Maximum Junction Temperature (Plastic Package) . . . . . . . . 120°C
Maximum Storage Temperature Range . . . . . . . . . . . -35°C to 120°C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300°C
CAUTION: Stress above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational section of this specification is not implied.
NOTE:
1.
θ
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
Electrical Specifications
PARAMETER
DC CHARACTERISTICS
Supply Voltage
Typical Values Are Tested at V
P
= 5V and ambient temperature is at 25°C, All Maximum and Minimum Values
Are Guaranteed Under the Recommended Operating Conditions., Unless Otherwise Noted.
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
V
P
For SMBus and register access
For EEPROM write
For guaranteed analog parametrics
2.8
3.3
3.0
85
45
20
400
7.0
7.0
7.0
120
85
40
800
0.6
V
V
V
μA
μA
μA
nA
V
V
Supply Current Run Mode
Supply Current Sample Mode
Supply Current Sample - Sleep Mode
Supply Current Shelf Sleep Mode
Input Low Voltage IO0, IO1
Input High Voltage IO0, IO1
GPIO Input Low Current Pull-up mode
Leakage Current IO pin programmed
as outputs or inputs without pullup
Output low voltage for IO0, IO1
Output high voltage for IO0 configured
as push-pull
Thermistor Output Current
Input Low Voltage for SMBus pins
Input High Voltage for SMBus pins
Output Low Voltage for SMBus pins
Output High Voltage for SMBus pins
Input leakage current SMBus pins
IDD
IDDINS
IDDSLP
IDDSSLP
VIL
VIH
IIL-IO0PU
IL-IO
VOL-IO
VOH-IO
INTC
VIL-SMB
VIH-SMB
VOL-SMB
VOH-SMB
ILEAK-SMB
A/D Active (Note 1)
A/D Inactive (Notes 1, 2)
Sample -Sleep Mode (Note 1)
Shelf Sleep Mode (Note 1)
2.4
7
1
IOL = 0.5mA
IOH = 100μA
ROSC = 221kΩ ± 0.1%
2.1
8
13
16
0.8
2.0
IPULLUP = 4mA
(Note 3)
2.1
-5.0
5.5
0.4
5.5
+5.0
600
0.4
μA
nA
V
V
μA
V
V
V
V
μA
AC CHARACTERISTICS
(T
A
= -20°C to +85°C; V
P
= 3.0V to 7.0V; ROSC = 221kΩ ± 0.1%)
Internal main oscillator frequency
Internal auxiliary oscillator frequency
Accumulator Time Base Accuracy
(internal 2Hz clock)
fRC
fAUX
fACC
During Run and Sample mode
(Note 3)
During Sample-Sleep mode (Note 3)
Internal A/D operating clock
Power-on-Reset Threshold
Delay to entry of Shelf-Sleep mode
fA/D
VPOR
tSHELF
(Note 3)
Voltage at VP
(Shent = 1 or VP < VPtrip) and (SDA
and SCL go low)
2.4
10
ROSC = 221kΩ ± 0.1%
130.8
118
-0.6
-10
f
RC
/4
2.75
131.5
131
132.2
144
+0.6
+10
kHz
kHz
%
%
kHz
V
ms
2
FN9074.2
February 8, 2011
ISL6295
Electrical Specifications
PARAMETER
Typical Values Are Tested at V
P
= 5V and ambient temperature is at 25°C, All Maximum and Minimum Values
Are Guaranteed Under the Recommended Operating Conditions., Unless Otherwise Noted.
(Continued)
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
A/D CONVERTER CHARACTERISTICS
(T
A
= -20°C to +85°C; V
P
= 3.0V to 7.0V, Note 3, 4)
A/D Converter Resolution
A/D Conversion Measurement Time
A/D Converter Input Voltage Range
(internal)
Internal Temperature Accuracy
Calibrated Voltage Measurement
Gain Error
Calibrated Current Measurement
Gain Error (with ideal ZTC current
sense resistor)
Calibrated Temperature Measurement
Gain Error (internal sensor)
Calibrated ADC Offset Error
N
tconv
VADIN
Magnitude only (Note 5)
N-bit + sign
Differential
Single-Ended
T
ACC
EVGAIN
Max deviation over supply voltage
and temperature range (assumed
ideal under the calibration condition)
Max deviation over supply voltage
and temperature range (assumed
ideal under the calibration condition)
Max deviation over supply voltage
and temperature range (assumed
ideal under the calibration condition)
Max deviation over supply voltage
and temperature range (assumed
ideal under the calibration condition)
V
REF
= 170mV
V
REF
= 340mV
Integrated Nonlinearity Error
NOTES:
1. Does not include current consumption due to external loading on pins. No EEPROM access.
2. Sample mode current is specified during an A/D inactive cycle. Sample mode average current can be calculated using the formula: Average
Sample Mode Supply Current = (IDDRUN + (n-1)*IDDINS)/Ns; where Ns is the programmed sample rate.
3. Guaranteed by characterization or correlation to other test.
4. The max calibrated gain and offset errors are based on a 15-bit calibration procedure to generate the calibration factors. These calibration
factors are then applied to correct the ADC results.
5. Voltage is internal at A/D converter inputs. VSR is measured directly. VP and GPAD inputs are measured using internal level-translation circuitry
that scales the input voltage range appropriately for the converter.
EINL
0.30
0.15
0.01
%
%
%
-152
0
-3
8
2
(N+1)
/f
A/D
+152
309
3
0.60
15
bits
s
mV
mV
°K
%
EIGAIN
0.50
%
ETEMP
0.60
%
EVOFFSET
3
FN9074.2
February 8, 2011
ISL6295
1
Cell +
R1
1K
5
C1
100nF
4
6
U2
MM3077DN
VDD
DS
V-
COUT
2
3
1
C3
C2
100nF 1.0nF
R4
221K 0.1%
4
5
R2
1K
6
7
Q1
SI6880EDQ
R5
0.020 1%
5
1
7
t
RT1
THERMISTOR
2
6
VSS DOUT
U1
ISL6295
VP
NTC
ROSC
GPAD
GND
SR
8
CELL CONNECTION
J3B+
1
SCL
SDA
3
4
R7
680
D1
CMSZDA5V6
R6
680
J4 C
1
J5D
1
J6 B
1
J2
1
Cell -
F1
2
3
1
8
PLACE THERMAL
FUSE NEXT TO Q1
ON PCB LAYOUT
Note: Connect NTC pin to ground if thermister is not used
FIGURE 1. ISL6295 APPLICATIONS SCHEMATIC
Functional Pin Descriptions
GPAD/IO1 (Pin 1)
General purpose A/D input or general purpose input/output
pin. Grounded if not used.
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/I
2
C™ 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.
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.
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