ADC 6021 Spécifications télécharger pdf (Page 87)

MYXPM6021*

Revision 1.1 - 10/21/14

*Advanced information. Subject to change without notice.

MYXPM6021*

Form #: CSI-D-685 Document 011

16 External Battery Charger Control

16.1 Overview

ThePMIChastheabilitytocontrolanexternalbatterychargerIC.Inordertodeterminetheappropriateinputcurrentlimit

forthechargerduringcertainscenarios,theCHGDET_Bpinisassertedorde-assertedbytheUSBPHYontheplatform

dependingonoutputcurrentcapabilityoftheUSBchargerdetected.

ILIM0andILIM1pinsofMYXPM6021willoutputsignalstothechargertosetthechargerinputcurrentlimit.Theexternal

chargeriscapableofgeneratinganinterruptwhichwillbeforwardedtotheSoCviaMYXPM6021.Thisinterruptwillcome

fromtheCHGRINT_Bpin.Duringchargingthebatterytemperaturewillbemonitored.

16.2 Charger Current Limit

Theexternalchargerinputcurrentlimitsaresetaccordingtothetablebelow.

Table 54: External Charger Current Limits

CHRDET_B ILIM1 ILIM0 Power Source Input Current Limit

1 0 0 USB DCP More than 100mA, usually 1.5A

1 0 1 USB SDP 100mA

1 1 1 USB SDP 500mA

X 1 0 AC/DC Adapter Customer specic, limited by max

charger output current

TheAC/DCadapterusuallytakespriorityovertheUSBchargerasinputpowertotheexternalbatterycharger.However,

MYXPM6021detectstheAC/DCadapterbymonitoringVDCIN_SENSE.MYXPM6021changesILIM0andILIM1level

immediatelyVDCIN_SENSEfallbelowtheinternalvoltagereferencethresholdtoinformtheexternalchargertolowerits

currentlimitattheremovalofAC/DCadapter.

Table 55: Charger Control Pins

Name Dir Voltage Signal Description

CHGRINT_B I VSYS Battery charging status and fault interrupt from

charger IC, active low. Internal 10kOhm pull-up to VSYS.

0=interrupt, asserted with a minimum pulse width of 200μs

ILIM[1:0] O VSYS External charger input current limits

CHGDET_B I VUSBPHY USB DCP detection. Asserted by USBPHY when it detected a

charger that can source more than 100mA

Internal 100kOhm pull-up to VSYS

1=SDP detected

0=DCP or CDP/ACA

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ADC 6021 Spécifications Page 87