BQ2040SN-C408 BENCHMARQ, BQ2040SN-C408 Datasheet - Page 19

• 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

Where LTF is:
Bit 0, the Overcurrent flag (OC), is set when Current is
25% greater than the programmed charging current. If
the charging current is programmed less than 1024mA,
overcurrent is set if Current is 256mA greater than the
programmed charging current. This flag is cleared when
Current falls below 256mA.
The OC value is:
Where OC is:
FLAGS1
Bits 7 indicates that a
exists.
The T/ t value is:
Where T/ t is:
Bit 6 indicates that a current taper termination condi-
tion exists.
7
0
1
7
0
1
0
1
T/ t
-
-
7
Temperature > 15°C
Temperature < 12°C
Current is less than 1.25
rent or less than 256mA if charging current
is programmed less than 1024mA
Current exceeds 1.25
256mA if the charging current is pro-
grammed less than 1024mA. This bit is
cleared if Current < 256mA.
The T/ t rate drops below the pro-
grammed rate.
The T/ t rate exceeds the programmed
rate.
I
6
MIN
-
6
6
-
5
-
5
5
-
-
FLAGS1 Bits
FLAGS1 Bits
FLAGS2 Bits
4
-
4
-
4
-
T/ t termination condition
3
-
ChargingCurrent or
3
-
3
-
ChargingCur-
2
-
2
-
2
-
1
-
1
1
-
-
OC
0
0
-
-
0
19
The I
Where I
The Valid Charge flag (VQ), bit 5, is set when V
|V
is cleared during a discharge and when V
The VQ value is:
Where VQ is:
Bit 4 is reserved.
The Valid Discharge flag (VDQ), bit 3, is set when a
valid discharge is occurring (discharge cycle valid for
learning new full charge capacity) and cleared if a par-
tial charge is detected, EDV1 is asserted when T < 0°C,
or self-discharge accounts for more than 256mAh of the
discharge.
The VDQ value is:
Where VDQ is:
The Overload flag (OVLD), bit 2, is set when the dis-
charge current is greater than the programmed rate and
cleared when the discharge current falls below the pro-
grammed rate.
7
7
0
1
SRD
0
1
0
1
7
-
-
-
MIN
| and 10mAh of charge has accumulated. This bit
A valid current taper termination condition
is not present.
Valid current taper termination condition
detected.
V
V
accumulated
Self-discharge is greater than 256mAh,
EDV1 = 1 when T < 0°C or VQ = 1
On first discharge after RM=FCC
MIN
value is:
SRO
6
SRO
6
6
-
-
-
is:
|V
|V
5
5
-
-
VQ
5
SRD
SRD
FLAGS1 Bits
|
FLAGS1 Bits
FLAGS1 Bits
| and 10mAh of charge has
4
4
-
-
4
-
VDQ
3
-
3
3
-
OVLD
2
2
2
-
-
SRO
bq2040
1
|V
1
1
-
-
-
SRD
SRO
|.
0
0
-
-
0
-