DA6021 datasheet(176/225 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

176 of 224

www.dialog-semiconductor.com

The system temperature exceeds the critical thermal limit set for the SYSTEMP0-2, and critical

temperature shut down is not enabled (CRIT_EN=0), the following actions are taken:



DA6021 sets SYS*CRIT in THRMIRQ1 to interrupt the SOC.



In response to the IRQ, the SOC should check CRIT_ST in SYS*_THRM_RSH to see if the system

critical over/under temperature condition still exists



When the battery critical over/under temperature event resolves (system thermistor voltages are

back within defined voltage ranges), the SOC clears the SYS*CRIT interrupt.

Battery Critical Temperature

16.4.2

While the temperature threshold registers define the boundaries between different operating temperature alert

levels, the absolute ends of the battery operating temperature are monitored/enforced by two voltage

comparators (one per battery thermistor), comparing these voltages against programmable thresholds which, for

a particular thermistor curve, specify the minimum and maximum battery temperatures.

These ―critical temperature‖ comparators monitor the same thermistor voltages as the ADC channels for the

primary and/or secondary battery. These values (TCRIT_HIGH and TCRIT_LOW) have default values defined.

If the voltage on one or both battery temperature pins falls outside of the TCRIT_HIGH and TCRIT_LOW

thresholds, and critical temperature shut down is enabled (CRIT_EN=1), the following actions are taken:



DA6021 forces the immediate shutdown of all VR rails currently in regulation, returning DA6021 to

the SOC G3 state without depending on the assertion of SLP_S*_B signals from the SOC.



DA6021 sets the RBATTEMP bit in the RESETSRC0 register to indicate the reason for shutdown.



DA6021 sets BATCRIT in THRMIRQ2 to interrupt the SOC. However, the SOC may not have time

to respond before the system is shut down.

If the voltage on one or both battery temperature pins falls outside of the TCRIT_HIGH and TCRIT_LOW

thresholds, and critical temperature shut down is not enabled (CRIT_EN=0), the following actions

are taken:



DA6021 sets BAT*CRIT in THRMIRQ to interrupt the SOC.



In response to the IRQ, the SOC should check CRIT_ST in BAT*_THRM_RSH to see if the battery

critical over/under temperature condition still exists



When the battery critical over/under temperature event resolves (battery thermistor voltages are

back within defined voltage ranges), the SOC clears the BAT*CRIT interrupt.

This protection feature is disabled if the battery is detected to be not present (SBATDET). In order to avoid

spurious tripping of this condition upon battery removal, a 200ms de-bounce is required. If, in that 200ms

window, the battery presence detection logic determines the battery was removed, the thermal event de-bounce

counter ends and no action is taken.

DA6021 die Temperature

16.4.3

DA6021 die temperature monitor exceeds the hard-coded critical thermal limit for the device:



A hardware comparator circuit forces the immediate shutdown of all VR rails currently in regulation,

returning DA6021 to the SOC G3 state without depending on the assertion of SLP_S*_B signals

from the SOC.



DA6021 sets the RPMICTEMP bit in the RESETSRC0 register to indicate the reason for shutdown.

However the ADC will also monitor the DA6021 temperature and have similar critical temperature handling

procedure to that outlined above for the system and battery critical temperature events.

DA6021 Datasheet(PDF) 176 Page - Renesas Technology Corp

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