LTC1392CS8#PBF [Linear]
LTC1392 - Micropower Temperature, Power Supply and Differential Voltage Monitor; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C;型号: | LTC1392CS8#PBF |
厂家: | Linear |
描述: | LTC1392 - Micropower Temperature, Power Supply and Differential Voltage Monitor; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C 光电二极管 监控 |
文件: | 总12页 (文件大小:287K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LTC1392
MicropowerTemperature,
Power Supply and
DifferentialVoltageMonitor
U
DESCRIPTIO
EATURE
S
F
The LTC®1392 is a micropower data acquisition system
designed to measure temperature, on-chip supply voltage
and a differential voltage. The differential inputs feature
rail-to-railcommonmodeinputvoltagerange.TheLTC1392
containsatemperaturesensor,a10-bitA/Dconverterwith
sample-and-hold, a high accuracy bandgap reference and
a 3-wire half-duplex serial interface.
■
■
■
Complete Ambient Temperature Sensor Onboard
System Power Supply Monitor
10-Bit Resolution Rail-to-Rail Common-Mode
Differential Voltage Input
Available in 8-Pin SO and PDIP
0.2µA Supply Current When Idle
700µA Supply Current When Sampling at
Maximum Rate
Single Supply Voltage: 4.5V to 6V
3-Wire Half-Duplex Serial I/O
Communicates with Most MPU Serial Ports and All
■
■
■
The LTC1392 can be programmed to measure ambient
temperature, power supply voltage and an external volt-
age at the differential input pins, that can also be used for
current measurement using an external sense resistor.
When measuring temperature, the output code of the A/D
converter is linearly proportional to the temperature in °C.
Production trimming achieves ±2°C initial accuracy at
room temperature and ±4°C over the full –40°C to 85°C
temperature range.
■
■
■
MPU Parallel I/O O PoU rts
PPLICATI
S
A
■
■
■
■
■
Temperature Measurement
Power Supply Measurement
Current Measurement
Remote Data Acquisition
Environment Monitoring
The on-chip serial port allows efficient data transfer to a
wide range of MPUs over three or four wires. This,
coupled with low power consumption, makes remote
location sensing possible and facilitates transmitting
data through isolation barriers.
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
O
TYPICAL APPLICATI
Output Temperature Error
Complete Temperature, Supply Voltage and
Supply Current Monitor
5
LTC1392C
GUARANTEED
4
LIMIT
1µF
5V
3
+
LTC1392I
GUARANTEED
LIMIT
2
1
LTC1392
TYPICAL
1
2
3
4
8
7
6
5
0
P1.4
D
D
V
CC
IN
R
SENSE
MPU
–1
–2
–3
–4
–5
–V
+V
OUT
IN
IN
(e.g., 68HC11)
P1.3
I
CLK
CS
LOAD
P1.2
GND
LTC1392 • TA01
–40
0
20
40
60
80 100
–20
TEMPERATURE (°C)
LTC1392 • TA02
1
LTC1392
W W W
U
/O
ABSOLUTE AXI U RATI GS
PACKAGE RDER I FOR ATIO
(Note 1)
ORDER PART
Supply Voltage (VCC) ................................................ 7V
Input Voltage ................................. –0.3V to VCC + 0.3V
Output Voltage............................... –0.3V to VCC + 0.3V
Operating Temperature Range
LTC1392C............................................... 0°C to 70°C
LTC1392I........................................... –40°C to 85°C
Junction Temperature.......................................... 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
TOP VIEW
NUMBER
D
1
2
3
4
V
CC
8
7
6
5
IN
LTC1392CN8
LTC1392CS8
LTC1392IN8
LTC1392IS8
D
–V
+V
OUT
IN
CLK
CS
IN
GND
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
S8 PART MARKING
TJMAX = 125°C, θJA = 100°C/ W (N8)
TJMAX = 125°C, θJA = 130°C/ W (S8)
1392
1392I
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS (Note 2, 3)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Power Supply To Digital Conversion
Resolution
V
V
= 4.5V to 6V
= 4.5V to 6V
10
Bit
CC
CC
Total Absolute Error
●
±8
LSB
Differential Voltage to Digital
Conversion (Full-Scale Input = 1V)
Resolution
10
±1
Bit
LSB
LSB
LSB
LSB
Integral Linearity Error (Note 5)
Differential Linearity Error
Offset Error
●
●
●
●
±0.5
±0.5
±1
±4
Full-Scale Error
±15
Differential Voltage to Digital
Conversion (Full-Scale Input = 0.5V)
Resolution
10
±2
Bit
LSB
LSB
LSB
LSB
Integral Linearity Error (Note 5)
Differential Linearity Error
Offset Error
●
●
●
●
±0.5
±0.5
±1
±8
Full-Scale Error
±25
Temperature to Digital Conversion
Accuracy
T = 25°C (Note 7)
±2
±4
°C
°C
A
T = T
or T
(Note 7)
●
A
MAX
MIN
Nonlinearity
T
≤ T ≤ T
(Note 4)
±1
°C
MIN
A
MAX
2
LTC1392
ELECTRICAL CHARACTERISTICS
(Note 2, 3)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
±1
UNITS
µA
µA
V
I
I
On-Channel Leakage Current (Note 6)
Off-Channel Leakage Current (Note 6)
High Level Input Voltage
Low Level Input Voltage
High Level Input Current
Low Level Input Current
High Level Output Voltage
●
●
●
●
●
●
●
ON LEAKAGE
OFF LEAKAGE
±1
V
V
V
V
V
V
= 5.25V
= 4.75V
2
IH
IL
CC
CC
IN
0.8
5
V
I
I
= V
µA
µA
IH
IL
CC
= 0V
–5
IN
V
V
V
= 4.75V, I
= 4.75V, I
= 10µA
= 360µA
4.5
2.4
4.74
4.72
V
V
OH
CC
CC
OUT
OUT
V
Low Level Output Voltage
Hi-Z Output Current
Output Source Current
Output Sink Current
Supply Current
V
= 4.75V, I
= 1.6mA
●
●
0.4
V
µA
OL
CC
OUT
I
I
I
I
CS = High
±5
OZ
V
V
= 0V
–25
45
mA
mA
SOURCE
SINK
CC
OUT
OUT
= V
CC
CS = High
CS = Low, V = 5V
●
●
0.1
0.7
5
1
µA
mA
CC
t
t
t
t
t
t
t
t
Analog Input Sample Time
Conversion Time
See Figure 1
See Figure 1
1.5
10
CLK Cycles
SMPL
CONV
dDO
en
CLK Cycles
Delay Time, CLK↓ to D
Delay Time, CLK↓ to D
Data Valid
Data Enabled
Hi-Z
C
C
= 100pF
= 100pF
●
●
●
150
60
300
150
450
ns
ns
ns
ns
ns
ns
OUT
OUT
OUT
LOAD
LOAD
Delay Time, CS ↑ to D
170
30
dis
Time Output Data Remains Valid After CLK↓
C
C
C
= 100pF
= 100pF
= 100pF
hDO
f
LOAD
LOAD
LOAD
D
D
Fall Time
●
●
70
250
100
OUT
OUT
Rise Time
25
r
C
Input Capacitance
Analog Input On-Channel
Analog Input Off-Channel
30
5
pF
pF
IN
5
pF
W W U
U Digital Input
U
U
RECOM ENDED OPERATING CONDITIONS
SYMBOL
PARAMETER
CONDITIONS
MIN
4.5
TYP
MAX
6
UNITS
V
V
Supply Voltage
Clock Frequency
Total Cycle Time
CC
CLK
CYC
f
t
V
= 5V
150
250
350
kHz
CC
f
= 250kHz
74
144
µs
µs
CLK
Temperature Conversion Only
t
t
t
Hold Time, D After CLK↑
V
V
V
= 5V
= 5V
= 5V
150
2
ns
hDI
IN
CC
CC
CC
Setup Time CS↓ Before First CLK↑ (See Figure 1)
Wakeup Time CS↓ Before Start Bit↑ (See Figure 1)
µs
suCS
10
80
µs
µs
WAKEUP
Temperature Conversion Only
t
t
t
t
t
Setup Time, D Stable Before CLK↑
V
V
V
V
V
= 5V
150
1.6
2
ns
µs
µs
µs
suDI
IN
CC
CC
CC
CC
CC
Clock High Time
= 5V
WHCLK
WLCLK
WHCS
WLCS
Clock Low Time
= 5V
CS High Time Between Data Transfer Cycles
CS Low Time During Data Transfer
= 5V, f
= 250kHz
= 250kHz
2
CLK
CLK
= 5V, f
72
142
µs
µs
Temperature Conversion Only
3
LTC1392
W W U
U
U
U
RECOM ENDED OPERATING CONDITIONS
The
●
denotes specifications which apply over the operating temperature
Note 4: Temperature integral nonlinearity is defined as the deviation of the
A/D code versus temperature curve from the best-fit straight line over the
device’s rated temperature range.
range (0°C ≤ T ≤ 70°C for commercial grade and –40°C ≤ T ≤ 85°C for
A
A
industrial grade).
Note 1: Absolute maximum ratings are those values beyond which the life
of the device may be impaired.
Note 2: All voltage values are with respect to GND.
Note 5: Voltage integral nonlinearity is defined as the deviation of a code
from a straight line passing through the actual end points of the transfer
curve.
Note 6: Channel leakage current is measured after the channel selection.
Note 3: Testing done at V = 5V, CLK = 250kHz and T = 25°C unless
CC
A
otherwise specified.
Note 7: See guaranteed temperature limit curves vs temperature range on
the first page of this data sheet.
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Differential Nonlinearity
Power Supply Voltage Mode
Integral Nonlinearity
Power Supply Voltage Mode
Differential Nonlinearity
1.0
0.5
0
1.0
0.5
0
1.0
0.5
0
f
= 250kHz
Full Scale = 1V
f
= 250kHz
CLK
A
CLK
A
T
= 25°C
f
= 250kHz
T
= 25°C
CLK
T
= 25°C
CC
A
V
= 5V
–0.5
–0.5
–0.5
–1.0
–1.0
–1.0
256 320 384 448 512 576 640 704 768 832
0
128 256 384 512 640 768 896 1024
256 320 384 448 512 576 640 704 768 832
CODE
CODE
CODE
1392 G02
1392 G03
1392 G01
Integral Nonlinearity
Differential Nonlinearity
Integral Nonlinearity
1.0
0.5
0
1.0
0.5
0
1.0
0.5
0
Full Scale = 0.5V
Full Scale = 1V
Full Scale = 0.5V
= 250kHz
f
= 250kHz
f
= 250kHz
f
CLK
A
CC
CLK
= 25°C
CC
CLK
A
CC
T
= 25°C
T
T
= 25°C
A
V
= 5V
V
= 5V
V
= 5V
–0.5
–0.5
–0.5
–1.0
–1.0
–1.0
0
128 256 384 512 640 768 896 1024
0
128 256 384 512 640 768 896 1024
0
128 256 384 512 640 768 896 1024
CODE
CODE
CODE
1392 G06
1392 G05
1392 G04
4
LTC1392
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Thermal Response in Stirred
Oil Bath
Supply Current vs Sample Rate
Thermal Response in Still Air
1000
100
10
70
65
60
55
50
45
40
35
30
25
20
70
65
60
55
50
45
40
35
30
25
20
V
CC
= 5V
V
= 5V
CC
CS LOW BETWEEN SAMPLES
CS HIGH BETWEEN
SAMPLES
N8
N8
1
S8
V
= 5V
CC
S8
f
= 250kHz
CLK
T
= 25°C
A
0.1
0.1
1
10
100
1k
10k
100k
0
5
15
TIME (SEC)
20
25
30
0
50
150
TIME (SEC)
200
250
300
10
100
SAMPLE FREQUENCY (Hz)
1392 G09
1392 G07
1392 G08
U
U
U
PIN FUNCTIONS
DIN (Pin 1): Digital Input. The A/D configuration word is
shifted into this input.
GND (Pin 5): Ground Pin. GND should be tied directly to
an analog ground plane.
DOUT (Pin 2): Digital Output. The A/D result is shifted out
of this output.
+VIN (Pin 6): Positive Analog Differential Input. The pin
can be used as a single-ended input by grounding –VIN.
CLK(Pin3):ShiftClock. Thisclocksynchronizestheserial
data.
–VIN (Pin 7): Negative Analog Differential Input. The input
must be free from noise.
CS (Pin 4): Chip Select Input. A logic low on this input
enables the LTC1392.
VCC (Pin8): Positive Supply. This supply must be kept free
from noise and ripple by bypassing directly to the ground
plane.
W
BLOCK DIAGRAM
3
CLK
V
V
V
= 2.42V
= 1V
REF
REF
REF
INPUT
1
D
IN
SHIFT
BANDGAP
= 0.5V
REGISTER
2
D
OUT
SERIAL
PORT
10-BIT
CAPACITIVE DAC
10
BITS
TEMPERATURE
SENSOR
+
GND
–
+
–
+
–
COMP
10-BIT
SAR
ANALOG
INPUT
MUX
V
CC
V
REF
6
7
C
SAMPLE
+V
IN
–V
IN
4
CONTROL
AND TIMING
CS
8
CC
5
GND
LTC1392 • BD
V
5
LTC1392
TEST CIRCUITS
Voltage Waveforms for DOUT Delay Time, tdDO
Load Circuit for tdDO, tr and tf
1.4V
CLK
V
IL
3k
t
dDO
D
TEST POINT
OUT
V
OH
100pF
D
OUT
V
OL
LTC1392 • TC02
LTC1392 • TC03
Voltage Waveforms for DOUT Rise and Fall Times, tr and tf
Voltage Waveforms for tdis
V
OH
D
OUT
V
OL
2.0V
CS
t
t
f
1392 TC04
r
D
OUT
90%
10%
WAVEFORM 1
(SEE NOTE 1)
Load Circuit for tdis and ten
t
dis
D
OUT
TEST POINT
WAVEFORM 2
(SEE NOTE 2)
NOTE 1: WAVEFORM 1 IS FOR AN OUTPUT WITH INTERNAL CONDITIONS SUCH
THAT THE OUTPUT IS HIGH UNTIL DISABLED BY THE OUTPUT CONTROL.
NOTE 2: WAVEFORM 2 IS FOR AN OUTPUT WITH INTERNAL CONDITIONS SUCH
THAT THE OUTPUT IS LOW UNTIL DISABLED BY THE OUTPUT CONTROL.
5V t WAVEFORM 2, t
dis
en
3k
D
OUT
t
WAVEFORM 1
dis
LTC1392 • TC06
100pF
LTC1392 • TC05
U
W U U
APPLICATIONS INFORMATION
The LTC1392 is a micropower data acquisition system
designed to measure temperature, an on-chip power
supplyvoltageandadifferentialinputvoltage.TheLTC1392
contains the following functional blocks:
DIGITAL CONSIDERATIONS
Serial Interface
The LTC1392 communicates with microprocessors and
other external circuitry via a synchronous, half-duplex,
3-wire serial interface (see Figure 1). The clock (CLK)
synchronizes the data transfer with each bit being trans-
mitted on the falling CLK edge and captured on the rising
CLK edge in both transmitting and receiving systems. The
input data is first received and then the A/D conversion
result is transmitted (half-duplex). Half-duplex operation
allows DIN and DOUT to be tied together allowing transmis-
sion over three wires: CS, CLK and DATA (DIN/DOUT). Data
transferisinitiatedbyafallingchipselect(CS)signal.After
the falling CS is recognized, an 80µs delay is needed for
1. On-chip temperature sensor
2. 10-bit successive approximation capacitive ADC
3. Bandgap reference
4. Analog multiplexer (MUX)
5. Sample-and-hold (S/H)
6. Synchronous, half-duplex serial interface
7. Control and timing logic
6
LTC1392
U
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APPLICATIONS INFORMATION
MSB-First Data (MSBF = 1)
t
CYC
CS
t
suCS
CLK
t
WAKEUP
SEL1 SEL0
D
IN
START
Hi-Z
MSBF
Hi-Z
B9 B8
B7
B6
B5
B4
B3
B2
B1
D
B0
OUT
FILLED WITH ZEROS
t
SMPL
t
CONV
t
CYC
CS
t
suCS
CLK
t
WAKEUP
SEL1 SEL0
D
IN
START
Hi-Z
MSBF
SMPL
Hi-Z
B9 B8
B7
B6
B5
B4
B3
B2
B1
D
B0 B1
B2 B3
B4
B5
B6
B7 B8
B9
OUT
FILLED WITH ZEROS
t
CONV
t
LTC1392 • F01
Figure 1
temperature measurement or a 10µs delay for other mea-
surements, followed by a 4-bit input word which config-
ures the LTC1392 for the current conversion. This data
wordisshiftedintotheDIN input. DIN isthendisabledfrom
shifting in any data and the DOUT pin is configured from
three-state to an output pin. A null bit and the result of the
current conversion are serially transmitted on the falling
CLK edge onto the DOUT line. The format of the A/D result
can be either MSB-first sequence or MSB-first sequence
followed by an LSB-first sequence. This provides easy
interface to MSB- or LSB-first serial ports. Bringing CS
high resets the LTC1392 for the next data exchange.
DIN input which configures the LTC1392 and starts the
conversion. Further inputs on the DIN input are then
ignored until the next CS cycle. The four bits of the input
word are defined as follows:
BIT 3
BIT 2
BIT 1
BIT 0
Start
Select 1
Select 0
MSBF
Start Bit
The first “logic one” clocked into the DIN input after CS
goes low is the Start Bit. The Start Bit initiates the data
transfer and all leading zeros which precede this logical
one will be ignored. After the Start Bit is received the
remaining bits of the input word will be clocked in. Further
input on the DIN pin are then ignored until the next CS
cycle.
INPUT DATA WORD
Datatransferisinitiatedbyafallingchipselect(CS)signal.
After CS falls, the LTC1392 looks for a start bit. Once the
start bit is received, the next three bits are shifted into the
7
LTC1392
U
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APPLICATIONS INFORMATION
Measurement Mode Selections
tures outside these specified temperature ranges is not
guaranteedanderrorsmaybegreaterthanthoseshownin
the Electrical Characteristics table.
ThetwobitsoftheinputwordfollowingtheStartBitassign
the measurement mode for the requested conversion.
Table 1 shows the mode selections. Whenever there is a
mode change from another mode to temperature mea-
surement, atemperaturemodeinitializingcycleisneeded.
The first temperature data measurement after a mode
change should be ignored.
Table 2. Codes for Temperature Conversion
OUTPUT CODE
1111111111
1111111110
...
TEMPERATURE (°C)
125.75
125.50
...
1001101101
1001101100
1001101011
...
25.25
25.00
24.75
...
Table 1. Measurement Mode Selections
SELECT
1
SELECT
0
MEASUREMENT MODE
Temperature
0
0
1
1
0
1
0
1
Power Supply Voltage
0000000001
0000000000
–129.75
–130.00
Differential Input, 1V Full Scale
Differential Input, 0.5V Full Scale
Voltage Supply (VCC) Monitor
MSB-First/LSB-First (MSBF)
The LTC1392 measures supply voltage through the on-
chip VCC supply line. The VCC reading is provided in a
10-bit, unipolar format. Table 3 describes the exact rela-
tionship of output data to measured VCC or equation (2)
can be used to calculate the measured VCC.
The output data of the LTC1392 is programmed for
MSB-firstorLSB-firstsequenceusingtheMSBFbit.When
the MSBF bit is a logical one, data will appear on the DOUT
line in MSB-first format. Logical zeros will be filled in
indefinitely following the last data bit to accommodate
longer word lengths required by some microprocessors.
When the MSBF bit is a logical zero, LSB-first data will
follow the normal MSB-first data on the DOUT line.
Measured VCC
=
[(Output Code) • 4.84/1024] + 2.42
(2)
Theguaranteedsupplyvoltagemonitorrangeisfrom4.5V
to 6V. Typical parts are able to maintain measurement
accuracy with VCC as low as 3.25V. The typical INL and
DNL error plots shown on page 4 are measured with VCC
from 3.63V to 6.353V.
CONVERSIONS
Temperature Conversion
Table 3. Codes for Voltage Supply Conversion
TheLTC1392measurestemperaturethroughtheuseofan
on-chip,proprietarytemperaturemeasurementtechnique.
The temperature reading is provided in a 10-bit, unipolar
format. Table 2 describes the exact relationship of output
data to measured temperature or equation 1 can be used
to calculate the temperature.
OUTPUT CODE
1011110110
1011110101
...
Supply Voltage (V )
CC
6.003V
5.998V
...
1000100010
...
5.001V
...
Temperature (°C) = Output Code/4 – 130
(1)
0110111001
0110111000
4.504V
4.500V
Note that the LTC1392C is only specified for operation
over the 0°C to 70°C temperature range and the LTC1392I
over the –40°C to 85°C range. Performance at tempera-
8
LTC1392
U
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APPLICATIONS INFORMATION
Thermal Coupling/Airflow
Differential Voltage Conversion
The supply current of the LTC1392 is 700µA typically
whenrunningatthemaximumconversionrate.Theequiva-
lent power dissipation of 3.5mW causes a temperature
rise of 0.455°C in the SO8 and 0.35°C in PDIP packages
duetoself-heatingeffects. Atsamplingrateslessthan400
samplespersecond, lessthan20µAcurrentisdrawnfrom
the supply (see Typical Performance Characteristics) and
the die self-heating effect is negligible. This LTC1392 can
be attached to a surface (such as microprocessor chip or
a heat sink) for precision temperature monitoring. The
package leads are the principal path to carry the heat into
the device; thus any wiring leaving the device should be
held at the same temperature as the surface. The easiest
way to do this is to cover up the wires with a bead of epoxy
which will ensure that the leads and wires are at the same
temperature as the surface. The thermal time constant of
the LTC1392 in still air is about 22 seconds (see the graph
in the Typical Performance Charateristics section). At-
taching an LTC1392 to a small metal fin (which also
provides a small thermal mass) will help reduce thermal
time constant, speed up the response and give the steadi-
est reading in slow moving air.
The LTC1392 measures the differential input voltage
through pins +VIN and –VIN. Input ranges of 0.5V or 1V
full scale are available for differential voltage measure-
mentwithresolutionsof10bits.Tables4aand4bdescribe
the exact relationship of output data to measured differen-
tial input voltage in the 1V and 0.5V input range. Equations
(3) and (4) can be used to calculate the differential voltage
in the 1V and 0.5V input voltage range respectively. The
output code is in unipolar format.
Differential Voltage = 1V • (10-bit code)/1024
Differential Voltage = 0.5V • (10-bit code)/1024
(3)
(4)
Table 4a. Codes for 1V Differential Voltage Range
OUTPUT
CODE
INPUT
VOLTAGE
INPUT
RANGE = 1V
REMARKS
1111111111
1111111110
...
1V – 1LSB
1V – 2LSB
...
999.0mV
998.0mV
...
0000000001
0000000000
1LSB
0.977mV
0.00mV
1LSB = 1/1024
0LSB
Table 4b. Codes for 0.5V Differential Voltage Range
OUTPUT
CODE
INPUT
VOLTAGE
INPUT
RANGE = 0.5V
REMARKS
1111111111
1111111110
...
0.5V – 1LSB
0.5V – 2LSB
...
499.5mV
499.0mV
...
0000000001
0000000000
1LSB
0.488mV
0.00mV
1LSB = 0.5/1024
0LSB
9
LTC1392
TYPICAL APPLICATIONS
U
System Monitor for Two Supply Voltages and Ambient Temperature
5V
1N4148
22Ω
220µF
10V
×4
+
0.1µF
+
+V
IN
10µF
16V
0.1µF
V
OUT
3.3V
LTC1392
V
PV
+
2.5µH
CC
CC
M2
M1
8
7
6
5
1
2
3
4
10µF
15A
G1
P1.4
V
D
CC
IN
0.1µF
MPU
(e.g., 8051)
G2
FB
C
O
+
–V
D
OUT
M3
100k
33k
330µF
6.3V
×6
IN
LTC1430
COMP SHDN
GND
SHDN
P1.3
P1.2
+V
CLK
CS
IN
R
C
0.1µF
C1
220pF
7.5k
–V
100pF
GND
IN
C
C
4700pF
LTC1392 • TA03
M1, M2, M3:
MOTOROLA MTD20N03HL
10k
12k
10k
TRIMMED TO
V
= 3.3V
OUT
System Monitor for Relative Humidity, Supply Voltage and Ambient Temperature
0.01µF
1/4 LTC1043
7
8
16
5V
0.1µF
–5V
470Ω
5V
11
–5V
17
0.1µF
0.1µF
0.1µF
100pF
5V
1k
1%
5V
LTC1392
1/4 LTC1043
8
7
6
5
1
V
500Ω
90%
RH TRIM
P1.4
D
CC
IN
2
7
OUTPUT
0V TO 1V =
0% TO 100%
6
13
14
0.1µF
–
+
2
3
4
10k
6
3
–V
+V
MPU
(e.g., 8051)
P1.3
D
LT®1056
4
IN
1µF
OUT
+
3
LM301A
CLK
CS
IN
2
8
LT1004-1.2
–
1
GND
P1.2
12
0.1µF
100pF
–5V
1µF
SENSOR: PANAMETRICS #RHS
500pF AT RH = 76%
1.7pF/%RH
22M
SENSOR
10k
5%
RH TRIM
0.1µF
9k*
1k*
* 1% FILM RESISTOR
–5V
33k
1392 TA04
10
LTC1392
U
PACKAGE DESCRIPTION Dimemsions in inches (millimeters) unless otherwise noted.
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.400*
(10.160)
MAX
8
7
6
5
4
0.255 ± 0.015*
(6.477 ± 0.381)
1
2
3
0.130 ± 0.005
0.300 – 0.325
0.045 – 0.065
(3.302 ± 0.127)
(1.143 – 1.651)
(7.620 – 8.255)
0.065
(1.651)
TYP
0.009 – 0.015
(0.229 – 0.381)
0.125
(3.175)
MIN
0.005
(0.127)
MIN
0.015
+0.025
–0.015
(0.380)
MIN
0.325
+0.635
8.255
(
)
–0.381
0.100 ± 0.010
(2.540 ± 0.254)
0.018 ± 0.003
(0.457 ± 0.076)
N8 0695
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
7
5
8
6
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
1
3
4
2
0.010 – 0.020
(0.254 – 0.508)
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
0.016 – 0.050
0.406 – 1.270
0.050
(1.270)
BSC
0.014 – 0.019
(0.355 – 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
SO8 0695
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
LTC1392
U
O
TYPICAL APPLICATI
Measuring a Secondary Temperature with an External Thermistor
ERT-D2FHL103S DIVIDER OUTPUT VOLTAGE
VS TEMPERATURE
1.5
1.4
1.3
IDEAL OUTPUT (V) =
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–11.15mV/°C • TEMPERATURE + 1.371
ACTUAL
DIVIDER
OUTPUT
60
20
30
40
50
70
V
80
TEMPERATURE (°C)
5V
R1*
6.8k
5V
LTC1392
8
7
6
5
1
2
3
4
P1.4
D
CC
IN
R2*
1.8k
–V
MPU
(e.g., 8051)
P1.3
D
IN
IN
OUT
+V
CLK
CS
IDEAL OUTPUT (V) =
LT1004-1.2
–11.15mV/°C • TEMPERATURE + 1.371
GND
P1.2
TEMPERATURE RANGE: 38°C TO 80°C ±4°C
R
= ERT – D2FHL103S
T
ASSUMING 3% β AND
10% R TOLERANCES
TO
1392 TA05
* 1% FILM RESISTOR
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENT
LT1025
Micropower Thermocouple Cold Junction Compensator
Compatible with Standard Thermocouples (E, J, K, R, S, T)
Differential or 2-Channel Multiplexed, Single Supply
Differential or 2-Channel Multiplexed, Single Supply
LTC1285/LTC1288 3V Micropower 12-Bit ADCs with Auto Shutdown
LTC1286/LTC1298 Micropower 12-Bit ADCs with Auto Shutdown
LTC1391
LM334
Low Power, Precision 8-to-1 Analog Multiplexer
Constant Current Source and Temperature Sensor
SPI, QSPI Compatible, Single 5V or 3V, Low R , Low Charge Injection
ON
3 Pins, Current Out Pin
1392f LT/TP 0497 7K • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1995
12 Linear Technology Corporation
●
1630McCarthyBlvd., Milpitas, CA95035-7417 (408)432-1900
●
●
FAX: (408) 434-0507 TELEX: 499-3977 www.linear-tech.com
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