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DA6021

HIGHLY INTEGRATED POWER MANAGEMENT IC FOR

INTEL® ATOM™ Z3000 PROCESSOR

Company Confidential

Data Sheet

Version 3.A - Final

31-Jan-14

30 of 224

www.dialog-semiconductor.com

DA6021 Power States

9.2

Following is a brief description of these states:



OFF: No power at all. The platform coin cell has no valid power.



COIN: COIN domain is powered and not under reset. Coin domain refers to a small logic portion inside

DA6021, which gets a reset signal and supply from the coin cell or a supercap. These logic registers retain

data when DA6021 supply fails or PMIC goes under the POR. These register are sitting on the analog side.

The COIN state is not related to any operation in the PMIC and is not coded. It represents just a possible

supply scenario.



RESET: The digital core which is not supplied from the COIN is under POR due to the fact that the VSYS

input has not crossed yet the POR release threshold.



OTP: Just after POR is released DA6021 goes into OTP state and reads the OTP. In this state all the

trimming, calibration, power sequencing, and platform variant data is read and copied into the operational

registers. This state is crossed only during first power up or when DA6021 is forced by POR or soft reset to

go back into RESET state.



EEPROM: For debugging purpose or as a fallback

solution in the field it’s possible to overwrite the

operational registers via an external EEPROM. This step is always performed from DA6021 after the OTP

state and is done once during first power up if the EEPROM contains. It is assumed that the EEPROM is

supplied at the time of the access.



G3: This state corresponds to a non-valid system supply VSYS (VSYS < VSYSREF = 3.0V). VSYS is not

considered to be good enough for booting.



SOC_G3

: This is by definition the “system power down” state. Application will be mainly looping between

active state and this state. VSYS valid event makes the PMIC going from G3 to SOC_G3 state. Critical

events and power button can lead the PMIC to this state. Only in this state it is possible to be sensitive to the

external wakeup events.

Figure 4: DA6021 Power States

DA6021 will issue an under voltage flag when VSYS will fall below the 2.7V threshold. In this case a shutdown

will be executed bringing down all rails in an ordered fashion. The final state will be G3. The following figure

shows different thresholds which generate events in DA6021.

When VSYS reaches the 2.0 Volt (point B) the POR will happen and DA6021 will go to reset. All the registers will

be initialized with default values. Only registers supplied from RTC will retain their value. POR will be released

COIN

RESET

OTP

EEPROM

SOC_G3

Valid Power on the COIN

domain but no external

power source available for

the platform.

RTC Supply is Valid, but

PMIC is under reset.

VSYS < 2.3V

PMIC out of reset.

Not Valid VSYS.

Valid VSYS.

OFF

No Supply at all. All

registers are under reset.

This states are indipendent from the supply on the COIN domain. PMIC can boot or stay in this stats

even the COIN domain is not supplied.

VSY

S <

2.0

VSY

S >

2.3

75V

VSY

S <

2.7

VSY

S >

3.0

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