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DA9072

Ultra-Low Quiescent Current PMIC

Datasheet

Revision 3.0

14-Jun-2021

CFR0011-120-00

35 of 113

Figure 23: Typical Charging Example

Note 1

70 mAh Charge Cycle (VCHG_PRE = 3.0 V, ICHG_PRE = 7 mA, ICHG = 70 mA, VTER = 4.2 V)

4.4.2

Charge in Progress

Assuming a depleted battery, the battery is initially charged at ICHG_PRE until VBAT reaches the pre-

charge threshold, at which point the charge current is increased to ICHG. The charger continues to

charge at constant current (CC) until VBAT approaches the target voltage programmed by VBCHG

(register 0x0024:[6:0]). The battery is then charged at near constant voltage (CV) and the charge

current gradually falls. Charging ends when the charge current falls below ITER (ITER current is the

same as ICHG_PRE, see Section 4.7.1). If the VDD_PWR remains connected, recharging starts when

VBAT falls below the recharge threshold, VBAT_CHG - 120 mV (typical).

Charging modes are shown in Table 25.

Table 25: Charging Modes

VBAT Voltage

Charge Current

Charge Mode

Pre-Charge Timer

Main Timer

VBAT < VCHG_PRE

ICHG_PRE

Pre-charge

Running

VCHG_PRE < VBAT < VBAT_CHG

ICHG

CC (fast charge)

Reset

Running

VBAT = VBAT_CHG

< ICHG

Reset

Running

VBAT = VBAT_CHG

= ITER

Termination

Reset

From the charge ready state, the device enters charge in-progress state when all conditions below

are met.

● VDD_PWR > VBAT + VSLP (not in Sleep mode)

● VBAT < VRCHG

● RMEAS sequence completed, if enabled by RMEAS_EN (register 0x0020 [1])

● 50 ms TEMP_SNS delay, if periodic sampling is enabled by TS_DISCHG_MODE_SEL (register

0x0026 [5])

● MODE input is pulled low and CE_N register is set to 0

If these conditions are met, charging starts automatically at the appropriate level when VDD_PWR is

connected.

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