BQ27510_08 Datasheet, PDF (27/36 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge With Direct Battery Connection

bq27510
www.ti.com.......................................................................................................................................................... SLUS816A – MARCH 2008 – REVISED JUNE 2008
POWER CONTROL
Reset Functions
When the bq27510 detects a software reset ([RESET] bit of Control( ) initiated), it determines the type of reset
and increments the corresponding counter. This information is accessible by issuing the command Control( )
function with the RESET_DATA subcommand.
As shown in Figure 3 if a partial reset was detected, a RAM checksum is generated and compared against the
previously stored checksum. If the checksum values do not match, the RAM is reinitialized (a Full Reset). The
stored checksum is updated every time RAM is altered.
DEVICE RESET
Generate Active
RAM checksum
value
Stored
checksum
NORMAL
OPERATION
NO
Do the Checksum
Values Match?
YES
Active RAM
NO
changed ?
Store
checksum
YES
Generate new
checksum value
Re-initialize all
RAM
Figure 3. Partial Reset Flow Diagram
Wake-Up Comparator
The wake up comparator is used to indicate a change in cell current while the bq27510 is in either SLEEP or
HIBERNATE modes. Operation Configuration uses bits [RSNS1–RSNS0] to set the sense resistor selection.
Operation Configuration also uses the [IWAKE] bit to select one of two possible voltage threshold ranges for
the given sense resistor selection. An internal interrupt is generated when the threshold is breached in either
charge or discharge directions. Setting both [RSNS1] and [RSNS0] to 0 disables this feature.
Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): bq27510
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