bq2016

GAS GAUGE IC FOR

HIGH DISCHARGE RATES

SLUS475A– JANUARY 2001 – REVISED NOVEMBER 2002

16

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

registers (continued)

MCV

The bq2016 sets the MCV bit when it detects that the maximum cell voltage threshold is being exceeded.

Bit = Condition

0

Cell voltage is below the threshold.

1

Cell voltage is above the threshold.

CI

The bq2016 sets the CI bit on reset and when the CPI register exceeds 64.

Bit = Condition

0

An LMD update has occurred.

1

The bq2016 has been reset or the CPI register exceeds 64.

VDQ

The bq2016 sets the VDQ bit when the present discharge cycle is considered valid for an LMD update.

Bit = Condition

0

The present discharge cycle is not valid for an LMD update.

1

The present discharge cycle is valid for an LMD update.

Bit 2 is reserved.

EDV

The bq2016 sets the EDV bit when the battery voltage drops below the EDV threshold. The bit is latched and

remains set until valid charge activity is detected.

Bit = Condition

0

The battery voltage is greater than the EDV threshold.

1

The battery voltage is less than the EDV threshold.

OCE

The bq2016 sets the OCE bit when an VFC offset calibration has been performed.

Bit = Condition

0

Offset calibration not completed

1

Offset calibration completed

TEMP (0x02) – Temperature

The TEMP register contains the battery temperature as computed using the internal temperature sensor of the

bq2016. It is represented in degrees C. The data is an 8-bit signed integer. For example, –10

°C is represented

as F6h.

NAC (0x03) – Nominal Available Capacity

NAC is an 8-bit register that contains the present remaining capacity of the battery pack. The NAC contents are

compensated for rate and temperature. The data is represented in the same units as PFC.

LMD (0x05) – Last Measured Discharge

LMD stores the learned discharge capacity of the battery pack and represents the full charge reference. The

8-bit register presents data in the same units as PFC.

FLAGS2 (0x06) – Second Status Flags

The FLAGS2 register provides bq2016 status information. The 8-bit register includes the following status bits:

7

6

5

4

3

2

1

0

RSVD

DR2

DR1

DR0

RSVD

RSVD

RSVD

OVLD