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Sleep Mode

Ship Mode (bq27010 only)

Hibernate Mode

Programming the EEPROM

bq27010, bq27210

SLUS707B – APRIL 2006 – REVISED JANUARY 2007

This low power mode is entered when the HDQ or CLK and/or DTA line is pulled low for at least 18 seconds and

the charge or discharge activity is below the DMF threshold. Normal gas gauging ceases, but battery

self-discharge, based on the temperature when the device entered sleep mode, is maintained internally. The

device wakes every 43.6 minutes to update the temperature measurement and goes back to sleep after about

18 seconds if the HDQ or CLK and/or DTA line is still low and the charge or discharge activity is still below the

DMF threshold. The bqJUNIOR has an internal 3

µA pulldown current on each communication line, eliminating

the need to add external pulldown resistors to force a logic 0 on open communication lines.

When the device wakes, it stays in active mode long enough to confirm that the charge or discharge activity is

still below the digital magnitude filter threshold. This is meant to minimize possible error if the battery pack is

removed from the end equipment for a short period of time and then reinserted, and there is not a transient on

the communication lines to pull the device into the active mode. This is an issue only if the system has some

current drain from the battery even though the communication lines are low. The gauge reenters sleep mode

when the charge or discharge activity falls below the digital magnitude filter threshold.

When all communication lines are pulled high, the device leaves the sleep mode. If the DMF threshold is set to

zero and a communication line is pulled low, the device does not enter sleep mode until the average current

value is less than 3.57 µV/Rsr.

If the battery pack can be removed and placed on an external charger, the charger should have a pull-up

resistor on the HDQ or SCL and SDA lines to wake the part from sleep. A 100 k

Ω pullup resistor from

This low power mode is to be used when the pack manufacturer has completed assembly and test of the pack.

The ship mode is enabled by setting the SHIP bit in the MODE register and issuing the control command (data

0xA9 to register 0x00). Ship mode is entered only when the ship mode is enabled and the HDQ or CLK and/or

DTA line has been pulled low for at least 18 seconds. This allows the pack manufacturer to enable the ship

mode and pull the pack from the test equipment without any additional overhead. Transients on a

communication line after the ship mode has been enabled but before the device has entered ship mode, do not

cause the device to stay in active mode. Transients on a communication line, after the device has entered ship

mode can wake the part from ship mode, but if there is no charge or discharge activity above the DMF

threshold, the part automatically enters the Sleep mode as previously described.

All device functionality stops in ship mode and it does not start again until the communication lines are pulled

part leaves ship mode. If the current NAC value must be retained after waking, ship mode should not be used.

exit the hibernate mode. If RBI voltage does not drop below 1.3 V, RAM content is maintained and allows

The bqJUNIOR has 10 bytes of EEPROM that are used for firmware control and application data (see the

bqJUNIOR Register Descriptions section for more information). Programming the EEPROM should take place

during pack manufacturing because a 21 V pulse is needed on the PROG pin. The programming mode must be

enabled prior to writing any values to the EEPROM locations. The programming mode is enabled by writing to

the EE_EN register (address 0x6E) with data 0xDD. Once the programming mode is enabled, the desired data

can be written to the appropriate address. Figure 6 shows the method for programming all locations.

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