DS2777G+ Maxim Integrated Products, DS2777G+ Datasheet - Page 26

• Manufacturer Part Number: DS2777G+
• Description: IC FUEL GAUGE LI+ 2CELL 14-TDFN
• Manufacturer: Maxim Integrated Products

Specifications of DS2777G+

• Function: Fuel, Gas Gauge/Monitor
• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Voltage - Supply: 4 V ~ 9.2 V
• Operating Temperature: -20°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 14-TDFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with
Protector and Optional SHA-1 Authentication
The Status register contains bits that report the device status. All bits are set internally. The CHGTF, AEF, SEF, and
LEARNF bits are read-only.
Bit 7: Charge-Termination Flag (CHGTF). CHGTF is set to indicate that the average of the voltages on V
V
ciently long enough to detect a fully charged condition. CHGTF is cleared when RARC is less than 90%. CHGTF is
read-only.
Bit 6: Active-Empty Flag (AEF). AEF is set to indicate that the battery is at or below the active-empty point. AEF is
set when the average of the voltages on V
greater than 5%. AEF is read-only.
Bit 5: Standby-Empty Flag (SEF). SEF is set to indicate RSRC is less than 10%. SEF is cleared when RSRC is
greater than 15%. SEF is read-only.
Bit 4: Learn Flag (LEARNF). LEARNF indicates that the current-charge cycle can be used to learn the battery
capacity. LEARNF is set when the active-empty point is detected. This occurs when the average of the voltages on
V
greater in magnitude than the IAE threshold. See the Active-Empty Point Detect section for additional information.
LEARNF is cleared when any of the following occur:
LEARNF is read-only.
Bit 3 to 0: Reserved.
26
IN2
IN1
1) Learn cycle completes (CHGTF set).
2) Current register value becomes negative indicating discharge current flow.
3) ACR = 0.
4) ACR value is written or recalled from EEPROM.
5) Sleep mode is entered.
CHGTF
______________________________________________________________________________________
BIT 7
and the Average Current register values have persisted above the VCHG and below the IMIN thresholds suffi-
and V
IN2
drops below the VAE threshold and the two previous current register values were negative and
BIT 6
AEF
BIT 5
SEF
IN1
and V
LEARNF
BIT 4
IN2
is less than the VAE threshold. AEF is cleared when RARC is
BIT 3
X
BIT 2
Status Register Format
X
Status Register (01h)
BIT 1
X
BIT 0
X
IN1
and