BQ2040SN-C408 BENCHMARQ, BQ2040SN-C408 Datasheet - Page 17

• 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

DesignCapacity() (0x18)
This read-only word returns the theoretical capacity of a
new pack. The DesignCapacity value is expressed in
mAh at the nominal discharge rate.
DesignVoltage() (0x19)
This read-only word returns the theoretical voltage of
a new pack in mV.
SpecificationInfo() (0x1a)
ManufactureDate() (0x1b)
This read-only word returns the date the cell was manu-
factured in a packed integer word. The date is packed
as follows: (year - 1980) 512 + month 32 + day.
Note:
Month
FLAGS2 DMODE
FLAGS1
Field
Year
Day
Range: 0 to 65,535 cycles; 65,535 indicates battery
has experienced 65,535 or more cycles.
Granularity: 1 cycle
Output: unsigned integer. Returns the battery ca-
pacity in mAh.
Units: mAh
Range: 0 to 65,535mAh
Output: unsigned integer. Returns the battery's
normal terminal voltage in mV.
Units: mV
Range: 0 to 65,535mV
This read-only word returns the specification re-
vision the bq2040 supports.
Used
9–15
Bits
0–4
5–8
- = Reserved
(MSB) 7
T/ t
5-bit binary
4-bit binary
7-bit binary
Format
value
value
value
PSTAT
Table 6. Bit Descriptions for FLAGS1 and FLAGS2
I
MIN
6
1–31 (corresponds to
date)
1–12 (corresponds to
month number)
0–127 (corresponds to
year biased by 1980)
Allowable Value
CHM
VQ
5
CC
4
-
17
SerialNumber() (0x1c)
This read-only word returns a serial number. This
number, when combined with the ManufacturerName,
the DeviceName, and the ManufactureDate, uniquely
identifies the battery.
ManufacturerName() (0x20)
This read-only string returns a character string where the
first byte is the number of characters available. The maxi-
mum number of characters is 11. The character string con-
tains the battery manufacturer's name. For example,
“Benchmarq” identifies the battery pack manufacturer as
Benchmarq.
DeviceName() (0x21)
This read-only string returns a character string where the
first byte is the number of characters available. The maxi-
mum number of characters is 7. The 7-byte character string
contains the battery's name. For example, a DeviceName of
“bq2040” indicates that the battery is a model bq2040.
DeviceChemistry() (0x22)
This read-only string returns a character string where
the first byte is the number of characters available. The
maximum number of characters is 5. The 5-byte charac-
ter string contains the battery's chemistry. For example,
if the DeviceChemistry function returns “NiMH,” the
battery pack contains nickel-metal hydride cells.
ManufacturerData() (0x23)
This read-only string allows access to an up to 5-byte
manufacturer data string.
Output: unsigned integer
Output: string or ASCII character string
Output: string or ASCII character string
Output: string or ASCII character string
Output: block data—data whose meaning is as-
signed by the Smart Battery's manufacturer.
VDQ
3
-
OVLD
OV
2
EDV1
LTF
1
bq2040
0 (LSB)
EDVF
OC