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| 型号： | ISL9217IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 21/33页 |
| 文件大小： | 0K |
| 描述： | IC MULTI-CELL LI-ION PROT 24-QFN |
| 标准包装： | 6,000 |
| 功能： | 电池监控器 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 9.2 V ~ 31 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VFQFN 裸露焊盘 |
| 供应商设备封装： | 24-QFN 裸露焊盘（4x4） |
| 包装： | 带卷 (TR) |
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ISL9216, ISL9217
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
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.
combination are shown in Figure 1.
VCC
500
500
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
RGC
RGO
VSS
VCC
RGC
V CE of greater than 60V (preferably higher) for a 12 cell
pack. For the ISL9217, the transistor selection is not as
RGO
3.3V
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.
VSS
FIGURE 2. VOLTAGE REGULATOR CIRCUITS
ISL9216
WKUP
GND
WKUP Pin Operation
WKUP
(STATUS)
5V
There are two ways to design a wake-up of the ISL9216. In
an active LOW connection (WKPOL = ’0’ - default), the
WAKE-UP
330k*
device wakes up when a charger is connected to the pack.
CIRCUITS
WKPOL
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
21
(CONTROL)
VSS
* INTERNAL RESISTOR
ONLY CONNECTED WHEN
WKPOL = 1.
FIGURE 3. WAKE-UP CONTROL CIRCUITS
FN6488.1
November 2, 2007
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