Apple Battery Charger User Manual download pdf (Page 15)

15Maxim Integrated

USB Battery Charger Detectors

MAX14578E/MAX14578AE

Figure 1. Charger-Type-Detection Sequence

Figure 2. Charger-Detection Timing

t

MDEB

V

B

DCD START

ENABLE

COMPARATORS

LOUT ENABLE (MAX14578AE)

(SFOUTASRT = 0)

CHGRUN

V

VBDET

DCD PASS D+/D- SHORT DEDICATED CHARGER

CHG_TYP = 011

ENABLE CHARGING DOWNSTREAM

PORT DETECTION

ENABLE STANDARD DOWNSTREAM

PORT DETECTION

t

MDEB

t

MDEB

t

MDEB

t

DP_SRC_ON

CHARGER CONFIGURATION

(USB SWITCH CLOSED)

CONFIGURE CE_

SPECIAL CHARGER

SONY CHARGER TEST

APPLE CHARGER TEST

DCP/CDP TEST

DCD

BEGIN DCD TEST

D+/D- SHORT TEST

DORMANT

CE_ = HI-Z

V

B

< V

VBDET

V

B

< V

VBDET

() MAX14578AE ONLY.

V

B

< V

VBDET

MAX14578E: USB_CHGDET = 1

MAX14578AE: V

EN

= 0V

NOT DCD COMPLIANTDCD COMPLIANT

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