AD7414ART-1REEL_技术文档

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C

ꢂ74ꢀ4/ ꢂ74ꢀ.

FUNCTIONAL BLOCK DIAGRAM

FEATURES

10-bit temperature-to-digital converter

Temperature range: −40°C to +125°C

Typical accuracy of 0.5°C at +40°C

SMBus/I²C®-compatible serial interface

3 µA power-down current

Temperature conversion time: 29 µs typ

Space-saving 6-lead (AD7414) and 5-lead (AD7415)

SOT-23 packages

10-BIT

ANALOG-DIGITAL

CONVERTER

BAND GAP

TEMPERATURE

SENSOR

GND

V

DD

CONFIGURATION

REGISTER

TEMPERATURE

VALUE

REGISTER

T

SETPOINT

HIGH

REGISTER

SETPOINT

COMPARATOR

T

SETPOINT

ALERT

LOW

REGISTER

Pin selectable addressing via AS

SCL

SDA

2

SMBus/I C

INTERFACE

AS

Overtemperature indicator (AD7414 Only)

SMBus alert function (AD7414 only)

4 versions allow 8 I²C addresses (AD7414)

2 versions allow 6 I²C addresses (AD7415)

AD7414

AD7415

10-BIT

BAND GAP

ANALOG-DIGITAL

CONVERTER

TEMPERATURE

SENSOR

GND

V

DD

APPLICATIONS

Hard disk drives

TEMPERATURE

VALUE

REGISTER

Personal computers

Electronic test equipment

Office equipment

Domestic appliances

Process control

CONFIGURATION

REGISTER

AS

SCL

SDA

2

SMBus/I C

INTERFACE

Cellular phones

Figure 1.

GENERAL DESCRIPTION

limit is exceeded. A configuration register allows programming of

the state of the ALERT output (active high or active low). This

output can be used as an interrupt or as an SMBus alert.

The AD7414/AD7415 are complete temperature monitoring

systems in 6-lead and 5-lead SOT-23 packages. They contain a

band gap temperature sensor and a 10-bit ADC to monitor and

digitize the temperature reading to a resolution of 0.25°C.

PRODUCT HIGHLIGHTS

The AD7414/AD7415 provide a 2-wire serial interface that is

compatible with SMBus and I²C interfaces. The parts come in four

versions: the AD7414/AD7415-0, AD7414/AD7415-1, AD7414-2,

and AD7414-3. The AD7414/AD7415-0 and AD7414/AD7415-1

versions provide a choice of three different SMBus addresses for

each version. All four AD7414 versions give the possibility of eight

different I²C addresses while the two AD7415 versions allow up to

six I²C addresses to be used.

1. On-chip temperature sensor. The sensor allows an accurate

measurement of the ambient temperature to be made. It is

capable of 0.5°C temperature accuracy.

2. SMBus/I²C-compatible serial interface. The interface offers pin

selectable choice of three addresses per version of the

AD7414/AD7415, eight address options in total for the AD7414,

and six in total for the AD7415.

3. Supply voltage of 2.7 V to 5.5 V.

The AD7414/AD7415’s 2.7 V supply voltage, low supply current,

serial interface, and small package size make them ideal for a

variety of applications, including personal computers, office

equipment, cellular phones, and domestic appliances.

4. Space-saving 5-lead and 6-lead SOT-23 packages.

5. 10-bit temperature reading to 0.25°C resolution.

6. Overtemperature indicator. This indicator can be software

disabled. It is used as an interrupt of SMBus alert.

In the AD7414, on-chip registers can be programmed with high

and low temperature limits, and an open-drain overtemperature

indicator output (ALERT) becomes active when a programmed

7. One-shot and automatic temperature conversion rates.

Rev. E

Information furnished by Analog Devices is believed to be accurate and reliable.

However, no responsibility is assumed by Analog Devices for its use, nor for any

infringements of patents or other rights of third parties that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

www.analog.com

ꢂ74ꢀ4/ ꢂ74ꢀ.C

T -LECOFC°ONTENTS

Specifications .....................................................................................3

Absolute Maximum Ratings ............................................................5

ESD Caution ..................................................................................5

Pin Configurations and Function Descriptions............................6

Theory of Operation.........................................................................7

Circuit Information ......................................................................7

Functional Description.................................................................7

Measurement Technique..............................................................7

Temperature Data Format............................................................8

Internal Register Structure...............................................................9

Address Pointer Register..............................................................9

Configuration Register (Address 0X01) .....................................9

Temperature Value Register (Address 0X00)...........................10

AD7414 T_HIGHRegister (Address 0X02) ...................................10

AD7414 T_LOWRegister (Address 0X03)....................................10

Serial Interface.................................................................................12

Serial Bus Address.......................................................................12

Write Mode ..................................................................................12

Read Mode...................................................................................12

SMBUS ALERT ............................................................................13

Power-On Defaults .....................................................................13

Operating Modes ........................................................................13

Power vs. Throughput ................................................................14

Mounting the AD7414/AD7415 ...............................................14

Supply Decoupling......................................................................14

Temperature Accuracy vs. Supply.............................................15

Typical Temperature Error Graph ............................................15

Outline Dimensions........................................................................16

Ordering Guide ...........................................................................17

REVISION HISTORY

4/05—Rev. D to Rev. E

11/02—REV. A to REV. B.

Updated Format.................................................................. Universal

Changes to Absolute Maximum Ratings........................................6

Changes to Figure 6...........................................................................7

Changes to Ordering Guide...........................................................17

Changes to ABSOLUTE MAXIMUM RATINGS.........................3

10/02—REV. 0 to REV. A.

Changes to SPECIFICATIONS .......................................................2

Changes to PIN FUNCTION DESCRIPTIONS...........................3

Changes to ABSOLUTE MAXIMUM RATINGS.........................3

ORDERING GUIDE updated .........................................................4

Change to Figure 2............................................................................5

Added to TYPICAL TEMPERATURE

ERROR GRAPH section ................................................................11

Added Figure 15..............................................................................11

OUTLINE DIMENSIONS updated..............................................12

9/04—REV. C to REV. D.

Changes to ABSOLUTE MAXIMUM RATINGS.........................3

Updated ORDERING GUIDE.........................................................4

8/03—REV. B to REV. C.

Change to Temperature Range ......................................... Universal

Updated FEATURES.........................................................................1

Updated SPECIFICATIONS............................................................2

Updated ABSOLUTE MAXIMUM RATINGS .............................3

Updated ORDERING GUIDE.........................................................4

Updated CIRCUIT INFORMATION ............................................5

Updated TEMPERATURE DATA FORMAT................................6

Updated TEMPERATURE VALUE REGISTER ...........................8

Updated Figure 14...........................................................................11

Updated OUTLINE DIMENSIONS .............................................12

7/01—Revision 0: Initial Version

Rev. E | Page 2 of 20

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ꢂ74ꢀ4/ ꢂ74ꢀ.

SPE°IFI° TIONSC

T_A= T_MINto T_MAX, V_DD= 2.7 V to 5.5 V, unless otherwise noted. Temperature range as follows: A version = −40°C to +125°C.

Table 1.

Parameter

A Version

Unit

Test Conditions/Comments

TEMPERATURE SENSOR AND ADC

Accuracy¹

0.ꢀ

°C typ

°C max

°C typ

°C max

°C typ

°C max

°C typ

Bits

V_DD= 3 V @ +40°C

−0.87 to +0.82²

1.ꢀ

2.0

3.0

2.0

1.87

2.0

3.0

10

V_DD= 3 V @ −40°C to +70°C

V_DD= 3 V @ −40°C to +8ꢀ°C

V_DD= 3 V @ −40°C to +12ꢀ°C

V_DD= ꢀ.ꢀ V @ +40°C

V_DD= ꢀ.ꢀ V @ −40°C to +8ꢀ°C

V_DD= ꢀ.ꢀ V @ −40°C to +12ꢀ°C

2

Resolution

Update Rate, t_R

Temperature Conversion Time

800

2ꢀ

ms typ

µs typ

POWER SUPPLIES

Supply Current³

Peak Supply Current⁴

Supply Current – Nonconverting

Inactive Serial Bus^ꢀ

Normal Mode @ 3 V

Normal Mode @ ꢀ V

Active Serial Bus⁶

1.2

900

mA typ Current during conversion

µA max Peak current between conversions

169

188

µA typ

Supply current with serial bus inactive. Part not

converting and D7 of configuration register = 0.

Normal Mode @ 3 V

Normal Mode @ ꢀ V

Shutdown Mode

180

214

3

µA typ

Supply current with serial bus active. Part not

converting and D7 of configuration register = 0.

µA max D7 of configuration register = 1. Typical values

are 0.04 µA at 3 V and 0.ꢀ µA at ꢀ V.

DIGITAL INPUT

Input High Voltage, V_IH

Input Low Voltage, V_IL

Input Current, I_IN

2.4

0.8

1

V min

V max

7

µA max V_IN= 0 V to V_DD

pF max All digital inputs

Input Capacitance, C_IN

10

DIGITAL OUTPUT (OPEN-DRAIN)

Output High Voltage, V_OH

Output Low Voltage, V_OL

Output High Current, I_OH

Output Capacitance, C_OUT

ALERT Output Saturation Voltage

AC ELECTRICAL CHARACTERISTICS^{8, 9}

Serial Clock Period, t₁

Data In Setup Time to SCL High, t₂

Data Out Stable after SCL Low, t₃

2.4

0.4

1

10

0.8

V min

V max

µA max V_OH= ꢀ V

pF max Typ = 3 pF

V max

I_OL= 1.6 mA

I_OUT= 4 mA

2.ꢀ

ꢀ0

0

µs min

ns min

See Figure 2

Rev. E | Page 3 of 20

ꢂ74ꢀ4/ ꢂ74ꢀ.C

Parameter

A Version

Unit

Test Conditions/Comments

SDA Low Setup Time to SCL Low

(Start Condition), t₄

ꢀ0

ns min

See Figure 2

SDA High Hold Time after SCL High

(Stop Condition), t_ꢀ

SDA and SCL Fall Time, t₆

Power-Up Time

ꢀ0

ns min

See Figure 2

90

4

ns max

µs typ

¹Accuracy specifications apply only to voltages listed under Test Conditions. See Temperature Accuracy vs. Supply section for typical accuracy performance over the

full V_DDsupply range.

²100% production tested at 40°C to these limits.

³These current values can be used to determine average power consumption at different one-shot conversion rates. Average power consumption at the automatic

conversion rate of 1.2ꢀ kHz is 940 µW.

⁴This peak supply current is required for 29 µs (the conversion time plus power-up time) out of every 800 µs (the conversion rate).

^ꢀThese current values are derived by not issuing a stop condition at the end of a write or read, thus preventing the part from going into a conversion.

⁶The current is derived assuming a 400 kHz serial clock being active continuously.

⁷On power-up, the initial input current, I_IN, on the AS pin is typically ꢀ0 µA.

⁸The SDA and SCL timing is measured with the input filters turned on so as to meet the fast mode I²C specification. Switching off the input filters improves the transfer

rate but has a negative effect on the EMC behavior of the part.

⁹Guaranteed by design. Not tested in production.

t₁

SCL

t₄

t₂

t₅

SDA

DATA IN

t₃

SDA

DATA OUT

t₆

Figure 2. Diagram for Serial Bus Timing

Rev. E | Page 4 of 20

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ꢂ74ꢀ4/ ꢂ74ꢀ.

-SOLUTECM XIMUMCR TINGSC

Table 2.

Stresses above those listed under Absolute Maximum Ratings

may cause permanent damage to the device. This is a stress

rating only; functional operation of the device at these or any

other conditions above those indicated in the operational

section of this specification is not implied. Exposure to absolute

maximum rating conditions for extended periods may affect

device reliability.

Parameter

Rating

V_DDto GND

−0.3 V to +7 V

−40°C to +12ꢀ°C

−6ꢀ°C to +1ꢀ0°C

1ꢀ0°C

SDA Input Voltage to GND

SDA Output Voltage to GND

SCL Input Voltage to GND

ALERT Output Voltage to GND

Operating Temperature Range

Storage Temperature Range

Junction Temperature

ꢀ-Lead SOT-23 (RJ-ꢀ)

Power Dissipation^{1, 2}

Thermal Impedance³

θ_JA, Junction-to-Ambient

(still air)

W_MAX= (T_JMAX− T_A)/θ_JA

240°C/W

6-Lead SOT-23 (RJ-6)

Power Dissipation^{1, 2}

Thermal Impedance³

W_MAX= (T_JMAX− T_A)/θ_JA

190.4°C/W

θ_JA, Junction-to-Ambient

(still air)

8-Lead MSOP (RM-8)

Power Dissipation^{1, 2}

Thermal Impedance³

W_MAX= (T_JMAX− T_A)/θ_JA

θ_JA, Junction-to-Ambient

(still air)

θ_JC, Junction-to-Case

IR Reflow Soldering

Peak Temperature

20ꢀ.9°C/W

43.74°C/W

220°C (0°C/ꢀ°C)

10 sec to 20 sec

3°C/s max

Time at Peak Temperature

Ramp-up Rate

Ramp-down Rate

−6°C/s max

Ramp from 2ꢀ°C to Peak

Temperature

6 minutes max

IR Reflow Soldering in Pb-Free

Package

Peak Temperature

Time at Peak Temperature

Ramp Rate

260°C (0°C)

20 sec to 40 sec

3°C/s max

Ramp-Down Rate

−6°C/s max

Ramp from 2ꢀ°C to Peak

Temperature

8 minutes max

¹Values relate to package being used on a standard 2-layer PCB.

²T_A= ambient temperature.

³Junction-to-case resistance is applicable to components featuring a

preferential flow direction, such as components mounted on a heat sink.

Junction-to-ambient resistance is more useful for air-cooled, PCB-mounted

components.

ESD CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the

human body and test equipment and can discharge without detection. Although this product features

proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy

electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance

degradation or loss of functionality.

Rev. E | Page ꢀ of 20

ꢂ74ꢀ4/ ꢂ74ꢀ.C

PINC°ONFIGUR TIONSC NꢂCFUN°TIONCꢂES°RIPTIONSC

AS

1

2

3

6

5

4

SDA

NC

SDA

1

2

3

4

NC

AS

1

2

3

5

4

SDA

SCL

8

7

6

5

AD7414

Top View

(Not to Scale)

AD7415

Top View

(Not to Scale)

AD7414

Top View

(Not to Scale)

AS

GND

ALERT

SCL

ALERT

SCL

GND

V

DD

V

DD

Figure 3. AD7414 Pin Configuration (SOT-23)

Figure 5. AD7415 Pin Configuration (SOT-23)

NC = NO CONNECT

Figure 4. AD7414 Pin Configuration (MSOP)

Table 3. Pin Function Descriptions

Mnemonic Description

Table 4. I²C Address Selection

Part Number

AD7414-0

AD7414-1

AD7414-2

AD7414-3

AD741ꢀ-0

AD741ꢀ-1

AS Pin

Float

GND

V_DD

Float

GND

V_DD

I²C Address

1001 000

1001 001

1001 010

1001 100

1001 101

1001 110

1001 011

1001 111

1001 000

1001 001

1001 010

1001 100

1001 101

1001 110

AS

Logic Input. Address select input that selects one

of three I²C addresses for the AD7414/AD741ꢀ (see

Table 4). Recommend a pull-up or pull-down

resistor of 1 kΩ.

GND

V_DD

Analog and Digital Ground.

Positive Supply Voltage, 2.7 V to ꢀ.ꢀ V.

SDA

Digital I/O. Serial bus bidirectional data. Open-

drain output.

N/A

ALERT

SCL

AD7414 Digital Output. Overtemperature

indicator becomes active when temperature

exceeds T_HIGH. Open-drain output.

Float

GND

V_DD

Float

GND

V_DD

Digital Input. Serial bus clock.

Rev. E | Page 6 of 20

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ꢂ74ꢀ4/ ꢂ74ꢀ.

THEORYCOFCOPER TIONC

CIRCUIT INFORMATION

Configuration functions consist of

The AD7414/AD7415 are standalone digital temperature

sensors. The on-chip temperature sensor allows an accurate

measurement of the ambient device temperature to be made.

The 10-bit analog-to-digital converter converts the temperature

measured into a twos complement format for storage in the

temperature register. The ADC is made up of a conventional

successive-approximation converter based around a capacitor

digital-to-analog (DAC). The serial interface is I²C-and SMBus-

compatible. The AD7414/AD7415 require a 2.7 V to 5.5 V

power supply. The temperature sensor has a working

measurement range of −40°C to +125°C.

• Switching between normal operation and full power-

down

• Enabling or disabling the SCL and SDA filters

• Enabling or disabling the ALERT function

• Setting the ALERT pin polarity

V

DD

SUPPLY

2.7V TO

5.5V

FUNCTIONAL DESCRIPTION

10kΩ 10kΩ 10kΩ

10µF

0.1µF

1kΩ

Temperature measurement is initiated by two methods. The

first uses an internal clock countdown of 800 ms, and a

conversion is performed. The internal oscillator is the only

circuit that is powered up between conversions, and once it

times out, every 800 ms, a wake-up signal is sent to power up

the rest of the circuitry. A monostable is activated at the

beginning of the wake-up signal to ensure that sufficient time is

given to the power-up process. The monostable typically takes

4 µs to time out. It then takes typically 25 µs for each conversion

to be completed. The new temperature value is loaded into the

temperature value register and ready for reading by the I²C

interface.

V

DD

SDA

SCL

AS

µ

C/µP

GND

ALERT

AD7414

Figure 6. Typical Connection Diagram

MEASUREMENT TECHNIQUE

A common method of measuring temperature is to exploit the

negative temperature coefficient of a diode, or the base-emitter

voltage of a transistor, operated at constant current.

Unfortunately, this technique requires calibration to null the

effect of the absolute value of V_BE, which varies from device to

device. The technique used in the AD7414/AD7415 is to

measure the change in V_BEwhen the device is operated at two

different currents. This is given by

A temperature measurement is also initiated every time the

one-shot method is used. This method requires the user to

write to the one-shot bit in the configuration register when a

temperature measurement is needed. Setting the one-shot bit to

1 starts a temperature conversion directly after the write

operation. The track-and-hold goes into hold approximately

4 µs (monostable time out) after the STOP condition, and a

conversion is then initiated. Typically 25 µs later, the conversion

is complete and the temperature value register is loaded with a

new temperature value.

∆ V_BE= KT q × ln (N)

where:

K is Boltzmann’s constant.

The measurement modes are compared with a high tempera-

ture limit, stored in an 8-bit read/write register. This is applica-

ble only to the AD7414, because the AD7415 does not have an

ALERT pin and subsequently does not have an overtemperature

monitoring function. If the measurement is greater than the

high limit, the ALERT pin is activated (if it has already been

enabled in the configuration register). There are two ways to

deactivate the ALERT pin again: when the alert reset bit in the

configuration register is set to 1 by a write operation, and when

the temperature measured is less than the value in the T_LOW

register. This ALERT pin is compatible with the SMBus

SMBALERT option.

q is the charge on the electron (1.6 × 10^–19Coulombs).

T is the absolute temperature in Kelvins.

N is the ratio of the two currents.

Rev. E | Page 7 of 20

ꢂ74ꢀ4/ ꢂ74ꢀ.C

V

DD

Table 5. A Grade Temperature Data Format

Temperature

Digital Output DB9…DB0

11 0010 0100

11 0011 1000

11 1001 1100

11 1111 1111

00 0000 0000

00 0000 0001

00 0010 1000

00 0110 0100

00 1100 1000

01 0010 1100

01 1001 0000

01 1111 0100

I

I × N

−ꢀꢀ°C

−ꢀ0°C

−2ꢀ°C

−0.2ꢀ°C

0°C

+0.2ꢀ°C

+10°C

+2ꢀ°C

+ꢀ0°C

+7ꢀ°C

V

+

OUT

TO ADC

V

–

SENSING

TRANSISTOR

OUT

SENSING

TRANSISTOR

+100°C

+12ꢀ°C

Figure 7. Temperature Measurement Technique

Figure 7 shows the method the AD7414/AD7415 use to

measure the ambient device temperature. To measure ΔV_BE,

the sensor (substrate transistor) is switched between operating

currents of I and N × I. The resulting waveform is passed

through a chopper stabilized amplifier that performs the

functions of amplification and rectification of the waveform to

produce a dc voltage proportional to ΔV_BE. This voltage is

measured by the ADC to give a temperature output in 10-bit,

twos complement format.

The grade temperature conversion formula follows:

ADC Code (d)

Positive Temperature =

4

ADC Code (d) −512

Negative Temperature =

4

Note that DB9 is removed from the ADC code in the negative

temperature formula.

TEMPERATURE DATA FORMAT

The temperature resolution of the ADC is 0.25°C, which

corresponds to 1 LSB of the ADC. The ADC can theoretically

measure a temperature span of 255°C; the lowest practical value

is limited to −40°C due to the device maximum ratings. The

A grade can measure a temperature range of −40°C to +125°C.

(Temperature data format is shown in Table 5.)

Rev. E | Page 8 of 20

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ꢂ74ꢀ4/ ꢂ74ꢀ.

INTERN LCREGISTERCSTRU°TURE

Table 6. Address Pointer Register

The AD7414 has five internal registers, as shown in Figure 8.

Four are data registers, and one is an address pointer register.

P7

P6

P5

P4

P3

P2

P1

P0

0

Register Select

Table 7. AD7414 Register Address

TEMPERATURE

VALUE

REGISTER

P1

P0

Register

0

1

0

1

0

Temperature value register (read-only)

Configuration register (read/write)

T_HIGHregister (read/write)

CONFIGURATION

REGISTER

D

A

T

A

ADDRESS

POINTER

REGISTER

1

T_LOWregister (read/write)

T

HIGH

REGISTER

Table 8. AD7415 Register Address

P1

P0

Registers

0

1

Temperature value register (read-only)

Configuration register (read/write)

T

LOW

REGISTER

Table 9. AD7414 Configuration Register

SDA

SCL

SERIAL BUS INTERFACE

D7 D6

D5

D4

D3

D2

D1 D0

PD FLTR ALERT ALERT

ALERT

RESET

0¹

ONE

SHOT

0¹

TEST

MODE

0s¹

Figure 8. AD7414 Register Structure

EN

0¹

POLARITY

0¹

1¹

The AD7415 has three internal registers, as shown in Figure 9.

Two are data registers, and one is an address pointer register.

¹Default settings at power-up.

CONFIGURATION REGISTER (ADDRESS 0X01)

The configuration register is an 8-bit read/write register that is

used to set the operating modes of the AD7414/AD7415. In the

AD7414, six of the MSBs are used (D7 to D2) to set the

operating modes (see Table 10). D0 and D1 are used for factory

settings and must have zeros written to them during normal

operation.

TEMPERATURE

VALUE

REGISTER

ADDRESS

POINTER

REGISTER

D

A

T

A

CONFIGURATION

REGISTER

Table 10. AD7414 Configuration Register Settings

D7 Full power-down if = 1.

SDA

SCL

D6 Bypass SDA and SCL filtering if = 0.

Dꢀ Disable ALERT if = 1.

Figure 9. AD7415 Register Structure

D4 ALERT is active low if D4 = 0, ALERT is active high if D4 = 1.

Each data register has an address pointed to by the address

pointer register when communicating with it. The temperature

value register is the only data register that is read-only.

D3 Reset the ALERT pin if set to 1. The next temperature

conversion has the ability to activate the ALERT function.

The bit status is not stored; thus this bit is 0 if read.

D2 Initiate a one shot temperature conversion if set to a 1.

The bit status is not stored; thus this bit is 0 if read.

ADDRESS POINTER REGISTER

The address pointer register is an 8-bit register that stores an

address that points to one of the four data registers of the

AD7414 and one of the two data registers of the AD7415. The

first byte of every serial write operation to the AD7414/AD7415

is the address of one of the data registers, which is stored in the

address pointer register and selects the data register to which

subsequent data bytes are written. Only the 2 LSBs of this

register are used to select a data register.

Table 11. AD7415 Configuration Register

D7 D6

D5 D4 D3 D2

D1

ONE SHOT TEST MODE

0s¹0s¹

D0

PD FLTR

TEST MODE

0s¹

0¹

1¹

¹Default settings at power-up.

Rev. E | Page 9 of 20

ꢂ74ꢀ4/ ꢂ74ꢀ.C

In the AD7415, only three of the bits are used (D7, D6, and D2)

to set the operating modes (see Table 12). D0, D1, and D3 to D5

are used for factory settings and must have zeros written to

them during normal operation.

Table 13. Temperature Value Register (First Read)

D15

D14

D13

D12

D11

D10

D9

D8

MSB

B8

B7

B6

Bꢀ

B4

B3

B2

Table 12. AD7415 Configuration Register Settings

D7 Full power-down if = 1.

D6 Bypass SDA and SCL filtering if = 0.

D2 Initiate a one-shot temperature conversion if set to 1.

The bit status is not stored; thus this bit is 0 if read.

Table 14. AD7414 Temperature Value Register (Second Read)

D7 D6 D5 D4 D3 D2 D1 D0

B1 LSB ALERT_Flag T_HIGH_Flag T_LOW_Flag

0

Table 15. AD7415 Temperature Value Register (Second Read)

If the AD7414/AD7415 are in power-down mode (D7 = 1), a

temperature conversion can still be initiated by the one-shot

operation. This involves a write operation to the configuration

register and setting the one-shot bit to 1 (D2 = 1), which causes

the AD7414/AD7415 to power up, perform a single conversion,

and power down again. This is a very power efficient mode.

D7

D6

D5

D4

D3

D2

D1

D0

B1

LSB

N/A

AD7414 T_HIGHREGISTER (ADDRESS 0X02)

The T_HIGHregister (see Table 16) is an 8-bit, read/write register

that stores the upper limit that activates the ALERT output.

Therefore, if the value in the temperature value register is

greater than the value in the T_HIGHregister, the ALERT pin is

activated (that is, if ALERT is enabled in the configuration

register). Because it is an 8-bit register, the temperature

resolution is 1°C.

TEMPERATURE VALUE REGISTER (ADDRESS 0X00)

The temperature value register is a 10-bit, read-only register

that stores the temperature reading from the ADC in twos

complement format. Two reads are necessary to read data from

this register. Table 13 shows the contents of the first byte to be

read, while Table 14 and Table 15 show the contents of the

second byte to be read from the AD7414 and AD7415,

respectively. In Table 14, D3 to D5 of the second byte are used

as flag bits and are obtained from other internal registers. They

function as follows:

Table 16. T_HIGHRegister

D7

D6

D5

D4

D3

D2

D1

D0

MSB

B6

Bꢀ

B4

B3

B2

B1

B0

ALERT_Flag: The state of this bit is the same as that of the

ALERT pin.

AD7414 T_LOWREGISTER (ADDRESS 0X03)

The T_LOWregister (see Table 17) is an 8-bit read/write register

that stores the lower limit that deactivates the ALERT output.

Therefore, if the value in the temperature value register is less

than the value in the T_LOWregister, the ALERT pin is

deactivated (that is, if ALERT is enabled in the configuration

register).

T_HIGH_Flag: This flag is set to 1 when the temperature

measured goes above the T_HIGHlimit. It is reset

when the second temperature byte (Table 14) is

read. If the temperature is still greater than the

T_HIGHlimit after the read operation, the flag is

again.

Because it is an 8-bit register, the temperature resolution is 1°C.

T_LOW_Flag: This flag is set to 1 when the temperature

measured goes below the T_LOWlimit. It is reset

when the second temperature byte (Table 14) is

read. If the temperature is still less than the T_LOW

limit after the read operation, the flag is set again.

Table 17. T_LOWRegister

D7

D6

D5

D4

D3

D2

D1

D0

MSB

B6

Bꢀ

B4

B3

B2

B1

B0

The full theoretical span of the ADC is 255°C, but in practice

the temperature measurement range is limited to the operating

range of the device, −40°C to +125°C for the A grade.

Rev. E | Page 10 of 20

C

ꢂ74ꢀ4/ ꢂ74ꢀ.

1

9

1

9

SCL

SDA

0

1

A2

A1

A0

P6

P5

P3

P1

R/W

P7

P4

P2

P0

START BY

ACK. BY

STOP BY

MASTER

AD7414/AD7415

AD7414/AD7415 MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

ADDRESS POINTER REGISTER BYTE

Figure 10. Writing to the Address Pointer Register to Select a Register for a Subsequent Read Operation

1

9

1

9

• • •

SCL

SDA

R/W

A2

A1

A0

P7

P6

P5

P3

P2

P1

P0

1

P4

START BY

MASTER

ACK. BY

AD7414/AD7415

ACK. BY

AD7414/AD7415

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

ADDRESS POINTER REGISTER BYTE

1

9

• • •

SCL (CONTINUED)

SDA (CONTINUED)

D6

D5

D3

D2

D1

D0

D7

D4

ACK. BY

STOP BY

AD7414/AD7415 MASTER

FRAME 3

DATA BYTE

Figure 11. Writing to the Address Pointer Register Followed by a Single Byte of Data to the Selected Register

SCL

SDA

0

1

A2

A1

A0

D7

D6

D5

D4

D3

D2

D1

D0

1

R/W

START BY

MASTER

ACK. BY

AD7414/AD7415

NO ACK. BY STOP BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

SINGLE DATA BYTE FROM AD7414/AD7415

Figure 12. Reading a Single Byte of Data from a Selected Register

1

9

1

9

• • •

SCL

SDA

• • •

0

1

A2

A1

A0

R/W

D15

D14

D13

D12

D10

D11

D9

D8

0

START BY

MASTER

ACK. BY

AD7414/AD7415

ACK. BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

MOST SIGNIFICANT DATA BYTE FROM AD7414/AD7415

9

1

SCL (CONTINUED)

SDA (CONTINUED)

• • •

D6

D5

D3

D2

D1

D0

D7

D4

NO ACK. BY STOP BY

MASTER

FRAME 3

LEAST SIGNIFICANT DATA BYTE FROM AD7414/AD7415

Figure 13. Reading Two Bytes of Data from the Temperature Value Register

Rev. E | Page 11 of 20

ꢂ74ꢀ4/ ꢂ74ꢀ.C

SERI LCINTERF °E

Control of the AD7414/AD7415 is carried out via the I²C-

compatible serial bus. The AD7414/AD7415 are connected to

this bus as slave device, under the control of a master device,

such as the processor.

Any number of bytes of data may be transferred over the serial

bus in one operation, but it is not possible to mix read and write

in one operation. The type of operation is determined at the

beginning and cannot then be changed without starting a new

operation.

SERIAL BUS ADDRESS

Like all I²C-compatible devices, the AD7414/AD7415 have a

7-bit serial address. The four MSBs of this address for the

AD7414/AD7415 are set to 1001. The AD7414/AD7415 are

available in four versions: AD7414/AD7415-0, AD7414/

AD7415-1, AD7414-2, and AD7414-3. The first two versions

have three different I²C addresses available, which are selected

by either tying the AS pin to GND, to V_DD, or letting the pin

float (see Table 4). By giving different addresses for the four

versions, up to eight AD7414s or six AD7415s can be connected

to a single serial bus, or the addresses can be set to avoid

conflicts with other devices on the bus.

WRITE MODE

Depending on the register being written to, there are two

different writes for the AD7414/AD7415.

Writing to the Address Pointer Register for a Subsequent

Read

In order to read data from a particular register, the address

pointer register must contain the address of that register. If it

does not, the correct address must be written to the address

pointer register by performing a single-byte write operation, as

shown in Figure 10. The write operation consists of the serial

bus address followed by the address pointer byte. No data is

written to any of the data registers. A read operation is then

performed to read the register.

The serial bus protocol operates as follows.

The master initiates data transfer by establishing a START

condition, defined as a high-to-low transition on the serial data

line SDA, while the serial clock line SCL remains high. This

indicates that an address/data stream follows. All slave periph-

erals connected to the serial bus respond to the START condi-

tion and shift in the next eight bits, consisting of a 7-bit address

Writing a Single Byte of Data to the Configuration

Register,T_HIGHRegister, or T_LOWRegister

All three registers are 8-bit registers, so only one byte of data

can be written to each register. Writing a single byte of data to

one of these registers consists of the serial bus address, the data

register address written to the address pointer register, followed

by the data byte written to the selected data register. This is

illustrated in Figure 11.

(MSB first) plus an R/ bit, which determines the direction of

W

the data transfer and whether data is written to or read from the

slave device.

The peripheral whose address corresponds to the transmitted

address responds by pulling the data line low during the low

period before the ninth clock pulse, known as the acknowledge

bit. All other devices on the bus remain idle while the selected

READ MODE

Reading data from the AD7414/AD7415 is a 1- or 2-byte

operation. Reading back the contents of the configuration

register, the T_HIGHregister, or the T_LOWregister is a single-byte

read operation, as shown in Figure 12. The register address was

previously set up by a single-byte write operation to the address

pointer register. Once the register address has been set up, any

number of reads can subsequently be performed from that

register without having to write to the address pointer register

again. To read from another register, the address pointer

register has to be written to again to set up the relevant register

address.

device waits for data to be read from or written to it. If the R/

W

bit is 0, the master writes to the slave device. If the R/ bit is 1,

W

the master reads from the slave device.

Data is sent over the serial bus in sequences of nine clock

pulses, eight bits of data followed by an acknowledge bit from

the receiver of data. Transitions on the data line must occur

during the low period of the clock signal and remain stable

during the high period, because a low-to-high transition when

the clock is high may be interpreted as a STOP signal.

Reading data from the temperature value register is a 2-byte

operation, as shown in Figure 13. The same rules apply for a

2-byte read as a 1-byte read.

When all data bytes have been read or written, stop conditions

are established. In WRITE mode, the master pulls the data line

high during the 10th clock pulse to assert a STOP condition. In

READ mode, the master device pulls the data line high during

the low period before the ninth clock pulse. This is known as

No Acknowledge. The master then takes the data line low

during the low period before the 10th clock pulse, then high

during the 10th clock pulse to assert a STOP condition.

Rev. E | Page 12 of 20

C

ꢂ74ꢀ4/ ꢂ74ꢀ.

SMBUS ALERT

OPERATING MODES

The AD7414 ALERT output is an SMBus interrupt line for

devices that want to trade their ability to master for an extra

pin. The AD7414 is a slave-only device and uses the SMBus

ALERT to signal to the host device that it wants to talk. The

SMBus ALERT on the AD7414 is used as an overtemperature

indicator.

Mode 1

This is the power-on default mode of the AD7414/AD7415. In

this mode, the AD7414/AD7415 does a temperature conversion

every 800 ms and then partially powers down until the next

conversion occurs.

If a one-shot operation (setting D2 of the configuration register

to a 1) is performed between automatic conversions, a conver-

sion is initiated right after the write operation. After this

conversion, the part returns to performing a conversion every

800 ms.

The ALERT pin has an open-drain configuration that allows the

ALERT outputs of several AD7414s to be wire-AND’ed together

when the ALERT pin is active low. Use D4 of the configuration

register to set the active polarity of the ALERT output. The

power-up default is active low. The ALERT function can be

disabled or enabled by setting D5 of the configuration register

to 1 or 0, respectively.

Depending on where a serial port access occurs during a

conversion, that conversion might be aborted. If the conversion

is completed before the part recognizes a serial port access, the

temperature register is updated with the new conversion. If the

conversion is completed after the part recognizes a serial port

access, the internal logic prevents the temperature register from

being updated, because corrupt data could be read.

The host device can process the ALERT interrupt and

simultaneously access all SMBus ALERT devices through the

alert response address. Only the device that pulled the ALERT

low acknowledges the Alert Response Address (ARA). If more

than one device pulls the ALERT pin low, the highest priority

(lowest address) device wins communication rights via standard

I²C arbitration during the slave address transfer.

A temperature conversion can start anytime during a serial port

access (other than a one-shot operation), but the result of that

conversion is loaded into the temperature register only if the

serial port access is not active at the end of the conversion.

The ALERT output becomes active when the value in the

temperature value register exceeds the value in the T_HIGH

register. It is reset when a write operation to the configuration

register sets D3 to 1 or when the temperature falls below the

value stored in the T_LOWregister.

Mode 2

The only other mode in which the AD7414/AD7415 operates is

the full power-down mode. This mode is usually used when

temperature measurements are required at a very slow rate. The

power consumption of the part can be greatly reduced in this

mode by writing to the part to go to a full power-down. Full

power-down is initiated right after D7 of the configuration

register is set to 1.

The ALERT output requires an external pull-up resistor. This

can be connected to a voltage different from V_DD, provided the

maximum voltage rating of the ALERT output pin is not

exceeded. The value of the pull-up resistor depends on the

application, but it should be as large as possible to avoid

excessive sink currents at the ALERT output, which can heat the

chip and affect the temperature reading.

When a temperature measurement is required, a write

operation can be performed to power up the part and put it into

one-shot mode (setting D2 of the configuration register to a 1).

The power-up takes approximately 4 µs. The part then performs

a conversion and is returned to full power-down. The

temperature value can be read in the full power-down mode,

because the serial interface is still powered up.

POWER-ON DEFAULTS

The AD7414/AD7415 always power up with these defaults:

Address pointer register pointing to the temperature value

register.

T_HIGHregister loaded with 7Fh.

T_LOWregister loaded with 80h.

Configuration register loaded with 40h.

Note that the AD7415 does not have any T_HIGHor T_LOWregisters.

Rev. E | Page 13 of 20

ꢂ74ꢀ4/ ꢂ74ꢀ.C

typically 4 µs contributes 199.3 nW to the overall power

dissipation in the following way:

POWER VS. THROUGHPUT

The two modes of operation for the AD7414/AD7415 produce

different power vs. throughput performances. Mode 2 is the

sleep mode of the part, and it achieves the optimum power

performance.

(29 µs/800 ms) × (5 V × 1.1 mA) = 199.3 nW

The contribution to the total power dissipated by the remaining

time is 3.9 µW.

Mode 1

(799.971 ms/800 ms) × (5 V × 800 nA) = 3.9 µW

Thus the total power dissipated during each cycle is:

199.3 nW + 3.9 µW = 940.16 µW

In this mode, continuous conversions are performed at a rate of

approximately one every 800 ms. Figure 14 shows the times and

currents involved with this mode of operation for a 5 V supply.

At 5 V, the current consumption for the part when converting is

1.1 mA typically, and the quiescent current is 188 µA typically.

The conversion time of 25 µs plus power-up time of typically

4 µs contributes 199.3 nW to the overall power dissipation in

the following way:

1.1mA

I

DD

800nA

800ms

TIME

(29 µs/800 ms) × (5 × 1.1 mA) = 199.3 nW

29µs

The contribution to the total power dissipated by the remaining

time is 939.96 µW.

Figure 15. Mode 2 Power Dissipation

(799.97 ms/800 ms) × (5 × 1.1 µA) = 199.3 µW

Thus the total power dissipated during each cycle is

199.3 nW + 939.96 µW = 940.16 µW

MOUNTING THE AD7414/AD7415

The AD7414/AD7415 can be used for surface or air tempera-

ture sensing applications. If the device is cemented to a surface

with thermally conductive adhesive, the die temperature is

within about 0.1°C of the surface temperature, due to the

device’s low power consumption. Care should be taken to

insulate the back and leads of the device from the air if the

ambient air temperature is different from the surface

temperature being measured.

1.1mA

I

DD

188µA

29µs

800ms

The ground pin provides the best thermal path to the die, so the

temperature of the die is close to that of the printed circuit

ground track. Care should be taken to ensure that this is in

good thermal contact with the surface being measured.

TIME

Figure 14. Mode 1 Power Dissipation

Mode 2

In this mode, the part is totally powered down. All circuitry

except the serial interface is switched off. The most power

efficient way of operating in this mode is to use the one-shot

method. Write to the configuration register and set the one-shot

bit to a 1. The part powers up in approximately 4 µs and then

performs a conversion. Once the conversion is finished, the

device powers down again until the PD bit in the configuration

register is set to 0 or the one-shot bit is set to 1. Figure 15 shows

the same timing as Figure 14 in mode 1; a one-shot is initiated

every 800 ms. If we take the voltage supply to be 5 V, we can

work out the power dissipation in the following way. The

current consumption for the part when converting is 1.1 mA

typically, and the quiescent current is 800 nA typically. The

conversion time of 25 µs plus the power-up time of

As with any IC, the AD7414/AD7415 and their associated

wiring and circuits must be kept free from moisture to prevent

leakage and corrosion, particularly in cold conditions where

condensation is more likely to occur. Water-resistant varnishes

and conformal coatings can be used for protection. The small

size of the AD7414/AD7415 packages allows them to be

mounted inside sealed metal probes, which provide a safe

environment for the devices.

SUPPLY DECOUPLING

The AD7414/AD7415 should at least be decoupled with a 0.1µF

ceramic capacitor between V_DDand GND. This is particularly

important if the AD7414/AD7415 are mounted remote from

the power supply.

Rev. E | Page 14 of 20

C

ꢂ74ꢀ4/ ꢂ74ꢀ.

TEMPERATURE ACCURACY VS. SUPPLY

TYPICAL TEMPERATURE ERROR GRAPH

The temperature accuracy specifications are guaranteed for

voltage supplies of 3 V and 5.5 V only. Figure 16 gives the

typical performance characteristics of a large sample of parts

over the full voltage range of 2.7 V to 5.5 V. Figure 17 gives the

typical performance characteristics of one part over the full

voltage range of 2.7 V to 5.5 V.

Figure 18 shows the typical temperature error plots for one

device with V_DDat 3.3 V and at 5.5 V.

4

3

2

5.5V

4

3

2

1

0

–1

–40°C

3.3V

1

–2

–3

0

+40°C

–1

–4

–40 –30–20 –10

0

10 20 30 40 50 60 70 80 90 95 100 110 125

TEMPERATURE (°C)

+85°C

–2

Figure 18. Typical Temperature Error @ 3.3 V and 5.5 V

–3

–4

Figure 19 shows a histogram of the temperature error at

ambient temperature (40°C) over approximately 6,000 units.

Figure 19 shows that over 70% of the AD7414/AD7415 devices

tested have a temperature error within 0.3°C.

2.7

3.0

5.5

SUPPLYVOLTAGE (V)

Figure 16. Typical Temperature Error vs. Supply for Large Sample of Parts

900

4

3

AMBIENT TEMPERATURE = 40°C

800

700

600

500

400

300

200

100

0

2

–40°C

1

0

+40°C

–1

+85°C

–2

–3

–4

2.7

5.5

–1.08 –0.81 –0.54 –0.27

0

0.27

0.54

0.81

1.08

3.3

5.0

SUPPLYVOLTAGE(V)

TEMPERATURE ERROR (°C)

Figure 19. Ambient Temperature Error @ 3 V

Figure 17. Typical Temperature Error vs. Supply for One Part

Rev. E | Page 1ꢀ of 20

ꢂ74ꢀ4/ ꢂ74ꢀ.C

OUTLINECꢂIMENSIONSC

2.90 BSC

3.00

BSC

6

1

5

2

4

3

2.80 BSC

1.60 BSC

8

1

5

4

4.90

BSC

3.00

BSC

PIN 1

INDICATOR

0.95 BSC

1.90

BSC

PIN 1

1.30

1.15

0.90

0.65 BSC

1.45 MAX

1.10 MAX

0.15

0.00

0.22

0.08

0.80

0.60

0.40

10°

4°

0°

0.60

0.45

0.30

8°

0°

0.50

0.30

0.38

0.22

0.15 MAX

0.23

0.08

SEATING

PLANE

COPLANARITY

0.10

SEATING

PLANE

COMPLIANT TO JEDEC STANDARDS MO-178AB

COMPLIANT TO JEDEC STANDARDS MO-187-AA

Figure 20. 6-Lead Small Outline Transistor Package [SOT-23]

Figure 21. 8-Lead Mini Small Outline Package [MSOP]

(RM-8)

(RT-6)

Dimensions shown in millimeters

2.90 BSC

5

4

3

2.80 BSC

1.60 BSC

2

PIN 1

0.95 BSC

1.90

BSC

1.30

1.15

0.90

1.45 MAX

0.22

0.08

10°

5°

0°

0.15 MAX

0.50

0.30

0.60

0.45

0.30

SEATING

PLANE

COMPLIANT TO JEDEC STANDARDS MO-178AA

Figure 22. 5-Lead Small Outline Transistor Package [SOT-23]

(RT-5)

Dimensions shown in millimeters

Rev. E | Page 16 of 20

C

ꢂ74ꢀ4/ ꢂ74ꢀ.

ORDERING GUIDE

Temperature

Range

Typ Temperature Package Package

Minimum

Branding Quantities/Reel

Model

Error @ 3 V

2°C

Option

RT-6

RM-8

RT-6

RM-8

RT-6

RT-ꢀ

Description

AD7414ART-0REEL7

AD7414ART-0REEL

AD7414ART-0ꢀ00RL7

AD7414ARTZ-0REEL7¹

AD7414ARTZ-0REEL¹

AD7414ARTZ-0ꢀ00RL7¹

AD7414ARM-0REEL7

AD7414ARM-0REEL

AD7414ARM-0

−40°C to +12ꢀ°C

6-Lead SOT-23

8-Lead MSOP

6-Lead SOT-23

8-Lead MSOP

6-Lead SOT-23

ꢀ-Lead SOT-23

CHA

#CHA

CHA

TOL

3,000

10,000

ꢀ00

3,000

10,000

ꢀ00

3,000

10,000

AD7414ARMZ-0REEL7¹

AD7414ARMZ-0REEL¹

AD7414ARMZ-0¹

3,000

10,000

TOL

AD7414ART-1REEL7

AD7414ART-1REEL

AD7414ART-1ꢀ00RL7

AD7414ARTZ-1REEL7¹

AD7414ARTZ-1REEL¹

AD7414ARTZ-1ꢀ00RL7¹

AD7414ARM-1REEL7

AD7414ARM-1REEL

AD7414ARM-1

CHB

TOH

CHB

TOH

CHC

TOJ

3,000

10,000

ꢀ00

3,000

10,000

ꢀ00

3,000

10,000

AD7414ARMZ-1REEL7¹

AD7414ARMZ-1REEL¹

AD7414ARMZ-1¹

3,000

10,000

AD7414ART-2REEL7

AD7414ART-2REEL

AD7414ARTZ-2REEL7¹

AD7414ARTZ-2REEL¹

AD7414ART-3REEL7

AD7414ART-3REEL

AD7414ARTZ-3REEL7¹

AD7414ARTZ-3REEL¹

AD741ꢀART-0REEL7

AD741ꢀART-0REEL

AD741ꢀART-0ꢀ00RL7

AD741ꢀARTZ-0REEL7¹

AD741ꢀARTZ-0REEL¹

AD741ꢀARTZ-0ꢀ00RL7¹

AD741ꢀART-1REEL7

AD741ꢀART-1REEL

AD741ꢀART-1ꢀ00RL7

AD741ꢀARTZ-1REEL7¹

AD741ꢀARTZ-1REEL¹

AD741ꢀARTZ-1ꢀ00RL7¹

EVAL-AD7414/1ꢀEB

3,000

10,000

3,000

10,000

3,000

10,000

3,000

10,000

3,000

10,000

ꢀ00

3,000

10,000

ꢀ00

3,000

10,000

ꢀ00

TOJ

CHD

TOK

CGA

#CGA

CGB

#CGB

3,000

10,000

ꢀ00

Evaluation

Board

¹Z = Pb-free part.

Rev. E | Page 17 of 20

ꢂ74ꢀ4/ ꢂ74ꢀ.C

NOTESC

Rev. E | Page 18 of 20

C

ꢂ74ꢀ4/ ꢂ74ꢀ.

NOTESC

Rev. E | Page 19 of 20

ꢂ74ꢀ4/ ꢂ74ꢀ.C

NOTESC

Purchase of licensed I²C components of Analog Devices or one of its sublicensed Associated Companies conveys a license for the purchaser under the Philips I²C Patent

Rights to use these components in an I²C system, provided that the system conforms to the I²C Standard Specification as defined by Philips.

©

registered trademarks are the property of their respective owners.

C02463-0-4/05(E)

Rev. E | Page 20 of 20


型号：	AD7414ART-1REEL
厂家：	Rochester Electronics
描述：	Serial Switch/Digital Sensor, 10 Bit(s), 3Cel, Rectangular, Surface Mount, PLASTIC, MO-178AB, SOT-23, 6 PIN 输出元件传感器换能器
文件：	总21页 (文件大小：1667K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

AD7414ART-1REEL [ROCHESTER]

相关型号：

AD7414ART-1REEL7

AD7414ART-1REEL7

AD7414ART-2REEL

AD7414ART-2REEL7

AD7414ART-2REEL7

AD7414ART-3REEL

AD7414ART-3REEL

AD7414ART-3REEL7

AD7414ART-3REEL7

AD7414ARTZ-0500RL7

AD7414ARTZ-0REEL

AD7414ARTZ-0REEL7