X3101V28 Intersil, X3101V28 Datasheet - Page 21

• Manufacturer Part Number: X3101V28
• Description: IC PROTECT/MONITOR 3CELL 28TSSOP
• Manufacturer: Intersil

Specifications of X3101V28

• Function: Battery Monitor
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 6 V ~ 24 V
• Operating Temperature: -20°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 28-TSSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Table 24. Over-Current Protection Mode—Event Diagram Description
MONITOR MODE
Analog Multiplexer Selection
The X3100 and X3101 can be used to externally monitor
individual battery cell voltages, and battery current. Each
quantity can be monitored at the analog output pin (AO),
and is selected using the analog select (AS0 - AS2) pins
(Table 25). Also, see Figure 7.
Table 25. AO Selection Map
Current Monitor Function
The voltages monitored at pins VCS
used to calculate current flowing through the battery
terminals, using an off-board microcontroller with an A/D.
Notes: (1) This is the normal state of the X3100 or X3101. While
AS2 AS1 AS0
Event
H
H
H
H
L
L
L
L
(3,4)
[3]
[4]
(2) VCS
H
H
H
H
L
L
L
L
in this state Over-charge and Over-discharge Protec-
tion conditions are periodically monitored (See “Peri-
odic Protection Monitoring” on page 13.)
voltage of 2.5V (See section “Current Monitor Func-
tion” on page 21).
— The device detects the load resistance has risen above R
— Voltages P+ and VCS
— The test current from pin OVP/LMON is stopped (I
— The device has now returned from the load monitor state
— The internal over-current release time timer begins counting down.
— Device is still in over-current protection mode.
— The internal over-current release timer times out, and VCS
— The device returns from over-current protection mode, and is now in normal operation mode.
— The discharge FET is automatically switched ON (UVP/OCP = Vss)—unless the status of UVPC has been
— The status of the charge FET remains unaffected.
— Discharge of the battery cells is once again possible.
1
, VCS
H
H
H
H
L
L
L
L
changed in the control register during the over-current protection mode.
2
V
VCELL
VCELL
VCELL
VCELL
VCS
VCS2 - VCS
V
are read at AO with respect to a DC bias
SS
SS
(1)
1
21
- VCS
The internal over-current release timer continues counting for T
1
2
3
4
- VCELL
- VCELL
- VCELL
- Vss (VCELL
AO output
2
1
(VCS
(VCS
1
21
2
3
4
and VCS
(VCELL
(VCELL
(VCELL
12
return to their normal levels.
21
)
)
(2)
4
(2)
)
12
23
34
2
can be
)
)
)
X3100, X3101
Event Description
Since the value of the sense resistor (R
(typically in the order of tens of m
resolution of various A/D converters may vary, the
voltage across R
internally with a gain of between 10 and 160, and out-
put to pin AO (Figure 7).
Figure 7. X3100/X3101 Monitor Circuit
LMON
= 0µA)
OCR
VCS
21
is still below V
1
.
(Continued)
Voltage
Shifters
R
Level
R1
SENSE
R2
SENSE
R1
VCS
2.5V
Register
Cross-Bar
Config
Switch
2
Cell 1 Voltage
Cell 2 Voltage
Cell 3 Voltage
Cell 4 Voltage
CSG1 CSG0
( VCS
OCR
OC.
+
-
seconds.
OP1
R2
Setting
1
Gain
and VCS
X3100/X3101
Over-Current
Protection
Ω
),
SENSE
and since the
2
SPI
I/F
) is amplified
January 3, 2008
) is small
FN8110.1
S0
SCL
CS
SI
AS0
AS1
AS2
AO
P-