DS2784G+ Maxim Integrated Products, DS2784G+ Datasheet - Page 26

• Manufacturer Part Number: DS2784G+
• Description: IC FUEL GAUGE STND-ALONE 14-TDFN
• Manufacturer: Maxim Integrated Products

Specifications of DS2784G+

• Function: Fuel, Gas Gauge/Monitor
• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Voltage - Supply: 2.5 V ~ 4.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 14-TDFN
• Product: Fuel Gauges
• Operating Supply Voltage: 2.5 V to 4.6 V
• Supply Current: 85 uA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Charge Safety Timers: Yes
• Mounting Style: SMD/SMT
• Temperature Monitoring: Yes
• Uvlo Start Threshold: 2.4 V
• Uvlo Stop Threshold: 2.5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LEARNF—Learn Flag. 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 voltage register value drops below
the VAE threshold AND the two previous current register values were negative and 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.
UVF—Undervoltage Flag. UVF is set to indicate that the voltage measurement of the V
must be written to a 0 to allow subsequent undervoltage events to be reported. UVF is not cleared internally.
Writing UVF to 0 is effective only when V
persistent undervoltage condition. UVF is set on power-up.
PORF—Power-On Reset Flag. PORF is set to indicate initial power-up. PORF is not cleared internally. The user
must write this flag value to a 0 to use it to indicate subsequent power-up events. If PORF indicates a power-on
reset, the ACR could be misaligned with the actual battery state of charge. The system can request a charge to full
to synchronize the ACR with the battery charge state. PORF is read/write-to-zero.
X—Reserved Bits.
RESULT REGISTERS
The DS2784 processes measurement and cell characteristics on a 3.5s interval and yields seven result registers.
The result registers are sufficient for direct display to the user in most applications. The host system can produce
customized values for system use or user display by combining measurement, result and user EEPROM values.
FULL(T) [ ]—The full capacity of the battery at the present temperature is reported normalized to the 40°C full
value. This 15-bit value reflects the cell model Full value at the given temperature. FULL(T) reports values between
100% and 50% with a resolution of 61ppm (precisely 2
even though the register format permits values greater than 100%.
Active Empty, AE(T) [ ]—The active-empty capacity of the battery at the present temperature is reported
normalized to the 40°C full value. This 13-bit value reflects the cell model active-empty value at the given
temperature. AE(T) reports values between 0% and 49.8% with a resolution of 61ppm (precisely 2
Standby Empty, SE(T) [ ]—The standby-empty capacity of the battery at the present temperature is reported
normalized to the 40°C full value. This 13-bit value reflects the cell model standby-empty value at the current
temperature. SE(T) reports values between 0% and 49.8% with a resolution of 61ppm (precisely 2
Remaining Active Absolute Capacity (RAAC) [mAh]—RAAC reports the remaining battery capacity available
under the current temperature conditions to the active-empty point in absolute units of milliamp-hours (mAhr).
RAAC is 16 bits.
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.
IN
is greater or equal to V
26 of 43
-14
). The register is clamped to a maximum value of 100%
UV
, otherwise, UV remains set due to the
IN
pin is less than V
-14
-14
).
).
UV
, and