DA9061 datasheet(39/82 Pages) DIALOG

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DA9061

Entry level PMIC for applications requiring up to 6 A

Datasheet

Revision 3.2

01-Mar-2016

CFR0011-120-00 Rev 5

39 of 82

POWERDOWN mode

6.8.3

The POWERDOWN mode is a low-power state where most of the regulators are disabled. The

transition from active to POWERDOWN mode (and vice versa) is handled by the programmable

sequencer. Entry to POWERDOWN mode from ACTIVE mode is triggered by the de-assertion of

SYSTEM_EN (either via SYS_EN or register access) or by a short press of nONKEY. The

POWERDOWN mode is also passed during start-up and shutdown to RESET mode sequences.

In POWERDOWN mode the internal supplies are enabled, and the control interface and GPIOs are

operational.

The power state machine features a retry counter that limits the number of transitions from

POWERDOWN to ACTIVE under certain conditions. A watchdog timeout triggers POWERDOWN

mode entry, but it does not necessarily clear the conditions that trigger a transition back to the

ACTIVE mode. This could cause an endless loop between the ACTIVE and POWERDOWN modes.

Therefore, after each watchdog timeout the retry counter is decremented, and after the retry counter

reaches zero, DA9061 blocks all wakeup events and stays in POWERDOWN mode. This freeze

function can be regarded as a substate of the POWERDOWN mode that is undetectable from

outside the DA9061.

Table 22 describes the state transitions with a level-sensitive wakeup and the freeze function.

Table 22: State transitions with a level-sensitive (LS) GPI

Current state

LS GPI

SYS_EN

PWR_EN

Freeze

Note 2

Next state

POWERDOWN

SYSTEM

POWERDOWN

ACTIVE

POWERDOWN

SYSTEM

POWERDOWN

ACTIVE

SYSTEM

POWERDOWN

SYSTEM

ACTIVE

SYSTEM

ACTIVE

POWERDOWN

ACTIVE

SYSTEM

ACTIVE

SYSTEM

ACTIVE

Note 2

In this table, “Freeze” represents the result of the comparison retry count = 0.

The following events will reset the retry counter and release the state machine from the freeze state:

● De-assertion of all blocked level-sensitive wakeup conditions

● Entry to the RESET mode (over-temperature error, nRESETREQ or long press of nONKEY)

The freeze operation is illustrated in Figure 17. Once the freeze state is cleared, DA9061 continues

operating normally. The freeze function can be enabled in the FREEZE_EN register and the number

of retries triggering the freeze can be configured in NFREEZE.

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