X3100 View Datasheet(PDF) - Xicor -> Intersil

Part Name

Description

Manufacturer

X3100

3 or 4 Cell Li-Ion Battery Protection and Monitor IC

Xicor -> Intersil 

X3100/X3101 – Preliminary Information

Table 20. Over-charge Protection Mode—Event Diagram Description

Event

Event Description

[0,1)

— Discharge FET is ON (UVP/OCP=VSS).

— Charge FET is ON (OVP/LMON=VSS), and hence battery cells are permitted to receive charge.

— All cell voltages (VCELL-VCELL4) are below the over-charge voltage threshold (VOV).

— The device is in normal operation mode (i.e. not in a protection mode).

[1]

(1,2)

[2]

(2,3)

— The voltage of one or more of the battery cells (VCELL), exceeds VOV.

— The internal over-charge detection delay timer begins counting down.

— The device is still in normal operation mode

The internal over-charge detection delay timer continues counting for TOV seconds.

The internal over-charge detection delay timer times out

AND

VCELL still exceeds VOV.

— Therefore, the internal over-charge sense circuitry switches the charge FET OFF (OVP/LMON=Vcc).

— The device has now entered over-charge protection mode.

While in over-charge protection mode:

— The battery cells are permitted to discharge via the discharge FET, and diode D2 across the charge FET

— The X3100 or X3101 monitors the voltages VCELL1-VCELL4 to determine whether or not they have all fallen

below the “Return from over-charge threshold” (VOVR).

— (It is possible to change the status of UVP/OCP or OVP/LMON using the control register)

— All cell voltages fall below VOVR—The device is now in normal operation mode.

[3]

— The X3100/X3101 automatically switches charge FET=ON (OVP/LMON=Vss)

— The status of the discharge FET remains unaffected.

— Charging of the battery cells can now resume.

REV 1.1.8 12/10/02

www.xicor.com

Characteristics subject to change without notice. 14 of 40

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