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LP8764-Q1: What is the difference between standby and LP standby

Sherry Liang
Genius 10255 points
Part Number: LP8764-Q1

Dear team,

Could you please tell me what the different is between LP standby mode and standby mode? I can't get the answer form below description. The only difference is LDOVINT is disabled in LP standby mode while enabled in standby mode? It seems that VCCA monitoring is different between two mode. What is the difference?

In addition, in old version, we also have 9.1a and 9.1b which describes low power standby current consumption. Why we remove 9.1a and 9.1b in the latest datasheet?

Thanks & Best Regards,

Sherry

  • 0
    TI__Genius 10175 points

    Hi Sherry,

    LP_Standby mode is meant to minimize current consumption to a greater extent than Standby. This is done by disabling the Programmable FSM and only enabling certain internal regulators (LDOVINT remains enabled). In Standby mode, VCCA monitoring is not disabled and continues as in other modes, however LP_Standby disables this monitoring and requires voltage behavior as indicated in the paragraph you provided.

    In order to recover from LP_Standby (this also works for Standby), an On Request must be submitted which is described in the Datasheet as below. During recovery, registers are reset, EEPROM is read to static register values, and the device re-enters the PFSM via the INIT state. By comparison, in Standby, the device PFSM and static registers will persist and the device will simply behave as indicated in the 'Standby' state.

    Additionally, thermal monitoring is disabled when in LP_Standby

    I will look into the reason for 9.1a and 9.1b being absent from the datasheet.

    Thanks,

    Juan

  • 0 in reply to Juan Ospina
    TI__Genius 10255 points

    Hi Juan,

    Thanks for your reply!

    My customer uses TPS65941213-Q1 & LP876411B4-Q1 to power J721E. Now they need to compute the low power mode current. Currently they only give our VCCA=VIO=PVIN=3.3V. Could you please tell me what the status of our device is now, standby mode or LP standby mode?

    In addition, for standby mode, I noticed that VIO=0V, if VIO=3.3V, is it still standby mode? what is the current consumption?

    Thanks & Best Regards,

    Sherry

  • +1 in reply to Sherry Liang
    TI__Expert 5600 points

    Hi Sherry,

    When  TPS65941213-Q1 ENABLE is set low both TPS65941213-Q1 & LP876411B4-Q1 devices are in STANDBY mode and LP876411B4-Q1 current consumption is typically 34 µA. LP_STANDBY mode cannot be used (refer to errata https://www.ti.com/lit/er/slvz025/slvz025.pdf).

    VIO voltage is not affecting device STANDBY current so it can be either 0 V or 3.3 V. In a system level this VIO current is taken from somewhere so there is affects.

    J721E PMIC's User's guide https://www.ti.com/lit/pdf/slvucf3  describes more in details different operation states.

    BR, Jari

  • 0 in reply to Jari Niemela13
    TI__Genius 10255 points

    Hi Jari,

    Could you please help send me the latest PMIC checklist? My customer have 1.4 version, and they want to know whether we have update version.

    Thanks & Best Regards,

    Sherry

  • 0 in reply to Sherry Liang
    TI__Genius 10175 points

    Hi Sherry,

    1.4 is the latest version of the checklist.

    Best Regards,

    Juan Ospina