L6924D datasheet(21/38 Pages) STMICROELECTRONICS

No. de pieza	L6924D

Descripción Electrónicos	Battery charger system with integrated power switch for Li-ION/Li-POLYMER

PDF	38 Pages

Scroll/Zoom	100%

Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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21 / 38 page

L6924D

Applications information: charging process

21/38

7.6

Recharge flow chart

Figure 15. Recharge flow chart

7.7

Recharge threshold

When, from an End-of-Charge condition, the battery voltage goes lower than the recharging

threshold (VRCH), the device goes back in charging state. The value of the recharge threshold

is VOPRG–150mV.

END of CHARGE

VBAT

VRCH

Detect Low

VBAT

VPRETH

FAST CHARGE

Detect High

VBAT

VRCH

BATTERY

ABSENT

PRE CHARGE

FAULT

IND FAULT

VBAT

VRCH

Detect High Fault

VBAT

VABS

Detect Low Fault

VBAT

VPRETH

BATTERY

ABSENT

YES

DETECT LOW = a ISINK is sunk for a TDET from the battery

DETECT HIGH = a IINJ is injected for a TDET in the battery

DETECT LOW FAULT = a ISINK is sunk for a TDET from the battery

DETECT HIGH FAULT = a IINJ is injected for a TDET in the battery

VABS = VOPRG – 50mV

VRCH = VOPRG – 150mV

TDET = 100ms (Typ.)

ISINK = IINJ = 1mA (Typ.)

RETURN TO CHARGING PROCESS

FLOW CHART

GO TO BATTERY ABSENT

FLOW CHART

FROM CHARGING PROCESS FLOW CHART

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