BQ2007STR datasheet(5/16 Pages) TI1

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Outputs LED1–2 have three display modes that are

selected at initialization by the input pins DSEL1 and

DSEL2. The DSEL1 and DSEL2 input pins, when pulled

down to VSS, are intended for implementation of a

simple two-LED system. LED2 indicates the precharge

status (i.e., charge pending and discharge) and LED1 indi-

cates the charge status (i.e., charging and completion).

DSEL1 pulled up to VCC and DSEL2 pulled down to VSS

mode is for implementation of a single tri-color LED such

that discharge, charging, and completion each have a unique

color. DSEL1 pulled down to VSS and DSEL2 pulled up to

VCC allows for fault status information to be displayed.

Audio Output Alarm

The bq2007 audio alarm output generates an audio tone

to indicate a charge completion or fault condition. The

audio alarm output is a symmetrical duty-cycle AC sig-

nal that is compatible with standard piezoelectric alarm

elements. A valid battery insertion is indicated by a sin-

gle high-tone beep of 12-second typical duration.

The

charge completion and fault conditions are indicated by

a 9.5- to 15-second high-tone sequence of 12-second typi-

cal duration at a 2-second typical repetition rate.

Charge Status Monitoring

The bq2007 charge status monitor may display the bat-

tery voltage or charge safety timer as a percentage of

the full-charged condition. These options are selected

with the MULT soft-programmed input pin.

When MULT is pulled down to VSS, the battery charge

status is displayed as a percentage of the battery

voltage, and the single-cell battery voltage at the BAT

pin is compared with internal charge voltage reference

thresholds.

When VBAT is greater than the internal

thresholds of V20,V40,V60,orV80, the respective 20%,

40%, 60%, or 80% display outputs are activated. The

battery voltage directly indicates 20% charge

increments, while the 10% charge increments use a

timer that is a function of the charge safety timer.

When MULT is pulled down to VSS and when VBAT

exceeds V20 during charging, the 20% charge indication

is activated and the timer begins counting for a period

equal to 164 to 132 of the charge safety time-out period.

When the timer count is completed, the 30% charge

indication is activated. Should VBAT exceed V40 prior to

the timer count completion, the charge status monitor

activates the 30% and 40% indications. This technique

SLUS076A – JULY 2000

bq2007

Charge Action

State

Conditions

MOD Output

DIS Output

Battery absent

VCC applied and VCELL

≥ VMCV

Trickle charge per Table 4

Low

Charge initiation

VCC applied or VCELL drops

from

≥ VMCV to<VMCV

Low

Discharge-before-

charge

DCMD high-to-low transition or to VSS on charge

initiation and VEDV <VCELL <VMCV

Low

High

Charge pending

Charge initiation occurred and VTEMP

≥ VLTF or

VTEMP

≤ VTCO or VCELL <VEDV

Trickle charge per Table 4

Low

Fast charging

Charge pending complete and FAST = VCC

Low if VSNS > 250mV;

high if VSNS < 200mV

Low

Standard charging

Charge pending complete and FAST = VSS

Low if VSNS > 250mV;

high if VSNS < 200mV

Low

Charge complete

∆ V termination or VTEMP <VTCO or PVD ≥ 0to

-3mV/cell or maximum time-out or VCELL >VMCV

Top-off pending

VSEL = VCC, charge complete and VTEMP

≥ VLTF or

VTEMP

≤ VTCO or VCELL <VEDV

Trickle charge per Table 4

Low

Top-off charging

VSEL = VCC and charge complete and

time-out not exceeded and VTEMP >VTCO and

VCELL <VMCV

Activated per VSNS for

73ms of every 585ms

Low

Trickle charging

Charge complete and top-off disabled or

top-off complete or pending

Trickle charge per Table 4

Low

Fault

Charge pending state and charge pending

time-out (tPEND) complete

Trickle charge per Table 4

Low

Definitions:

VCELL =VBAT -VSNS;VMCV = 0.8 * VCC;VEDV = 0.262 * VCC or 0.4 * VCC;VTEMP =VTS -VSNS;

VLTF = 0.5 * VCC.

Table 1. bq2007 Operational Summary

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