DS2781E+ Maxim Integrated Products, DS2781E+ Datasheet - Page 22

• Manufacturer Part Number: DS2781E+
• Description: IC FUEL GAUGE BATT 8TSSOP
• Manufacturer: Maxim Integrated Products

Specifications of DS2781E+

• Function: Fuel, Gas Gauge/Monitor
• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Voltage - Supply: 2.5 V ~ 10 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-TSSOP
• Operating Supply Voltage: 2.5 V to 10 V
• Supply Current: 70 uA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Charge Safety Timers: No
• Mounting Style: SMD/SMT
• Temperature Monitoring: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PARAMETER EEPROM
Model data for the cells, as well as application operating parameters are stored in the Parameter EEPROM
memory (block 1, addresses 60h–7Fh). The ACR (MSB and LSB) and AS registers are automatically saved to
EEPROM when the RARC result crosses 4% boundaries. This allows the DS2781 to be located outside the
protection FETs. In this manner, if a protection device is triggered, the DS2781 cannot lose more that 4% of charge
or discharge data.
Table 2. Memory Map
*
Register value is automatically saved to EEPROM during ACTIVE mode operation and recalled from EEPROM on power-up.
ADDRESS (HEX)
1C to 1E
80 to AF
B0 to B1
B2 to FF
20 to 2F
30 to 5F
60 to 7F
0C
0D
0A
0B
0E
0F
1A
1B
1F
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
User EEPROM, Lockable, Block 0
Parameter EEPROM, Lockable, Block 1
Reserved
STATUS - Status Register
RAAC - Remaining Active Absolute Capacity MSB
RAAC - Remaining Active Absolute Capacity LSB
RSAC - Remaining Standby Absolute Capacity MSB
RSAC - Remaining Standby Absolute Capacity LSB
RARC - Remaining Active Relative Capacity
RSRC - Remaining Standby Relative Capacity
IAVG - Average Current Register MSB
IAVG - Average Current Register LSB
TEMP - Temperature Register MSB
TEMP - Temperature Register LSB
VOLT - Voltage Register MSB
VOLT - Voltage Register LSB
CURRENT - Current Register MSB
CURRENT - Current Register LSB
ACR - Accumulated Current Register MSB
ACR - Accumulated Current Register LSB
ACRL – Low Accumulated Current Register MSB
ACRL – Low Accumulated Current Register LSB
AS - Age Scalar
SFR - Special Feature Register
FULL - Full Capacity MSB
FULL - Full Capacity LSB
AE - Active Empty MSB
AE - Active Empty LSB
SE - Standby Empty MSB
SE - Standby Empty LSB
Reserved
EEPROM - EEPROM Register
Reserved
Reserved
FSGAIN – Factory Gain Calibration Value
Reserved
DESCRIPTION
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READ/WRITE
R/W *
R/W *
R/W*
R/W
R/W
R/W
R/W
R/W
—
—
—
—
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R