BQ2063_15 Datasheet, PDF (23/60 Pages) Texas Instruments – SBS v1.1-COMPLIANT Li-ION GAS-GAUGE IC

Not Recommended For New Designs
bq2063
SBS v1.1ĆCOMPLIANT LiĆION GASĆGAUGE IC
WITH PROTECTOR INTERFACE
SLUS468E− MAY 2001 − REVISED APRIL 2002
If a communication error occurs (e.g., t_CYCB > 250 µs), the host sends the bq2063 a BREAK to reinitiate the
serial interface. The bq2063 detects a BREAK when the HDQ16 pin is in a logic-low state for a time t_B or greater.
The HDQ16 pin is then returned to its normal ready high-logic state for a time t_BR. The bq2063 is then ready
to receive a command from the host processor.
The HDQ16 pin is open drain and requires an external pullup resistor.
Figure 2 shows the HDQ16 break timing for the bq2063.
command codes
The SMBus command codes are in ( ), the HDQ16 in [ ]. Temperature( ), Voltage( ), Current( ), and
AverageCurrent( ), performance specifications are at regulated V_CC (V_(RO)) and a temperature of 0-70_C.
ManufacturerAccess( ) (0x00); [0x00-0x01]
Description: This function provides writable command codes to control the bq2063 during normal operation
and pack manufacture. These commands may be ignored if sent within one second of a device reset. The
following commands are available:
0x0618 Enable Low-Power Storage Mode activates the low-power storage mode. The bq2063 enters the
storage mode after a 5-8 second delay. The bq2063 accepts other commands to ManufacturerAccess( ) during
the delay before entering low-power storage mode. The LEDs must be off before entering the low-power storage
mode as the display state remains unchanged.
The bq2063 clears the ManufacturerAccess( ) command within 900ms of acknowledging the Enable
Low-Power Storage command. During the delay following the low-power storage command, a VFC Calibration
command may be issued. The VFC Calibration command must be sent 900-5000ms after SMBus
acknowledgment of the Enable Low-Power Storage command. The bq2063 delays entering storage mode until
the calibration process completes and the bq2063 stores the new calibration values in EEPROM.
0x062b SEAL instructs the bq2063 to restrict access to those functions listed in Table 3. Note: The SEAL
command does not change the state of the SEAL bit in Pack Configuration in EEPROM. The bq2063 completes
the seal function and clears ManufacturerAccess( ) within 900 ms of acknowledging the command.
0x064d Charge Synchronization instructs the bq2063 to update RM to a percentage of FCC as defined in Fast
Charge Termination %. The bq2063 updates RM and clears ManufacturerAccess( ) within 900ms of
acknowledging the command.
0x0653 Enable VFC Calibration instructs the unsealed bq2063 to begin VFC calibration. With this command
the bq2063 deselects the SR₁ and SR₂ inputs and calibrates for IC offset only. It is best to avoid charge or
discharge currents through the sense resistor during this calibration process.
0x067e Alternate VFC Calibration instructs the unsealed bq2063 to begin VFC calibration. With this command
the bq2063 does not deselect the SR₁ and SR₂ inputs and does calibrate for IC and PCB offset. During this
procedure no charge or discharge currents must flow through the sense resistor.
During VFC calibration, the bq2063 disables the LED display and accepts only the Enable Low-Power Storage
mode, the Stop VFC Calibration, and the SEAL commands to ManufacturerAccess( ). The bq2063 disregards
all other commands. SMBus communication should be kept to a minimum during VFC calibration to reduce the
noise level and allow a more accurate calibration.
Once started, the VFC calibration procedures completes automatically. When complete, the bq2063 saves the
calibration values in EEPROM. The calibration normally takes about 8 to 10 minutes. The calibration time is
inversely proportional to the bq2063 VFC (and PCB) offset error. The bq2063 caps the calibration time at one
hour in the event of calibrating zero offset error. The VFC calibration can be done as the last step in a battery
pack test procedure since the calibration can complete automatically after removal from a test setup.
The bq2063 clears ManufacturerAccess( ) within 900 ms and starts calibration within 3.2 seconds of
acknowledging the command.
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