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TPS65218: DCDC5/6 no output when power supply from Coin Cell input on CC(Pin25)

Genius 16770 points

Replies: 1

Views: 94

Part Number: TPS65218

Test with AM438x EPOS EVM.

#1. When power supply 5V to IN_BU(Pin 27) and CC(Pin25) separately with 5V, DCDC5, DCDC6 output voltage normally.

#2. remove power supply on IN-BU, keep power supply on CC, DCDC5, DCDC6 voltage drop to 0.

#3. According to TPS65218 datasheet, IN_NCC is a output pin, below post seems it is a input signal. even though, since I removed power on IN_BU, I think IN_nCC should be LOW already.

#4. Is this feature tested? Or my understanding to this feature is wrong?

Regards. Tony Tang
  • Tony,

    Please read section 5.6.2 Freshness Seal (FSEAL) Bit on page 50 of the TPS65218D0 datasheet, and refer to Figure 5-34. Modes of Operation Diagram on page 47.

    DCDC5/6 will only remain on if FSEAL == 1b.

    If you supply IN_BU and have a coin cell battery attached to CC pin, the default value of FSEAL is 0b, because it is a factory mode for saving coin cell battery power. To exit the factory mode (and break the "freshness seal"), you need to change FSEAL to 1b using the special I2C sequence provided in the datasheet.

    Thanks & Best Regards,

    Brian

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