X3100 Xicor, X3100 Datasheet - Page 16

• Manufacturer Part Number: X3100
• Description: 3 or 4 Cell Li-Ion Battery Protection and Monitor IC
• Manufacturer: Xicor

X3100/X3101 – Preliminary Information
REV 1.1.8 12/10/02
Figure 6. Over-discharge Protection Mode—Event Diagram
Table 22. Over-discharge Protection Mode—Event Diagram Description
Event
[0,1)
(1,2)
[1]
[2]
UVP/OCP
OVP/LMON
RGO
Note 1: If SWEN=0 and V
Note 2: OVP/LMON stays high until the microcontroller writes a “1” to the OVPC bit in the control register. This sets the signal low, which turns on the
Note 3: UVP/OCP stays high until the microcontroller writes a “1” to the UVPC bit in the control register. This sets the signal low, which turns on the
VCC
VCELL
V
The internal over-discharge detection delay timer continues counting for T
Event
UV
discharge FET. The FET cannot be turned on prior to this time.
— Charge FET is ON (OVP/LMON=V
— Discharge FET is ON (UVP/OCP=V
— All cell voltages (VCELL
— The device is in normal operation mode (i.e. not in a protection mode).
— The voltage of one or more of the battery cells (V
— The internal over-discharge detection delay timer begins counting down.
— The device is still in normal operation mode
— The internal over-discharge detection delay timer times out, AND V
— The internal over-discharge sense circuitry switches the discharge FET OFF (UVP/OCP=Vcc).
— The charge FET is switched OFF (OVP/LMON=V
— The device has now entered over-discharge protection mode.
— At the same time, the device enters sleep mode (See section “Voltage Regulator” on page 21).
charge FET. It cannot be turned on prior to this time.
0
CELL
< V
CE
, then OVP/LMON stays high and charging is prohibited.
1
T
UV
1
-VCELL
The Longer of TOV+200ms OR TUV+200ms
2
4
) are above the Over-discharge threshold voltage (V
SS
SS
)
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), and hence battery cells are permitted to discharge.
Over-discharge Protection Mode
Sleep Mode
Event Description
0.7V
CELL
CC
).
), falls below V
Note 1, 2
3
Cell Charge Prohibited if SWCEN=0
AND V
CELL
Characteristics subject to change without notice.
UV
UV
4
.
seconds.
is still below V
CELL
T
UVR
< V
CE
5
UV
Note 3
UV.
).
V
SLR
V
V
0V
V
V
UVR
V
5V
V
SS
CE
CC
CC
SS
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