RT5002 datasheet(34/40 Pages) RICHTEK

34 / 40 page

RT5002

DS5002-00

November 2011

www.richtek.com

RT5002 Operation State Diagram for Charging

Operation State Diagram for TS Pin (TSSEL = L)

Any State

74% x VVP < VTS < 2.85V

Or VTS < 28% x VVP

Yes

TS fault State

ICHG = 0A

TS_FAULT = 1

VTS > 2.85V

Yes

Battery Remove State

ICHG = 0A

Reset timer and NoBAT = 1

Any State

or VIN < VUVLO,

or VIN > VOVP,

Or VIN - VBAT < VOS_H

or USUS = 1

or ENCH = 1

Charger

Disable

Standby State

Sleep State

VIN – VBAT

> VOS_H

VBAT > 3V

Pre-Charge State

ICHG_PRE =

10% x ICHG_FAST

Time > tPCHG

Fast-Charge State

If ISET = 1

ICHG_FAST = (VISETA / RISETA) x 300

If ISET = 0

ICHG_FAST = (VISETA / RISETA) x 150

If VSET = 1

Check VBAT > 4.1V

If VSET = 0

Check VBAT > 3.95V

Time > tTERMI = 25msec

Charge Done State

EOC = 1 & ICHG = 0A

If VSET = 1

Check VBAT < 4.1V

If VSET = 0

Check VBAT < 3.95V

Re-Charge State

Timer-Out State

SAFE = 1

& ICHG to 1mA

Time > tFCHG

VUVLO< VIN < VOVP

& ENCH = 0

& USUS = 0

Yes

ISETL = 0 & ISETU = 1

ISETL = 1 & ISETU = X

Check ICHG < 10% x ICHG_FAST

If ISETL = 0 & ISETU = 0

Check ICHG < 3.3% x ICHG_FAST

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