DA6021 datasheet(131/225 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

131 of 224

www.dialog-semiconductor.com

VDCIN Falling (Disconnection Event)

When the VDCIN level at the comparator becomes lower than the reference voltage (including falling edge

hysteresis), VDCIN is considered invalid. If the VDCINDBEN bit is set in the VDCINDETCTRL register, VDCIN

must be sensed as invalid for the full 100ms de-bounce time before the SDCINDET bit in the SPWRSRCIRQ

immediately upon VDCIN becoming invalid.

On any change in the SDCINDET bit in the SPWRSRCIRQ register (set or clear), the corresponding interrupt

flag, DCINDET, is set in the PWRSRCIRQ 2

nd-level interrupt register. This automatically sets the PWRSRC

interrupt flag in the IRQLVL1 interrupt register, and alerts the SOC. The SOC is expected to query the

SDCINDET bit in SPWRSRCIRQ to determine if the event was a connection or disconnection.

Analog electrical parameters:

Parameter

Symbol

Min

Typ

Max

unit

Val

VDCIN Rising Threshold (VDCIN: L->H)

VDCINREFH

895

940

990

VDCIN Falling Threshold (VDCIN H->L)

VDCINREFL

810

860

900

debouncing

100

110

Table 97: VDCIN Detection, Analog Electrical Parameters

BATLOW Definition

14.5

Once detection is done, according to the supply configuration, the ADC will be triggered to measure the VBAT

voltage. The result register will be compared with one of the four possible threshold levels defined to generate

the BATLOW signal. This is needed in order to decide if we can boot or not. Below a figure with the levels and

the explanation for the different LOWBAT levels

Figure 65: Valid Battery Thresholds



LOWBAT: No supply source detected apart from the main battery.



LOWBATSDP: VBUS_SENSE detected and USB is of the SDP type.



LOWBATDCP: VBUS_SENSE detected and USB is of the DCP, CDP or ACA type.



LOWBATDC: VDCIN_SENSE is detected so an AC adapter is connected.

After every battery measurement the result will be compared with the corresponding thresholds. If the system is

running on AC/DC plug or USB supply the VBAT input voltage is measured frequently with the ADC. If the level

drops below an appropriate threshold the PMIC will assert the BATLOW pin, the processor will then take action.

All thresholds are preprogrammed in OTP and can be overwritten by software.

3.6V

2.0V

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