT_CTRL)
data[0]=0x35;
data[1]=0xF;
i2c.write(8 << 1, data, sizeof(data));

// SW2 turn back ON (SW2_VOLT_CTRL)
data[0]=0x3B;
data[1]=0xF;
i2c.write(8 << 1, data, sizeof(data));
}
#endif

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