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DA9072

Ultra-Low Quiescent Current PMIC

Datasheet

Revision 3.0

14-Jun-2021

CFR0011-120-00

36 of 113

4.4.3

Pre-Charge and Termination Current

In Pre-Charge mode, a constant low-level charge current is supplied to the battery, up to 50 mA.

Termination current is the charge current in CV mode at which charging is terminated. Both pre-

charge current and termination current are identical and cannot be controlled independently. The

current setting is selectable by the IPRETERM bits (register 0x0023 [6:0]) within a range of 0.5 mA to

50 mA. Pre-charge and termination currents can also be set by an external resistor connected to the

ITER_CHG pin.

Charge termination can be disabled by setting the termination enable bit, TE (register 0x0021

[4]) = 0. TS_WARM (register 0x0021 [5]) and TS_COOL (register 0x0021 [6]) conditions can also

optionally disable termination. This may be useful in conditions where the available charging current

is reduced due to system load, or when charge current is reduced due to fault conditions.

The pre-charge-to-fast-charge threshold voltage is programmable between 2.7 V and 3.2 V via

BPRECHG bits (register 0x0025 [2:0)]. The threshold has 200 mV of hysteresis. When VBAT rises

above the pre-charge threshold voltage, fast charging begins.

Pre-charging is indicated by an SYS_FLT interrupt and ISR_PRECHG event bit (register 0x0005 [2]).

4.4.4

Fast Charge Current

In Fast Charge mode, a constant charging current is supplied to the battery at up to 500 mA. Fast

charge current is selectable by the ICHG bits (register 0x0022 [6:0]). This can also be set by an

external resistor connected to ILIM_CHG pin. Charge current is programmable from 5 mA to 500 mA

with an accuracy of +/-5 % over the full range. Fast charge current settings down to 2 mA are

available with some OTP variants.

When VBAT reaches VBAT_CHG the device ends CC fast charge operation and starts CV operation.

4.4.5

CV Voltage Regulation and Termination

CV mode begins when the battery voltage rises into the regulation range. The regulated battery

voltage, VBAT_CHG, is set between 3.6 V and 4.65 V by the VBCHG bits (register 0x0024 [6:0].

Regulation accuracy is +/-0.5 % in CV mode.

When the DA9072 enters CV mode, charge current begins gradually decreasing, while battery

voltage remains regulated at VBAT_CHG. When charge current drops to the termination current

level, charging is terminated and the charge status, STS_CHG, changes to charge done.

Charge done is indicated by an SYS_FLT interrupt and event bit ISR_CHG_DONE (register

0x0005 [3]).

To ensure that the charging current is below the termination level, termination does not occur until

the peak current is below the threshold. In noisy conditions or at very low termination currents, the

average battery current at termination may be a few mA below the set threshold.

4.4.6

Charge Done and Recharge

To prevent rapid iterations of charging and discharging from the charge done state, there is 120 mV

of hysteresis below the CV regulation level, VRCH. Charging does not restart until VBAT falls below

this threshold. In addition, there is a 32 msec deglitch time for noise immunity.

Recharging starts automatically, when VBAT falls below the VRCH threshold. Recharging is

indicated by an SYS_FLT interrupt and event bit ISR_RECHG_START (register 0x0005 [4]).

4.4.7

Charge Faults

The DA9072 identifies multiple conditions as charge faults, indicated by the STS_CHG status bits

(register 0x0002 [5:4]). These conditions may reduce the charge current, reduce the target battery

voltage, or take other actions. All are indicated by an interrupt and event bit. When the charger is

unable to provide the programmed charge current to the battery, such as when VDD_PWR is in

current limit, the termination current is ignored and charging is allowed to continue until the safety

timer expires. All of the fault and event interrupts that affect charging are summarized in Table 26.

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