BQ2004ESLASHH datasheet(4/23 Pages) TI2

4 / 23 page

The valid temperature range is VHTF <VTEMP <VLTF,

where:

VLTF = 0.4

∗ VCC ± 30mV

VHTF = [(1/3

∗ VLTF) + (2/3 ∗ VTCO)] ± 30mV

VTCO is the voltage presented at the TCO input pin, and is

configured by the user with a resistor divider between VCC

and ground. The allowed range is 0.2 to 0.4

∗ VCC.

If the temperature of the battery is out of range, or the

voltage is too low, the chip enters the charge pending

state and waits for both conditions to fall within their al-

lowed limits. During the charge-pending mode, the IC

first applies a top-off charge to the battery.

The top-off charge, at the rate of 18 of the fast charge,

continues until the fast-charge conditions are met or the

top-off time-out period is exceeded. The IC then trickle

charges until the fast-charge conditions are met. There

is no time limit on the charge pending state; the charger

remains in this state as long as the voltage or tempera-

ture conditons are outside of the allowed limits. If the

voltage is too high, the chip goes to the battery absent

state and waits until a new charge cycle is started.

Fast charge continues until termination by one or more

of the six possible termination conditions:

n Delta temperature/delta time (

∆T/∆t)

n Peak voltage detection (PVD)

n Negative delta voltage (-

∆V)

n Maximum voltage

n Maximum temperature

n Maximum time

PVD and -

∆V Termination

The bq2004E/H samples the voltage at the BAT pin once

every 34s. When -

∆V termination is selected, if VCELL is

lower than any previously measured value by 12mV

±4mV (6mV/cell), fast charge is terminated. When PVD

termination is selected, if VCELL is lower than any previ-

ously measured value by 6mV

±2mV (3mV/cell), fast

charge is terminated. The PVD and -

∆V tests are valid

in the range 0.4

∗ VCC <VCELL < 0.8 ∗ VCC.

bq2004E/H

BD200401.eps

Timing

Control

OSC

Display

Control

Charge Control

State Machine

Discharge

Control

MOD

Control

TCO

Check

LTF

Check

A/D

EDV

Check

MCV

Check

DIS

MOD

INH

VCC VSS

BAT

SNS

TCO

TM2

TM1

LED1

DCMD

DVEN

VTS - VSNS

VBAT - VSNS

LED2

DSEL

PWR

Control

Figure 2. Block Diagram

BQ2004E/H Datasheet(PDF) 4 Page - Texas Instruments

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