LTC1392IN8_技术文档

LTC1392

MicropowerTemperature,

Power Supply and

DifferentialVoltageMonitor

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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.

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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

V

CC

IN

R

SENSE

MPU

–1

–2

–3

–4

–5

–V

+V

OUT

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

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ABSOLUTE AXI U RATI GS

PACKAGE RDER I FOR ATIO

(Note 1)

ORDER PART

Supply Voltage (V_CC) ................................................ 7V

Input Voltage ................................. –0.3V to V_CC+ 0.3V

Output Voltage............................... –0.3V to V_CC+ 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

T_JMAX= 125°C, θ_JA= 100°C/ W (N8)

T_JMAX= 125°C, θ_JA= 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

= 4.5V to 6V

10

Bit

CC

Total Absolute Error

●

±8

LSB

Differential Voltage to Digital

Conversion (Full-Scale Input = 1V)

Resolution

10

±1

Bit

LSB

Integral Linearity Error (Note 5)

Differential Linearity Error

Offset Error

●

±0.5

±1

±4

Full-Scale Error

±15

Differential Voltage to Digital

Conversion (Full-Scale Input = 0.5V)

Resolution

10

±2

Bit

LSB

Integral Linearity Error (Note 5)

Differential Linearity Error

Offset Error

●

±0.5

±1

±8

Full-Scale Error

±25

Temperature to Digital Conversion

Accuracy

T = 25°C (Note 7)

±2

±4

°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

V

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

= 5.25V

= 4.75V

2

IH

IL

CC

IN

0.8

5

V

I

= V

µA

IH

IL

CC

= 0V

–5

IN

V

= 4.75V, I

= 10µA

= 360µA

4.5

2.4

4.74

4.72

V

OH

CC

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

CS = High

±5

OZ

V

= 0V

–25

45

mA

SOURCE

SINK

CC

OUT

= V

CC

CS = High

CS = Low, V = 5V

●

0.1

0.7

5

1

µA

mA

CC

t

Analog Input Sample Time

Conversion Time

See Figure 1

1.5

10

CLK Cycles

SMPL

CONV

dDO

en

CLK Cycles

Delay Time, CLK↓ to D

Data Valid

Data Enabled

Hi-Z

C

= 100pF

●

150

60

300

150

450

ns

OUT

LOAD

Delay Time, CS ↑ to D

170

30

dis

Time Output Data Remains Valid After CLK↓

C

= 100pF

hDO

f

LOAD

D

Fall Time

●

70

250

100

OUT

Rise Time

25

r

C

Input Capacitance

Analog Input On-Channel

Analog Input Off-Channel

30

5

pF

IN

5

pF

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U ^{Digital Input}

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RECOM ENDED OPERATING CONDITIONS

SYMBOL

PARAMETER

CONDITIONS

MIN

4.5

TYP

MAX

6

UNITS

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

CLK

Temperature Conversion Only

t

Hold Time, D After CLK↑

V

= 5V

150

2

ns

hDI

IN

CC

Setup Time CS↓ Before First CLK↑ (See Figure 1)

Wakeup Time CS↓ Before Start Bit↑ (See Figure 1)

µs

suCS

10

80

µs

WAKEUP

Temperature Conversion Only

t

Setup Time, D Stable Before CLK↑

V

= 5V

150

1.6

2

ns

µs

suDI

IN

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

2

CLK

= 5V, f

72

142

µs

Temperature Conversion Only

3

LTC1392

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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

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.

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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

–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

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

= 25°C

A

V

= 5V

V

= 5V

V

= 5V

–0.5

–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

1392 G06

1392 G05

1392 G04

4

LTC1392

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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

1

S8

V

= 5V

CC

S8

f

= 250kHz

CLK

T

= 25°C

A

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

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PIN FUNCTIONS

D_IN(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.

D_OUT(Pin 2): Digital Output. The A/D result is shifted out

of this output.

+V_IN(Pin 6): Positive Analog Differential Input. The pin

can be used as a single-ended input by grounding –V_IN.

CLK(Pin3):ShiftClock. Thisclocksynchronizestheserial

data.

–V_IN(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.

V_CC(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

= 2.42V

= 1V

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 D_OUTDelay Time, t_dDO

Load Circuit for t_dDO, t_rand t_f

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 D_OUTRise and Fall Times, t_rand t_f

Voltage Waveforms for t_dis

V

OH

D

OUT

V

OL

2.0V

CS

t

f

1392 TC04

r

D

OUT

90%

10%

WAVEFORM 1

(SEE NOTE 1)

Load Circuit for t_disand t_en

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

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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 D_INand D_OUTto be tied together allowing transmis-

sion over three wires: CS, CLK and DATA (D_IN/D_OUT). 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

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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

wordisshiftedintotheD_INinput. D_INisthendisabledfrom

shifting in any data and the D_OUTpin 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 D_OUTline. 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.

D_INinput which configures the LTC1392 and starts the

conversion. Further inputs on the D_INinput 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 D_INinput 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 D_INpin 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

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LTC1392

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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

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 (V_CC) Monitor

MSB-First/LSB-First (MSBF)

The LTC1392 measures supply voltage through the on-

chip V_CCsupply line. The V_CCreading is provided in a

10-bit, unipolar format. Table 3 describes the exact rela-

tionship of output data to measured V_CCor equation (2)

can be used to calculate the measured V_CC.

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 D_OUT

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 D_OUTline.

Measured V_CC

=

[(Output Code) • 4.84/1024] + 2.42

(2)

Theguaranteedsupplyvoltagemonitorrangeisfrom4.5V

to 6V. Typical parts are able to maintain measurement

accuracy with V_CCas low as 3.25V. The typical INL and

DNL error plots shown on page 4 are measured with V_CC

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-

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LTC1392

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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 +V_INand –V_IN. 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

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

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

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

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

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


型号：	LTC1392IN8
厂家：	Linear
描述：	Micropower Temperature, Power Supply and Differential Voltage Monitor 微功耗温度，电源和差分电压监控器模拟IC 信号电路光电二极管监控
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

LTC1392IN8 [Linear]

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