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BQ2004 Datasheet(PDF) 7 Page - Texas Instruments

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Part # BQ2004
Description  Fast-Charge IC
PDF  16 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

BQ2004 Datasheet(HTML) 7 Page - Texas Instruments

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When the SNS voltage is greater than VSNSHI, the MOD
output is switched low—shutting off charging current to
the battery.
VSNSLO = 0.04
∗ VCC ± 25mV
VSNSHI = 0.05
∗ VCC ± 25mV
When used to gate an externally regulated current
source, the SNS pin is connected to VSS, and no sense re-
sisitor is required.
7
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
TS
TCO
TM2
TM1
LED1
DCMD
DVEN
VTS - VSNS
VBAT - VSNS
LED2
DSEL
PWR
Control
Figure 3. Block Diagram
Mode 1
Charge Status
LED1
LED2
DSEL = VSS
Battery absent
Low
Low
Fast charge pending or discharge-before-charge in progress
High
High
Fast charge in progress
Low
High
Charge complete, top-off, and/or trickle
High
Low
Mode 2
Charge Status
LED1
LED2
DSEL = Floating
Battery absent, fast charge in progress or complete
Low
Low
Fast charge pending
High
Low
Discharge in progress
Low
High
Top-off in progress
High
High
Mode 3
Charge Status
LED1
LED2
DSEL = VCC
Battery absent
Low
Low
Fast charge pending or discharge-before-charge in progress
Low
1/8s high
1/8s low
Fast charge in progress
Low
High
Fast charge complete, top-off, and/or trickle
High
Low
Table 2. bq2004 LED Status Display Options
bq2004



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