參數(shù)資料
型號(hào)： ISL9217IRZ
廠商： INTERSIL CORP
元件分類： 電源管理
英文描述： 8 to 12 Cell Li-Ion Battery Overcurrent Protection and Analog Front End Chip Set
中文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24
封裝： 4 X 4 MM, ROHS COMPLIANT, PLASTIC, QFN-24
文件頁數(shù)： 21/33頁
文件大?。?/td> 645K
代理商： ISL9217IRZ
21
FN6488.1
November 2, 2007
Device Description
Design Theory
Instructed by the microcontroller, the ISL9216 and ISL9217
chip set performs cell voltage monitoring and cell balancing
operations. The ISL9216 has automatic overcurrent and
short circuit monitoring, and shut-down with built-in
selectable time delays. The ISL9216 also provides automatic
turn off of the power FETs and cell balancing FETs in an
over-temperature condition. All automatic functions of the
ISL9216 can be turned off and the microcontroller can
manage the operations through software.
Battery Connection
The ISL9216 and ISL9217 support packs of 8 to 12 series
connected Li-ion cells. Connection guidelines for each cell
combination are shown in Figure 1.
System Power-Up/Power-Down
The ISL9216 and ISL9217 power-up when the voltages on
their VCELL1, VCELL2, VCELL3, and VCC pins all exceed
their POR threshold. At this time, the devices each wake-up
and turn on their RGO output.
The regulator circuit provides 3.3VDC at pin RGO. It does
this by using a control voltage on the RGC pin to drive an
external NPN transistor (See Figure 2). For the ISL9216, the
transistor should have a beta of at least 70 to provide ample
current to the device and external circuits and should have a
V
CE
of greater than 60V (preferably higher) for a 12 cell
pack. For the ISL9217, the transistor selection is not as
critical because it will likely not drive any external circuits,
however, it should be rated with a V
CE
greater than 50V.
The voltage at the emitter of the NPN transistor is monitored
and regulated to 3.3V by the control signal RGC. RGO also
powers most of the ISL9216 and ISL9217 internal circuits. A
500
Ω
resistor is recommended in the collector of each NPN
transistor to minimize initial current surge when the regulator
turns on.
Once powered up, the devices remain in a wake-up state
until put to sleep by the microcontroller (typically when the
cells drop too low in voltage) or until the VCELL1, VCELL2,
VCELL3, or VCC voltages drop below their POR threshold.
WKUP Pin Operation
There are two ways to design a wake-up of the ISL9216. In
an active LOW connection (WKPOL = ’0’ - default), the
device wakes up when a charger is connected to the pack.
This pulls the WKUP pin low when compared to a reference
based on the VCELL1 voltage. In an active HIGH connection
(WKPOL = ‘1’) the device wakes up when then WKUP pin is
pulled high by a connection through an external switch. See
Figure 3.
Once the ISL9216 wakes up, the RGO powers up the
microcontroller. The microcontroller then wakes up the
ISL9217 by setting the WKUPR bit in the ISL9216. The
WKUPR pin of the ISL9216 connects to the ISL9217 WKUP
pin. When the ISL9216 WKUPR bit is set to “1”, the ISL9217
WKUP pin pulls low and the ISL9217 wakes up. Because of
this operation, it is important that the WKPOL bit of the
ISL9217 remain in the default state (ISL9217 WKPOL = 0).
Protection Functions
In the default, recommended condition, the ISL9216
automatically responds to discharge overcurrent, discharge
short circuit, charge overcurrent, internal over-temperature,
and external over-temperature. The designer can set
optional over-ride conditions that allow the response to be
dictated by the microcontroller. These are discussed in the
following section.
RGC
RGO
VSS
VCC
FIGURE 2. VOLTAGE REGULATOR CIRCUITS
RGC
RGO
VSS
VCC
3.3V
GND
500
500
ISL9216
FIGURE 3. WAKE-UP CONTROL CIRCUITS
VSS
330k*
* INTERNAL RESISTOR
ONLY CONNECTED WHEN
WKPOL = 1.
5V
WKUP
WKPOL
(CONTROL)
WKUP
(STATUS)
WAKE-UP
CIRCUITS
ISL9216, ISL9217
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