BQ34210-Q1 Datasheet, PDF (11/19 Pages) Texas Instruments – Automotive 1-Series Cell System-Side CEDV Fuel Gauge for Rarely Discharged Batteries

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bq34210-Q1
SLUSCG1 – AUGUST 2017
7.4 Device Functional Modes
To minimize power consumption, the fuel gauge has four power modes:
• INITIALIZATION
• NORMAL
• SLEEP
• SHUTDOWN
The fuel gauge passes automatically between these modes, depending upon the occurrence of specific events,
though a system processor can initiate some of these modes directly. The bq34210-Q1 Technical Reference
Manual (SLUUBE8) provides more details.
7.4.1 INITIALIZATION Mode
The bq34210-Q1 enters INITIALIZATION mode at power up. This mode prepares the device to enter NORMAL
mode through its internal power-on reset sequence. When the reset sequence is complete, the device
automatically moves to NORMAL mode.
7.4.2 NORMAL Mode
The bq34210 NORMAL mode is entered from INITIALIZATION mode when the power-on reset is complete.
When the charge and discharge currents are above the programmable level, the device will remain in NORMAL
mode. If the measured currents are below the programmable level, SLEEP mode is entered. Once the currents
increase above the threshold, the device will reenter NORMAL mode. The device will enter SHUTDOWN mode
through a command sequence.
7.4.3 SLEEP Mode
SLEEP mode is entered from NORMAL mode if enabled and the current is below a programmable level. Once
the current increases above that level, NORMAL mode is reentered.
7.4.4 SHUTDOWN Mode
The lowest power mode is SHUTDOWN mode. In this mode, the device is completely off. It is entered through an
I²C command. Exiting from SHUTDOWN mode can be done by battery removal and replacement or through the
ALERT pin. Pulling ALERT low for t_SHUP and then above V_IH(OD) enables the bq34210 device to go through its
standard power-up sequence (into INITIALIZATION mode).
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