CDH2D09 datasheet(30/44 Pages) MAXIM

30 / 44 page

PMIC with Integrated Charger and

Smart Power Selector for Handheld Devices

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Charge Status Outputs (CST1, CST2)

CST1 and CST2 are open-drain charger status outputs.

Their function is shown in Table 3 and Figure 7. When

the MAX8671X is used with a µP, pull CST1 and CST2

up to the system logic voltage with resistors to indicate

charge status to the µP. Alternatively, CST1 and CST2

sink up to 20mA each for LED charge indicators.

If the charge status output feature is not required, connect

CST1 and CST2 to ground or leave them unconnected.

CHARGER DISABLED

CST[1:2] = 11

UOK AND/OR DOK = 1

ICHG = 0mA

TIMER FAULT

CST [1:2] = 10

ICHG = 0mA

UOK AND/OR DOK = 1

TIMER EXTEND

CST [1:2] = 00

(ISET x 20%) < ICHG < (ICHGMAX x 50%)

THERMISTOR SUSPEND

ICHG = 0mA

CST[1:2] = 01

UOK AND/OR DOK = 1

THERMISTOR SUSPEND

ICHG = 0mA

CST[1:2] = 01

UOK AND/OR DOK = 1

THERMISTOR SUSPEND

ICHG = 0mA

CST[1:2] = 01

UOK AND/OR DOK = 1

ICHGMAX =

1.5V

RCISET

PREQUALIFICATION

CST[1:2] = 00

UOK AND/OR DOK = 1

ICHG = ICHGMAX/10

TOP-OFF

CST[1:2] = 11

UOK AND/OR DOK = 1

VBAT = VBATREG

DONE

CST[1:2] = 11

UOK AND/OR DOK = 1

(VBATREG + VBATRCHG) < VBAT

≤ VBATREG

ICHG = 0mA

FAST-CHARGE

CST[1:2] = 00

UOK AND/OR DOK = 1

NO INPUT POWER

CST [1:2] = 11

UOK = 0, DOK = 0

ICHG = 0mA

t > tPREQUAL

VBAT > 3.0V

IC SETS TIMER = 0

VBAT < 2.82V

IC SETS TIMER = 0

ICHG < ICHGMAX x 53%

OR VBAT = VBATREG

IC RESUMES TIMER

ICHG < ICHGMAX x 4%

AND VBAT = 4.2V

IC SETS TIMER = 0

ICHG > ICHGMAX x 7%

IC SETS TIMER = 0

CEN = 0

USUS = 0

IC SETS TIMER = 0

t > tFST-CHG

ICHG < ICHGMAX x 50%

AND VBAT < VBATREG

IC EXTENDS TIMER BY 2x

VBAT <

(VBATREG + VBATRCHG)

IC SETS TIMER = 0

t > 15s

THM OUT OF RANGE

THM WITHIN RANGE

IC RESUMES TIMER

THM OUT OF RANGE

IC SUSPENDS TIMER

CEN = 1

USUS = 1

USB AND DC = INVALID

USB AND/OR DC = INVALID

2000

ANY STATE

TIMER SUSPEND

CST [1:2] = 00

ICHG < (ICHGMAX x 20%)

ICHG < ICHGMAX x 23%

AND VBAT = VBATREG

IC RESUMES TIMER

ICHG < ICHGMAX x 20%

AND VBAT < VBATREG

IC SUSPENDS TIMER

t > 15s

THM WITHIN RANGE

IC RESUMES TIMER

THM OUT OF RANGE

IC SUSPENDS TIMER

Figure 7. Charger State Diagram

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