SC824 datasheet(23/29 Pages) SEMTECH

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SC824

Applications Information (continued) — Charger Logical State Machine

Transition

Comments

Timer Running (if Enabled)

STAT1 turned on

Initiate Soft-Start

Clear and Hold Timer

STAT1 turned off

Output off

Indicate FAULT on STAT pins

Initiate Soft-Start

Suspend the Timer clock &

resume upon return to CHARGE

Initiate Soft-Start

Start Timer(if Enabled)

STAT1 turned on.

IPRGM

STATIC

PINSHORT

CHECK

MONITOR

START

~IPRGM Static

Pinshort Detected

NTC OK-to-Charge

~(UVLO or POR or

(VIN < VOUT + δ)or

NTC_Disable)

(Timer Disabled AND(IBAT < ITERM)) OR

(Timer Enabled AND Top-Off Timer Expired)

VBAT < VReQ

From Any

State

IPRGM Static

Pinshort Detected

IPRGM Dynamic

Pinshort Detection

VBAT > VReQ

Immediate

NTC Hot or Cold

Timer Fault

Initiate Soft-Start

Start Timer(if Enabled)

STAT1 remains off.

RE-

CHARGE

NTC FAULT

VBAT < VPreQ

CHARGE or

NO_BATTERY States:

BAT output CC/CV

regulator operation

Constant Current

Regulation

IBAT = 20% of IFQ

Constant Current

Regulation

IBAT = IFQ

Constant Voltage

Regulation

VBAT = VCV

IBAT > IFQ

VBAT > VPreQ

Regulation

Pre-Charge

VBAT > VCV

Regulation

DISABLE

UVLO or POR or(VIN < VOUT + δ)

or NTC_Disable (asynchronously)

CHARGE

Timer Fault Signal, from

Timer State Machine

BATTERY

NTC_NoBatt

From Any

State Except

DISABLE&

STATIC_

PINSHORT

NTC_NoBatt

NTC OK-to-Charge

State Comments

Logical

State

Logical

State

Transition

Condition

State Entry Path

State Exit Path

KEY:

Signal to Charger

State Machine

Signal to Charger

State Machine

Signals to and from

Charger State Machine

CHARGE

TIMER

FAULT

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