BQ2040SN-C408 BENCHMARQ, BQ2040SN-C408 Datasheet - Page 2

• Manufacturer Part Number: BQ2040SN-C408
• Description: BATTERY CHARGE MONITOR, SMD, 2040
• Manufacturer: BENCHMARQ

Specifications of BQ2040SN-C408

• Battery Management Function: Charger, Status Monitor
• Battery Type: Li-Ion / NiCd / NiMH
• Supply Voltage Range: 3V To 6.5V
• Battery Ic Case Style: SOIC
• No. Of Pins: 16
• Operating Temperature Range: 0°C
• Interface Type: 2-Wire, Serial

bq2040
Pin Descriptions
V
ESCL
ESDA
LED
LED
V
SR
CC
SS
1
4
–
Supply voltage input
Serial memory clock
Serial memory data and address
LED display segment outputs
Ground
Sense resistor input
Output used to clock the data transfer be-
tween the bq2040 and the external non-
volatile configuration memory.
Bidirectional pin used to transfer address
and data to and from the bq2040 and the ex-
ternal nonvolitile configuration memory.
Each output may drive an external LED.
The voltage drop (V
V
to interpret charge and discharge activity.
The SR input is connected to the sense re-
sistor and the negative terminal of the
battery. V
V
voltage drop, V
is V
SS
SR
SR
is monitored and integrated over time
> V
+ V
SS
OS
SR
indicates charge. The effective
. (See Table 3.)
< V
SRO
SS
indicates discharge, and
, as seen by the bq2040
SR
) across pins SR and
2
DISP
SB
PSTAT
SMBD
SMBC
REF
V
OUT
Display control input
Secondary battery input
Protector status input
SMBus data
SMBus clock
Open-drain bidirectional pin used to clock
the data transfer to and from the bq2040.
Reference output for regulator
Supply output
Supplies power to the external EEPROM con-
figuration memory.
DISP high disables the LED display. DISP
floating allows the LED display to be active
during charge if the rate is greater than
100mA. DISP low activates the display for
4 seconds.
Monitors the pack voltage through a high-
impedance resistor divider network.
pack voltage is reported in the SBD register
function Voltage (0x09) and is monitored for
end-of-discharge voltage and charging volt-
age parameters.
Provides overvoltage status from the Li-Ion
protector circuit and can initiate a charge sus-
pend request.
Open-drain bidirectional pin used to transfer
address and data to and from the bq2040.
REF provides a reference output for an op-
tional FET-based micro-regulator.
The