DS2786 Stand-Alone OCV-Based Fuel Gauge

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POWER MODES

The DS2786 operates in one of two power modes: Active and Sleep. While in Active mode, the DS2786 operates

as a high-precision battery monitor with temperature, voltage, auxiliary inputs, current, and accumulated current

measurements acquired continuously and the resulting values updated in the Measurement Registers. In Sleep

mode, the DS2786 operates in a low-power mode with no measurement activity. Read and write access is allowed

to all registers in either mode.

The DS2786 operating mode transitions from Sleep to Active when:

The DS2786 operating mode transitions from Active to Sleep when:

CAUTION:

If SMOD = 1, a pullup resistor is required on SCL and SDA in order to ensure that the DS2786

transitions from Sleep to Active mode when the battery is charged. If the bus is not pulled up, the DS2786 remains

in Sleep and cannot accumulate the charge current. This caution statement applies particularly to a battery that is

charged on a stand-alone charger.

PARAMETER MEASUREMENT

The DS2786 uses a Sigma Delta A/D converter to make measurements. The measurement sequence shown in

temperature using its on-chip sensor instead of the AIN1 input. When the internal temperature measurement uses

1760ms to complete.

Figure 4. Measurement Sequence