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DA9072

Ultra-Low Quiescent Current PMIC

Datasheet

Revision 3.0

14-Jun-2021

CFR0011-120-00

34 of 113

4.3.2

Battery Voltage Monitoring

The VBAT_DIV function divides down the Kelvin sensed battery voltage (from VBAT_SNS) and

provides a selectable output, via VBAT_DIV_RATIO (register 0x000E [4]), scaled at 60 % or 30 % of

VBAT. Use the dedicated ground at GND_DIV as the reference point for the VBAT_DIV output.

This is ideal for driving the differential input of an external ADC in battery monitoring functions.

VBAT_DIV is enabled and disabled by bit VBATDIV_EN (register 0x000F [0]). When enabled, the

total resistance from VBAT_SNS to GND is 150 k

Ω. To maintain accuracy, a high impedance

connection is recommended at VBAT_DIV. When disabled the VBAT_DIV resistor divider is

disconnected from VBAT to eliminate current drain.

Table 23: VBAT_DIV Ratios

VBAT_DIV_RATIO Bit (Register 0x000E [4])

VBAT_DIV Ratio

0.6 *VBAT

0.3 *VBAT

4.4

Battery Charging

4.4.1

Battery Charging Process

When USB power is connected (VDD_PWR > VDD_PWR_UVLO), DA9072 is in one of four states, see

Table 24. Charging is enabled and disabled by the MODE pin and CE_N bit (register 0x0020:[0]).

This status is indicated by the STS_CHG bits (register 0x0002 [5:4]).

Table 24: Charge Status

MODE Pin

CE_N Bits

ICHG Pin

VBAT Pin

Charge Status

STS_CHG Bits

Either High

N/A

Charge ready

0x0

> ITER

<= VBAT_CHG

Charge in-

progress

0x1

< ITER

>= VRCHG

Charge done

0x2

N/A

Fault

0x3

STS_CHG bits are read only and shows immediate charge status only. The bits do not hold status

value and change the value immediately when the charge status changes.

From the charge ready state, charging begins when the CE_N bit is low and the MODE input is

pulled low. There is approximately 2.5 ms delay between enabling charging and charge starting.

Charging current operates in three regions based on battery voltage: pre-charge, fast charge (CC),

and constant voltage (CV). These regions are shown in the typical charging example of Figure 23.

The charge status (shown as CHG_STS in the graph) is also shown transitioning from the charge

ready to charge in-progress to charge done states.

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