BQ27520-G4 Datasheet, PDF (13/34 Pages) Texas Instruments – System-Side Impedance Track Fuel Gauge

www.ti.com
bq27520-G4
SLUSB20B – NOVEMBER 2012 – REVISED DECEMBER 2015
Device Functional Modes (continued)
Because the gauge consumes the most power in NORMAL mode, the Impedance Track algorithm minimizes the
time the fuel gauge remains in this mode.
8.4.1.3 SLEEP Mode
SLEEP mode is entered automatically if the feature is enabled (Op Config [SLEEP] = 1) and AverageCurrent()
is below the programmable level Sleep Current. Once entry into SLEEP mode has been qualified, but prior to
entering it, the fuel gauge performs a coulomb counter autocalibration to minimize offset.
During SLEEP mode, the fuel gauge periodically takes data measurements and updates its data set. However, a
majority of its time is spent in an idle condition.
The fuel gauge exits SLEEP mode if any entry condition is broken, specifically when:
• AverageCurrent() rises above Sleep Current, or
• A current in excess of I_WAKE through R_SENSE is detected.
In the event that a battery is removed from the system while a charger is present (and powering the gauge),
Impedance Track updates are not necessary. Hence, the fuel gauge enters a state that checks for battery
insertion and does not continue executing the Impedance Track algorithm.
Copyright © 2012–2015, Texas Instruments Incorporated
Product Folder Links: bq27520-G4
Submit Documentation Feedback
13