DS2784G+ Maxim Integrated Products, DS2784G+ Datasheet - Page 9

• 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

TYPICAL OPERATING CIRCUIT
PIN DESCRIPTION
DETAILED DESCRIPTION
The DS2784 functions as an accurate fuel gauge, Li+ protector, and SHA-1-based authentication token. The fuel
gauge provides accurate estimates of remaining capacity and reports timely voltage, temperature, and current-
measurement data. Capacity estimates are calculated from a piecewise-linear model of the battery performance
over load and temperature, and system parameters for full and empty conditions. The algorithm parameters are
user programmable and can be modified in pack. Critical capacity and aging data are periodically saved to
EEPROM in case of loss of power due to a short circuit or deep depletion.
The Li+ protection function ensures safe, high-performance operation. nFET protection switches are driven with a
9V charge pump that increase gate drive as the cell voltage decreases. The high-side topology preserves the
ground path for serial communication while eliminating the parasitic charge path formed when the fuel gauge IC is
5, 9, 10
PIN
11
12
13
14
—
6
1
2
3
4
7
8
NAME
CTG
N.C.
SNS
PLS
PIO
V
V
CC
DC
DQ
V
CP
EP
DD
SS
IN
Power-Supply Input. Chip supply input. Bypass with 0.1µF to V
Connect to Ground
Device Ground. Chip ground and battery-side sense resistor input.
Battery Voltage-Sense Input. Connect to positive cell terminal through decoupling
network.
No Connection
Pack Plus Terminal-Sense Input. Used to detect the removal of short-circuit, discharge
overcurrent, and charge overcurrent conditions.
Charge Control. Charge FET control output.
Discharge Control. Discharge FET control output.
Data Input/Output. Serial data I/O, includes weak pulldown to detect battery disconnect
and can be configured as wake input.
Sense Resistor Connection. Pack minus terminal and pack-side sense resistor sense
input.
Charge Pump Output. Bypass with 0.1µF to V
Programmable I/O Pin. Can be configured as wake input.
Exposed Pad. Connect to V
9 of 43
SS
or leave unconnected.
FUNCTION
SS
.
SS
.