ISL94200IRZ Intersil, ISL94200IRZ Datasheet - Page 17

• Manufacturer Part Number: ISL94200IRZ
• Description: IC MULTI LI-ION OC PROT 24-QFN
• Manufacturer: Intersil

Specifications of ISL94200IRZ

• Function: Over/Under Voltage Protection
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 5 V ~ 10 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-VFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

.
Device Description
Design Theory
Instructed by the microcontroller, the ISL94200 performs cell
voltage monitoring operations, overcurrent and short circuit
monitoring with automatic pack shutdown using built-in
selectable time delays, and automatic turn off of the power
FETs in an over-temperature condition. All automatic
functions of the ISL94200 can be turned off and the
microcontroller can manage the operations through
software.
Battery Connection
The ISL94200 supports packs of 5 to 7 series connected
Li-ion cells. Connection guidelines for each cell combination
are shown in Figure 1.
BIT
7
6
5
4
3
2
1
0
FIGURE 1. BATTERY CONNECTION OPTIONS
Note: Multiple cells can be connected in parallel
VCELL7
VCELL6
VCELL5
VCELL4
VCELL3
VCELL2
VCELL1
VSS
7 CELLS
FSETEN
Enable discharge set writes
CHSETEN
Enable charge set writes
DISSETEN
Enable discharge set writes
UFLG3
User Flag 3
UFLG2
User Flag 3
RESERVED
RESERVED
RESERVED
FUNCTION
17
VCELL7
VCELL6
VCELL5
VCELL4
VCELL3
VCELL2
VCELL1
VSS
6 CELLS
When set to “1”, allows writes to the Feature Set register. When set to “0”, prevents writes to the Feature
Set register (Addr: 07H). Default on initial power up is “0”.
When set to “1”, allows writes to the Charge Set register. When set to “0”, prevents writes to the Feature
Set register (Addr: 06H). Default on initial power up is “0”.
When set to “1”, allows writes to the Discharge Set register (Addr: 05H). When set to “0”, prevents writes
to the Feature Set register. Default on initial power up is “0”.
General purpose flag usable by microcontroller software. This bit is battery backed up, even when RGO
turns off.
General purpose flag usable by microcontroller software. This bit is battery backed up, even when RGO
turns off.
Reserved for future expansion.
Reserved for future expansion.
Reserved for future expansion.
TABLE 9. WRITE ENABLE REGISTER (ADDR: 08H)
VCELL7
VCELL6
VCELL5
VCELL4
VCELL3
VCELL2
VCELL1
VSS
5 CELLS
ISL94200
System Power-Up/Power-Down
The ISL94200 powers up when the voltages on V
V
At this time, the ISL94200 wakes up and turns on the RGO
output.
RGO provides a regulated 3.3VDC ±10% voltage at pin
RGO. It does this by using a control voltage on the RGC pin
to drive an external NPN transistor (see Figure 2.) 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
emitter of the NPN transistor is monitored and regulated to
3.3V by the control signal RGC. RGO also powers most of
the ISL94200 internal circuits. A 500Ω resistor is
recommended in the collector of the NPN transistor to
minimize initial current surge when the regulator turns on.
Once powered up, the device remains in a wake up state
until put to sleep by the microcontroller (typically when the
cells drop too low in voltage) or until the V
V
CELL2
CE
CELL3
of greater than 30V (preferably 50V). The voltage at the
DESCRIPTION
, V
, or VCC voltages drop below their POR threshold.
FIGURE 2. VOLTAGE REGULATOR CIRCUITS
CELL3
, and VCC all exceed their POR threshold.
VCC
VSS
RGC
RGO
500
CELL1
, V
3.3V
GND
CELL1
CELL2
July 3, 2008
FN6718.0
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