Features
➤ Fast charging and conditioning of
NiCd and NiMH batteries
- Precise charging independent
of battery pack number of cells
- Discharge-before-charge on
demand
- Pulse trickle charge
conditioning
- Battery undervoltage and
overvoltage protection
➤ Built-in 10-step voltage-based
charge status monitoring
- Charge status display options
include seven-segment
monotonic bargraph and fully
decoded BCD digit
- Display interface options for
direct drive of LCD or LED
segments
- Charger state status
indicators for pending,
discharge, charge, completion,
and fault
- Audible alarm for charge
completion and fault
conditions
➤ Charge control flexibility
- Fast or Standard speed
charging
- Top-off mode for NiMH
- Charge rates from
C
8
to 2C
(30 minutes to 8 hours)
➤ Charge termination by:
- Negative delta voltage (-∆V)
- Peak voltage detect (PVD)
- Maximum voltage
- Maximum time
- Maximum temperature
➤ High-efficiency switch-mode de-
sign
- Ideal for small heat-sensitive
enclosures
➤ 24-pin, 300-mil SOIC or DIP
General Description
The bq2007 is a highly integrated
monolithic CMOS IC designed to pro-
vide intelligent battery charging and
charge status monitoring for stand-
alone charge systems.
The bq2007 provides a wide variety of
charge status display formats. The
bq2007 internal charge status moni-
tor supports up to a seven-segment
bargraph or a single BCD digit dis-
play. The bargraph display indicates
up to seven monotonic steps, whereas
the BCD digit counts in ten steps of
10% increments. The bq2007 output
drivers can direct-drive either an
LCD or LED display.
Charge action begins either by appli-
cation of the charging supply or by
replacement of the battery pack. For
safety, charging is inhibited until
battery temperature and voltage are
within configured limits.
1
1
PN200701.eps
24-Pin Narrow DIP
or SOIC
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17
9
10
16
15
11
12
14
13
SEGC/MSEL
SEGB
SEGA
LED1
LED2
INH
COM
ALARM
TM
VSEL
FAST
DCMD
SEGD/DSEL1
SEGE/DSEL2
SEGF/MULT
SEGG/QDSEL
MOD
VCC
VSS
DIS
TS
BAT
SNS
TCO
Fast-Charge IC
bq2007
Pin Connections Pin Names
SEGC/ Display output segment C/
MSEL driver mode select
SEG
B Display output segment B
SEG
A
Display output segment A
LED
1
Charge status output 1
LED2 Charge status output 2
INH Charge inhibit input
COM Common LED/LCD output
ALARM Audio alarm output
TM Timer mode select
VSEL Voltage termination select
FAST Fast charge rate select
DCMD Discharge command
TCO Temperature cutoff
SNS Sense resistor input
BAT Battery voltage
TS Temperature sense
DIS Discharge control
V
SS System ground
V
CC 5.0V ±10% power
MOD Modulation control
SEG
G/ Display output segment G/
QDSEL charge status display select
SEG
F/ Display output segment F/
MULT multi-cell pack select
SEG
E/ Display output segment E/
DSEL
2 display select 2
SEG
D/ Display output segment D/
DSEL
1
display select 1
9/96 B