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6295CV Просмотр технического описания (PDF) - Intersil

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6295CV Low Voltage Fuel Gauge Intersil
Intersil Intersil
6295CV Datasheet PDF : 25 Pages
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ISL6295
1
Cell +
J2
1
Cell -
R1
1K
U2
MM3077DN
5 VDD V- 2
C1
100nF
4
DS COUT
3
6 VSS DOUT 1
RT1
THERMISTOR
t
C2 C3
100nF 1.0nF
R4
221K 0.1%
U1
ISL6295
2 VP
SCL 3
6 NTC
SDA 4
5 ROSC
1 GPAD
7 GND
SR 8
F1
2
3
PLACE THERMAL
FUSE NEXT TO Q1
ON PCB LAYOUT
R2
1K
6
7
Q1
SI6880E DQ
R5
0.020 1%
Note: Connect NTC pin to ground if thermister is not used
FIGURE 1. ISL6295 APPLICATIONS SCHEMATIC
R6
680
R7
680
D1
CMSZDA5V6
J3B+
1
J4 C
1
J5D
1
J6 B
1
Functional Pin Descriptions
GPAD/IO1 (Pin 1)
General purpose A/D input or general purpose input/output
pin. Grounded if not used.
VP (Pin 2)
Cell input connection for the positive terminal of the Li-Ion
cell. Connects to the positive terminal of 1-cell series packs.
VP serves as the power supply input for the ISL6295.
SCL (Pin 3)
SMBus/I2C™ clock line connection
SDA (Pin 4)
SMBus/I2C™ data line connection
ROSC (Pin 5)
External bias resistor. 221k(±0.1%) oscillator reference
setting resistor connected between this pin and GND.
NTC/IO0 (Pin 6)
Connection for an external temperature sensor using a
thermistor. Can also be configured as an open drain general
purpose input/output pin. Grounded if not used.
GND (Pin 7)
Analog and digital ground
SR (Pin 8)
Current measurement A/D input. Connects to the other
terminal of a grounded current sense resistor.
Theory of Operation
The ISL6295 contains a complete analog "front-end" for
battery monitoring as well as digital logic for control,
measurement accumulation, timing, and communications.
Major functions within the ISL6295 include:
• Voltage Regulator
• Precision Time Base
• Temperature Sensor
• 256 Byte NV-EEPROM
• 32 Byte general purpose SRAM
• Analog-to-Digital (A/D) Converter
• 32-bit Accumulators/Timers
• SMBus/I2C™ Communications Interface
Figure 2 is a block diagram of the internal circuitry of the
ISL6295. Figure 1 is a schematic diagram that depicts the
ISL6295 in a typical single cell Lithium-ion application. The
function of each of the blocks listed above is summarized in
the following sections.
4
FN9074.0
October 25, 2005
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