DA6021 datasheet(165/225 Pages) RENESAS

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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

165 of 224

www.dialog-semiconductor.com

VSYS goes back

above VWARNB

threshold due to BCU

response. Still in

Warning Zone A.

After the de-bounce

period for VWARNB,

the BCU interrupts

SOC with BCUIRQ

and VWARNBIRQ

bits...

De-assert BCUDISB

and/or PROCHOT_B

(if not sticky).

VWARNA and/or

PROCHOT_B may

stay asserted since

still in Warning Zone

Gets interrupt and knows

system is out of warning

Zone A. If pin assertion is

sticky, will clear BCUDISB

and/or PROCHOT_B

assertion.

Table 102: VSYS Event Table

Under- & Over- Voltage Condition

16.3.3

Two comparator inputs monitor whether VSYS is between 2 predefined thresholds under-voltage (2.7V) and the

over-voltage (5.5V±100mV).

Both comparators will have built-in hysteresis and in both cases the system will perform an immediate shutdown

without processor control. This protects the system from damage due to over-voltage or in the under-voltage

condition ensures the system does not become unstable because on the DA6021 has insufficient power..

Refer to the introduction section for an overview of the catastrophic events.

In the case of the over-voltage flag the system will go to the SOC_G3 state and wait there until the overvoltage

input flag is removed. Then the system is able to wake up again.

In the case of the under-voltage condition the VSYS is too low being considered valid and the analog circuitry

cannot work properly. DA6021 will initiate a system shut down regardless of the SoC state and will end up in G3

state. It will stay here until the VSYS becomes valid again (VSY is valid, from input source detection logic). If the

voltage on VSYS drops again, it will reach the POR level and DA6021 will go into the RESET state (under POR)

There will be no IRQ sent to DA6021 due to over or under-voltage condition. Both under- and over-voltage

conditions are de-bounced with a 100µs filter.

Permanent Temperature Monitoring

16.3.4

The bandgap on DA6021 also implements an over temperature detection. Two temperature ranges are

supervised:



A pre-alarm is issued at about 110°C.



An over-temperature system-shutdown is issued at about 140°C.

If a pre-alarm is detected for a time frame > 100µs (de-bounce time), the PROCHOT_B output gets asserted. If

the pre-alarm is de-asserted for at least 500µs (de-bounce time) PROCHOT_B gets de-asserted. This

guarantees a 500us minimum assertion time of PROCHOT_B.

If asserting PROCHOT_B (the external processor should start throttling which in turn should lead to a decrease

of the temperature due to less power consumption) does not lower the temperature and the temperature reaches

the 140°C limit for at least 100us circa (de-bounce time), DA6021 performers an immediate shutdown (it goes

into SOC_G3 state).

DA6021 Datasheet(PDF) 165 Page - Renesas Technology Corp

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