DS2781G+ Maxim Integrated Products, DS2781G+ Datasheet - Page 19

• Manufacturer Part Number: DS2781G+
• Description: IC FUEL GAUGE STND ALONE 10-TDFN
• Manufacturer: Maxim Integrated Products

Specifications of DS2781G+

• 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: 10-TDFN Exposed Pad
• 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

STATUS REGISTER
The STATUS register contains bits that report the device status. The bits can be set internally by the DS2781. The
CHGTF, AEF, SEF, LEARNF and VER bits are read only bits that can be cleared by hardware. The UVF and
PORF bits can only be cleared via the 1-Wire interface.
Figure 18. Status Register Format
CHGTF
AEF
SEF
LEARNF
Reserved
UVF
PORF
Reserved
* - This bit can be set by the DS2781, and may only be cleared through the 1-Wire interface.
** - LEARNF is only cleared if ACR reaches 0 after VOLT < VAE.
ADDRESS
FIELD
01h
BIT
7
6
5
4
3
2
1
0
FORMAT
Write *
Write *
Read /
Read /
Read
Read
Read
Read
Read
Read
Only
Only
Only
Only
Only
Only
Charge Termination Flag
Set to 1 when: ( VOLT > VCHG ) AND ( 0 < IAVG < IMIN ) continuously
for a period between two IAVG register updates ( 28s to 56s ).
Cleared to 0 when: RARC < 90%
Active Empty Flag
Set to 1 when: VOLT < VAE
Cleared to 0 when: RARC > 5%
Standby Empty Flag
Set to 1 when: RSRC < 10%
Cleared to 0 when: RSRC > 15%
Learn Flag⎯When set to 1, a charge cycle can be used to learn battery
capacity.
Set to 1 when: ( VOLT falls from above VAE to below VAE ) AND
( CURRENT > IAE )
Cleared to 0 when: ( CHGTF = 1 ) OR ( CURRENT < 0 ) OR
( ACR = 0 **) OR ( ACR written or recalled from EEPROM) OR ( SLEEP
Entered )
Undefined
Undervoltage Flag
Set to 1 when: VOLT < V
Cleared to 0 by: User
Power-On Reset Flag⎯Useful for reset detection, see text below.
Set to 1 upon Power-Up by hardware.
Cleared to 0 by: User
Undefined
19 of 31
ALLOWABLE VALUES
SLEEP
BIT DEFINITION