參數(shù)資料
型號(hào)： ISL9208IRZ
廠商： INTERSIL CORP
元件分類(lèi)： 電源管理
英文描述： Multi-Cell Li-ion Battery Pack OCP/Analog Front End
中文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32
封裝： 5 X 5 MM, ROHS COMPLIANT, PLASTIC, MO-220VHHD-2, QFN-32
文件頁(yè)數(shù)： 21/29頁(yè)
文件大小： 495K
代理商： ISL9208IRZ
21
FN6446.0
February 16, 2007
Turning off the FETs in the event of an over-temperature
condition prevents continued discharge or charge of the cells
when they are over heated. Turning off the cell balancing in
the event of an over-temperature condition prevents damage
to the IC in the event too many cells are being balanced,
causing too much power dissipation in the ISL9208.
In the event of an automatic over-temperature condition, cell
balancing is prevented and FETs are held off until the
temperature drops back below the temperature recovery
threshold. During this temperature shutdown period, the
microcontroller can monitor the internal temperature through
the analog output pin (AO), but any writes to the CFET bit,
DFET bit, or cell balancing bits are ignored
The automatic response to an internal over-temperature is
prevented by setting the DISITSD bit to “1”. The automatic
response to an external over-temperature is prevented by
setting the DISXTSD bit to “1”. In either case, it is important
for the microcontroller to monitor the internal and external
temperature to protect the pack and the electronics in an
over-temperature condition.
Analog Multiplexer Selection
The ISL9208 devices can be used to externally monitor
individual battery cell voltages and temperatures. Each
quantity can be monitored at the analog output pin (AO). The
desired voltage is selected using the I
2
C interface and the
AO3:AO0 bits. See Figure 6.
VOLTAGE MONITORING
Since the voltage on each of the Li-ion Cells are normally
higher than the regulated supply voltage, and since the
voltages on the upper cells is much higher than is tolerated
by a microcontroller, it is necessary to both level shift and
divide the voltage before it can be monitored by the
microcontroller or an external A/D converter. To get into the
voltage range required by the external circuits, the voltage
level shifter divides the cell voltage by 2 and references it to
VSS. Therefore, a Li-ion cell with a voltage of 4.2V becomes
a voltage of 2.1V on the AO pin.
TEMPERATURE MONITORING
The voltage representing the external temperature applied at
the TEMPI terminal is directed to the AO terminal through a
MUX, as selected by the AO control bits (see Figures 5 and
6.) The external temperature voltage is not divided by 2 as
are the cell voltages. Instead it is a direct reflection of the
voltage at the TEMPI pin.
A similar operation occurs when monitoring the internal
temperature through the AO output, except there is no
external “calibration” of the voltage associated with the
internal temperature. For the internal temperature
monitoring, the voltage at the output is linear with respect to
temperature. (See the Operating Specifications for
information about the output voltage at +25°C and the output
slope relative to temperature.).
AO
RGO
TEMP3V
TEMPI
VSS
I
2
C
MUX
I
2
C
TEMP
MONITOR
TEMP FAIL
INDICATOR
FIGURE 5. EXTERNAL TEMPERATURE MONITORING
AND CONTROL
VSS (ON)
R
TMP3ON
AO3:AO0
DECODE
OSC
ATMPOFF
C
D
D
508ms
4ms
TO
μC
XOT
1
R
1ms
DELAY
EXTERNAL
I
EXT TEMP
O
P
R
X
AO
VCELL2
VSS
SCL
SDA
I
2
C
FIGURE 6. ANALOG OUTPUT MONITORING DIAGRAM
REGS
AO3:AO0
DECODE
VCELL1
VCELL6
VC7/VCC
2
LEVEL
SHIFT
LEVEL
SHIFT
LEVEL
SHIFT
LEVEL
SHIFT
TEMPI
INT
TEMP
MUX
EXT TEMP.
MUX
ISL9208
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