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BQ76952: Power modes of BQ76952

Shiv Prakash
Prodigy 130 points
Part Number: BQ76952

Hello TI Team!

Have a nice day! Hope all are well and safe,

We are using BQ76952 in our BMS design(14S2P, 330WH, o/p voltage- 48-57V, max charging current -7A,  max discurrent-20A). We have some question regarding BQ76952 power modes that need to clear during our designing,

Please provide answer of my queries as soon as possible

Power mode queries are mentioned below,

1. If there is no charging and discharging then How much time that device will be remain in normal mode before switching to sleep mode?
Can we configure this time period?

2.If there is no charging and discharging then How much time that device will be remain in normal mode before switching to deep sleep mode?
Can we configure this time period?

3.How much time that device will be remain in sleep mode after switching from normal mode?
Can we configure this time period?

4.How much time that device will be remain in deep sleep mode after switching from normal mode?

   Can we configure this time period?

5.How much time that device will be remain in deep sleep mode after switching from sleep mode?

6.Given condition to switch normal mode to sleep mode mention in datasheet is that
if CC1 current < Current threshold [Power: Sleep: Sleep Current] then we want to know that
(a)After how much time it will test this condition in normal mode periodically?
(b)What is the value of CC1 Current need to switch in sleep mode from normal mode?

7.Given Condition to switch sleep mode to normal mode mention in datasheet is that
if CC1 current > Current threshold[Power: Sleep: Sleep Current] then we want to know that
(a)After how much time it will test this condition in sleep mode periodically?
(b)What is the value of CC1 Current need to switch in normal mode from sleep mode?

8.What is CC1, CC2 and CC3 current value (in Normal mode, sleep mode and deep sleep mode) and How does CC1, CC2 and CC3 current value calculate by device in given
following conditions? 
(i) What is the value(CC1, CC2, CC3) in normal mode in if no charging and discharging, how does device calculate these values?
(ii) What is the value(CC1, CC2, CC3) in normal mode in if only charging, how does device calculate these values?
(iii)What is the value(CC1, CC2, CC3) in normal mode in if discharging, how does device calculate these values?
(iv) What is the value(CC1, CC2, CC3) in Sleep mode, how does device calculate these values?
(v) What is the value(CC1, CC2, CC3) in deep Sleep mode, how does device calculate these values?

(vi) can we any change in value of CC1, CC2 & CC3? if yes how?

9.Does CC2 & CC3 current value play in mode switching? if yes then how?


10.Does the device switch from sleep mode to deep sleep mode  only by DEEPSLEEP() subcommand? or there is any time period after
after which device switch to deep sleep mode from sleep mode?
Does DEEPSLEEP() subcommand given by controller to device? How does device power up if it is in deep sleep mode?

11.Does I2C communication is possible with the BQ76952, if it is in sleep mode/Deep sleep mode?

  • 0
    TI__Guru* 81034 points

    Hi Shiv,

    Most of the information needed to answer the questions on the power modes are covered in detail in Chapter 7 of the BQ76952 Technical Reference Manual: https://www.ti.com/lit/ug/sluuby2a/sluuby2a.pdf I suggest reading through the documentation.

    1. If there is no charging and discharging then How much time that device will be remain in normal mode before switching to sleep mode?
    Can we configure this time period? Yes, see the  Power:Sleep:Sleep Hysteresis Time register.

    2.If there is no charging and discharging then How much time that device will be remain in normal mode before switching to deep sleep mode?
    Can we configure this time period? The device only goes to DEEPSLEEP mode by sending a command.

    3.How much time that device will be remain in sleep mode after switching from normal mode?
    Can we configure this time period? Yes, see the  Power:Sleep:Voltage Time register.

    4.How much time that device will be remain in deep sleep mode after switching from normal mode?

       Can we configure this time period? See answer to Question 2.

    5.How much time that device will be remain in deep sleep mode after switching from sleep mode? See answer to Question 2.

    6.Given condition to switch normal mode to sleep mode mention in datasheet is that
    if CC1 current < Current threshold [Power: Sleep: Sleep Current] then we want to know that
    (a)After how much time it will test this condition in normal mode periodically?
    (b)What is the value of CC1 Current need to switch in sleep mode from normal mode?

    See Section 7.3 of the TRM.

    7.Given Condition to switch sleep mode to normal mode mention in datasheet is that
    if CC1 current > Current threshold[Power: Sleep: Sleep Current] then we want to know that
    (a)After how much time it will test this condition in sleep mode periodically?
    (b)What is the value of CC1 Current need to switch in normal mode from sleep mode?

    See Section 7.3 of the TRM.

    8.What is CC1, CC2 and CC3 current value (in Normal mode, sleep mode and deep sleep mode) and How does CC1, CC2 and CC3 current value calculate by device in given following conditions? 
    (i) What is the value(CC1, CC2, CC3) in normal mode in if no charging and discharging, how does device calculate these values?
    (ii) What is the value(CC1, CC2, CC3) in normal mode in if only charging, how does device calculate these values?
    (iii)What is the value(CC1, CC2, CC3) in normal mode in if discharging, how does device calculate these values?
    (iv) What is the value(CC1, CC2, CC3) in Sleep mode, how does device calculate these values?
    (v) What is the value(CC1, CC2, CC3) in deep Sleep mode, how does device calculate these values?

    There are no measurements in DEEPSLEEP mode. The measurements for CC1/CC2/CC3 are the same in Normal mode and Sleep mode, just the time period between measurements changes. See Section 4.3 of the TRM for details on CC1/CC2/CC3 measurements.

    (vi) can we any change in value of CC1, CC2 & CC3? if yes how? No

    9.Does CC2 & CC3 current value play in mode switching? if yes then how? No


    10.Does the device switch from sleep mode to deep sleep mode  only by DEEPSLEEP() subcommand? or there is any time period after
    after which device switch to deep sleep mode from sleep mode?
    Does DEEPSLEEP() subcommand given by controller to device? How does device power up if it is in deep sleep mode?

    The DEEPSLEEP() and EXIT_DEEPSLEEP() subcommands are used to enter and exit DEEPSLEEP. Section 7.4 of the TRM describes this mode in detail.

    11.Does I2C communication is possible with the BQ76952, if it is in sleep mode/Deep sleep mode? Yes, communication is possible in these modes.

    Best regards,

    Matt