DA9062 datasheet(55/101 Pages) RENESAS

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DA9062

PMIC for Applications Requiring up to 8.5 A

Datasheet

Revision 3.8

15-Feb-2022

CFR0011-120-00

55 of 99

VSYS dropping below the VDD_FAULT_UPPER threshold asserts the event E_VDD_WARN (in register

EVENT_B). If the event is not masked, this will issue an interrupt, which can be used by the host

processor as an indication to decrease its activity.

If VSYS drops below VDD_FAULT_LOWER for more than 100 ms, the supply error flag VDD_FAULT (in

Section 8.8.3. The nRESET output is asserted at the beginning of the shutdown sequence. The

status can also be reported using a dedicated nVDD_FAULT signal, see Section 8.3.2.1.

8.12 Backup Battery Charger

The backup battery charger is designed to charge Lithium-Manganese coin cell batteries and super

capacitors. The charger provides a constant charge current with a programmable target voltage. The

charging current is programmable from 100 µA to 1000 µA in 100 µA steps and from 1 mA to 6 mA in

1 mA steps. The end-of-charge termination voltage is programmable in 100/200 mV steps from 1.1 V

to 3.1 V. When enabled, the charger will always keep the backup battery charged at its target

voltage. The backup battery charger can be temporarily disabled in POWERDOWN mode via register

BBAT_DIS.

The backup battery charger includes a reverse current protection and can also be used as an

always-on supply for low-power rails.

The backup battery provides an internal supply voltage for the 32 kHz crystal oscillator and RTC.

8.13 Real-Time Clock

The RTC provides a real-time clock and alarm function that can be supplied from the backup battery.

RTC mode is described in Section 8.8.2.

The RTC counter will count the number of 32 kHz clock periods, providing a seconds, minutes,

hours, days, months, and years output. Year 0 corresponds to 2000. It is able to count up to 63

years. The value of the RTC calendar is read- and writeable via the 2-wire interface. A read of

COUNT_S (seconds) saves the current RTC calendar count into registers COUNT_S to COUNT_Y.

Registers are only valid when the RTC_READ status bit is asserted (assertion may take several ms

from leaving POR). After MONITOR has been set, host writing to CRYSTAL and RTC_EN is

prohibited to ensure that the RTC registers SECOND_A to SECOND_D are never stopped.

There is an alarm register containing minutes, hours, day, month, and year. When the RTC counter

generated. The trigger will also set a bit in an event register to notify that an alarm has occurred. The

alarm can alternatively be asserted from a periodic tick signal that, depending on register

TICK_TYPE, is either asserted every second or minute. After modifying TICK_TYPE or TICK_WAKE,

a write to register ALARM_Y is required to activate the new settings.

The power manager controls, ALARM_ON and TICK_ON, enable/disable the alarm/tick.

The power manager register bit MONITOR is set to 0 each time the RTC is powered up. Software

sets this bit to 1 when setting the time and date, which allows detection of a subsequent loss of the

clock. Values written to the RTC calendar and alarm registers have to comply with the allowed value

range (see register description, for example, less than 60 for seconds or minutes).

8.13.1

32 kHz Crystal Oscillator

The oscillator is used to drive the RTC counter. It works with an external piezoelectric oscillator

crystal at 32 kHz. The oscillator output can be fed to a GPIO and used as a clock source in the

platform. The buffer can be enabled/disabled from a control register or with the power sequencer.

In order to achieve the desired crystal frequency an external capacitor (10 pF to 20 pF, depending on

the parasitic capacitance of the board) is connected to ground from each of the crystal pins. The

start-up time of the oscillator is typically between 0.5 s and 1 s over the voltage range. When the

crystal is not mounted, the XTAL pins should be grounded.

The oscillator can be enabled from register CRYSTAL. A stabilization timer can be used to blank the

clock output during the start-up. The timer can be started simultaneously with the oscillator or it can

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