AD7415SRT-2REEL7 [ADI]
Switch/Digital Output Temperature Sensor, DIGITAL TEMP SENSOR-SERIAL, 10BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT, PLASTIC, SOT-23, 5 PIN;
| 型号： | AD7415SRT-2REEL7 |
| 厂家： | 
ADI |
| 描述： | Switch/Digital Output Temperature Sensor, DIGITAL TEMP SENSOR-SERIAL, 10BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT, PLASTIC, SOT-23, 5 PIN 输出元件 传感器 换能器 |
| 文件： | 总11页 (文件大小：136K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SMBus/I2CCompatible,10-bitDigital
TemperatureSensorin5PinSOT-23
a
Preliminary Technical Data
AD7415
FEATURES
F U NC T IO NAL B LO C K D IAG RAM
10-Bit Tem perature to Digital Converter.
Tem perature range:
-55oC to +135oC
-55oC to +125oC
Accuracy of ±2oC
SMBusTM/ I2CR Com patible Serial Interface
25µA Supply Current
Tem perature Conversion Tim e - 25µs typ
Space Saving 5-pin SOT-23 Package
Pin-Selectable Addressing via AS
Four Versions Allow Eight I2C Addresses
C O
N
F I G
U R A T I O N
R
E G I S T E
R
APPLICATIONS
Hard Disk Drives
Personal Com puters
Electronic Test Equipm ent
Office Equipm ent
Dom estic Appliances
Process Control
Cellular Phones
G E NE R AL D E S C R IP T IO N
P R O D U C T H IG H LIG H T S
T he AD7415 is a complete temperature monitoring sys-
tem in a 5-pin SOT -23 package. It contains a bandgap
temperature sensor and a 10-bit ADC to monitor and
digitize the temperature reading to a resolution of 0.25oC.
1. T he AD7415 has an on chip temperature sensor that
allows an accurate measurement of the ambient tem-
perature to be made. T he measurable temperature range
is -55oC to +135oC with a ±3oC temperature accuracy
over the full temperature range.
2. SMBus/I2C Compatible Serial Interface with pin
selectable choice of three addresses per version of the
AD7415, eight address options in total.
T he AD7415 provides a two-wire serial interface which is
compatible with SMBus and I2C interfaces. T he part
comes in four versions, AD7415-0, AD7415-1, AD7415-2
and the AD7415-3. T he AD7415-0 & AD7415-1 versions
allow for the choice of three different SMBus addresses
for each version. All four versions give the possibility of
eight different I2C addresses for the AD7415.
3. Supply voltage of 2.7V to 5.5V.
4. Space saving 5-Pin SOT -23 package.
5. 10-bit temperature reading to 0.25oC resolution.
T he AD7415’s 3.3V supply voltage, low supply current,
serial interface and small package size, make it ideal for a
variety of applications, including personal computers,
cellular phones, office equipment and domestic appli-
ances.
SMBus is a trademark and I2C is a registered trademark of Philips Corporation
REV. PrB 05/’00
Inform ation furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assum ed by Analog Devices for its
use, nor for any infringem ents of patents or other rights of third parties
which m ay result from its use. No license is granted by im plication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.
Tel: 781/ 329-4700
Fax: 781/ 326-8703
World Wide Web Site: http:/ / w w w.analog.com
Analog Devices, Inc., 2000
1
(T = TMIN to T , V = 2.7V to 5.5V, unless otherwise noted)
A
MAX DD
AD7415–SPECIFICATIONS
P a r a m et er
A Ver sion
S Ver sion
U n it s
T est C on d ition s/C om m en ts
T E M P E RAT URE SE NSO R AND AD C
Accuracy
± 2.0
oC max
oC max
Bits
T A = -55oC to +125oC
T A = -55oC to +135oC
± 3.0
10
400
25
Resolution
Update Rate, tR
T emperature C onversion T ime
10
400
25
µs typ
s typ
µ
P O WE R SU P P LIE S
Supply Current
1.2
25
1.2
25
mA max
Peak current when part is
converting.
Average Supply Current with
serial bus inactive. Not convert-
ing.
Supply Current2
µ
A
A
Supply Current3
60
60
µ
Average Supply Current with
serial bus active. Not converting
D IG IT AL INP U T
Input High Voltage, VIH
Input Low Voltage, VIL,
Input Current, IIN
2.4
0.8
± 1
10
2.4
0.8
± 1
10
V min
V max
µA max VIN = 0V to VDD
Input Capacitance, CIN
pF max All D igital Inputs
D IG IT AL O U T P U T
Output High Current, IOH
Output Low Voltage, VOL
Output Capacitance, COUT
1
0.4
50
1
0.4
50
µA max VOH = 5V
V max
IOL = 1.6mA
pF max
AC E LE C T RIC AL C H ARAC T E RIST IC S4
Serial Clock Period, t1
Data In Setup T ime to SCL High, t2
Data Out Stable after SCL Low, t3
SDA Low Setup T ime to SCL Low
(Start Condition), t4
SDA H igh H old T ime after SCL H igh
(Stop Condition), t5
SDA and SCL Fall T ime, t6
2.5
50
0
2.5
50
0
µ
s min
See Figure 1
See Figure 1
See Figure 1
ns min
ns min
50
50
ns min
ns min
See Figure 1
See Figure 1
50
90
50
90
ns max See Figure 1
Specifications subject to change without notice.
NOTES
1
2
T emperature Ranges as follows: A Version = -55oC to +125oC, B Version = -55oC to +135oC.
Peak supply current is approximately 1.2mA with serial bus inactive and part converting. T his peak supply current is required for 25us (the conversion time) out of every
400us (the conversion rate).
3
4
Peak supply current is approximately 1.2mA with serial bus active and part converting. T he 60uA average current is derived assuming a 400kHz serial clock being active
for 16 serial clock cycles every 400us. If the temperature read is at a lower rate, the average current will reduce accordingly.
T he SDA & 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 affect on the EMC behaviour of the part.
t
1
SCL
t
t
t
2
5
4
SDA
DATA IN
t
3
SDA
DATA O UT
t
6
Figure 1. Diagram for Serial Bus Tim ing
–2–
REV. PrB
Preliminary Technical Data
AD7415
AD 7415 P IN F UNC T IO N D E SC RIP T IO N
P IN C O NF IG U R AT IO NS
Mnem onic
G N D
Description
Analog and D igital Ground.
AS
Logic Input. Address Select Input which
selects one of three I2C addresses for the
AD7415 (See T able 1).
1
2
3
5
AS
SDA
AD7415
Top View
VD D
S C L
SD A
Positive Supply Voltage, +2.7V to +5.5V.
Digital Input. Serial Bus Clock.
GND
(Not to Scale)
D igital I/O. Serial Bus Bi-directional
Data. Open-drain output.
V
DD
4
SCL
SOT-23
AB SO LUT E M AXIM UM RAT ING S*
(T A = +25°C unless otherwise noted)
VDD to GND......................................... -0.3 V to +7 V
SD A Input Voltage to GN D .............
SD A Output Voltage to GN D ..........
SCL Input Voltage to GND..........
Operating T emperature Range ..........
Storage T emperature Range .............
-0.3 V to +7 V
-0.3 V to +7 V
-0.3 V to +7 V
-55°C to +150°C
-65°C to +150°C
Junction T emperature .................................... +150°C
SOT -23, Power Dissipation ......................... 450 mW
θJA T hermal Impedance ................................. 240°C/W
Lead T emperature, Soldering
Vapor Phase (60 sec) .............................
Infrared (15 sec) ...................................
+215°C
+220°C
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. T his 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 mayaffect device reliability.
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
the AD7415 features proprietary ESD protection circuitry, permanent damage may occur on devices
subjected to high energy electrostatic discharges. T herefore, proper ESD precautions are recom-
mended to avoid performance degradation or loss of functionality.
REV. PrB
–3–
Preliminary Technical Data
AD7415
O R D E R ING G U ID E
T em per atu r e
Range
T em per atu r e
Error
P ackage
D escr iption
Br anding
Min Q ty’s/
Reel
Model
Infor m ation
for Silicon 1
sam ples
AD 7415ART -0REEL7
AD 7415ART -0REEL
-55oC to +125oC
-55oC to +125oC
± 2°C
± 2°C
5-Pin SOT -23
5-Pin SOT -23
C G 1
C G 1
3000
10000
AD 7415ART -1REEL7
AD 7415ART -1REEL
-55oC to +125oC
-55oC to +125oC
± 2°C
± 2°C
5-Pin SOT -23
5-Pin SOT -23
C G 2
C G 2
3000
10000
AD 7415ART -2REEL7
AD 7415ART -2REEL
-55oC to +125oC
-55oC to +125oC
± 2°C
± 2°C
5-Pin SOT -23
5-Pin SOT -23
C G 3
C G 3
3000
10000
AD 7415ART -3REEL7
AD 7415ART -3REEL
-55oC to +125oC
-55oC to +125oC
± 2°C
± 2°C
5-Pin SOT -23
5-Pin SOT -23
C G 4
C G 4
3000
10000
AD 7415SRT -0REEL7
AD 7415SRT -1REEL7
AD 7415SRT -2REEL7
AD 7415SRT -3REEL7
-55oC to +135oC
-55oC to +135oC
-55oC to +135oC
-55oC to +135oC
± 3°C
± 3°C
± 3°C
± 3°C
5-Pin SOT -23
5-Pin SOT -23
5-Pin SOT -23
5-Pin SOT -23
C G 5
C G 6
C G 7
C G 8
3000
3000
3000
3000
Table 1. I2C Addr ess Selection
P ar t Num ber
AS P in
I2C Addr ess
AD 7415-0
AD 7415-0
AD 7415-0
F loat
G N D
VD D
1001 000
1001 001
1001 010
AD 7415-1
AD 7415-1
AD 7415-1
F loat
G N D
VD D
1001 100
1001 101
1001 110
AD 7415-2
AD 7415-3
N /A
N /A
1001 011
1001 111
–4–
REV. PrB
Preliminary Technical Data
C IR C U IT INF O R M AT IO N
AD7415
M E AS U R E M E NT T E C H NIQ U E
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 out the effect of the absolute value of VBE, which
varies from device to device.
T he AD7415 is a stand alone digital temperature sensor.
T he on-chip temperature sensor allows an accurate mea-
surement of the ambient device temperature to be made.
T he 10-bit A/D converter converts the temperature mea-
sured into a two’s complement format for storage in the
T emperature Register. T he A/D converter is made up of a
conventional succesive-approximation converter based
around a capacitior DAC. T he serial interface is I2C and
SMBus compatible. T he AD7415 requires a 2.7 V to 5.5
V power supply. T he temperature sensor has a working
measurement range of -55 oC to +125 oC for version A
and -55 oC to +135 oC for version S.
T he technique used in the AD7415 is to measure the
change in VBE when the device is operated at two different
currents.
T his is given by:
∆VBE = KT/q x ln (N)
where:
F U NC T IO NAL D E S C R IP T IO N
K is Boltzmann’s constant
T emperature measurement is initiated by a couple of
methods. T he first method uses an internal clock count-
down of 400µs and then a conversion is preformed. It
takes typically 25µs for each conversion to be completed.
T he new temperature value is loaded into the T empera-
ture Value Register and ready for reading by the I2C inter-
face.
q is charge on the electron (1.6 x 10-19 Coulombs).
T is absolute temperature in Kelvins.
N is the ration of the two currents.
V
DD
A temperature measurement is also initiated every time a
read or write operation to the AD7415 takes place. T he
track/hold goes into hold appromimaely 3µs after the
ST OP contition and a conversion is then initiated. T ypi-
cally 25µs later the conversion is complete and the T em-
perature Value Register is loaded with a new temperature
value.
N x I
I
V
O UT+
TO ADC
SENSING
Configuration functions consist of:
- switching between normal operation and full power-
down.
TRANSISTOR
V
O UT-
SENSING
TRANSISTOR
- enabling or disabling the SCL and SDA filters.
SUP PLY
2.7
5.5
V
V
to
Figure 3. Tem perature Measurem ent Technique
10µF
0.1µF
VD D
SDA
SC L
AS
Figure 3 shows the method the AD7415 uses to measure
the ambient device temperature. T o measure ∆VBE, the
sensor (substrate transistor) is switched between operating
currents of I and N x I. T he resulting waveform is passed
through a chopper-stabilized amplifier that performs the
functions of amplification and rectification of the wave-
form to produce a dc voltage proportional to ∆VBE. T his
voltage is measure by the ADC to give a temperature out-
put in 10-bit twos complement format.
µC/µP
GN D
AD 7415
Figure 2. Typical Connection Diagram
T E M P E RAT URE D AT A F O RM AT
T he temperature resolution of the ADC is 0.25oC which
corresponds to one LSB of the ADC. T he ADC can theo-
retically measure a temperature span of 255oC; the practi-
cal lowest value is limited to -55oC due to device
maximum ratings. T he S grade can measure a tempera-
ture range of -55oC to +135oC (temperature data format is
shown in T able 2); the A grade can measure a temperature
range of -55oC to +125oC (temperature data format is
shown in T able 3).
REV. PrB
–5–
Preliminary Technical Data
AD7415
INT E RNAL RE G IST E R ST RU C T U RE
Table 2. S-Gr ade Tem per atur e D ata For m at
T he AD7415 has three internal registers as shown in Fig-
ure 4. T wo are data registers and one is an address pointer
register. Each data register has an address which is
pointed to by the Address Pointer register when communi-
cating with it. T he T emperature Value register is the only
data register that is read only.
Tem perature
D igital O utput
DB9........DB0
-55 °C
10 1100 0000
10 1101 0100
11 0011 1000
11 1001 1100
11 1111 1111
00 0000 0000
00 0000 0001
00 0110 0100
00 1100 1000
01 0010 1100
01 1001 0000
01 1011 1000
-50 °C
-25 °C
0 °C
+24.75 °C
+25 °C
+25.25 °C
+50 °C
+75 °C
+100 °C
+125 °C
+135 °C
TEM PERATURE
VALUE
REGIST ER
ADDRESS
PO INT ER
REGIST ER
DATA
CONF IG URAT ION
REGISTER
SDA
SERIAL BUS INTERFACE
SCL
S-Grade T emperature Conversion Formula :-
(1) T emperature = +25°C + (ADC Code*/4)
(2) T emperature = (ADC Code* - 412)/4
Figure 4. AD7415 Register Structure
* When DB9 = 0, use formula (1). Use DB0 - DB8 in formula.
When DB9 = 1, use formula (2). Use DB0 - DB8 in formula.
Table 3. A-Gr ade Tem per atur e D ata For m at
Tem per atur e
D igital O utput
D B9.............D B0
AD D RE SS P O INT E R RE G IST E R
T he Address Pointer Register is an 8-bit register which
stores an address that points to one of the two data regis-
ters. T he first byte of every serial write operation to the
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 to
or read from. Only the two LSBs of this register are used
to select a data register.
-128 °C
-125 °C
-100 °C
-75 °C
10 0000 0000
10 0000 1100
10 0111 0000
10 1101 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
01 1111 1100
-50 °C
-25 °C
-0.25 °C
0 °C
Table 4. Addr ess P ointer Register
P 7*
P 6*
P 5*
P 4*
P 3*
P 2*
P 1
P 0
+0.25 °C
+10 °C
+25 °C
+50 °C
+75 °C
+100 °C
+125 °C
+127 °C
0
0
0
0
0
0
Register Select
Table 5. Register Addr ess
P 1
0
P 0
0
Registers
T emperature Value Register (Read only)
C onfiguration Register (Read/Write)
0
1
A-Grade T emperature Conversion Formula :-
(1) Positive T emperature = ADC Code/4
(2) Negative T emperature = (ADC Code* - 512)/4
*DB9 is removed from the ADC Code.
–6–
REV. PrB
Preliminary Technical Data
AD7415
C O NF IG U RAT IO N RE G IST E R (AD D RE SS 01H )
T he Configuration Register is an 8-bit read/write register
that is used to set the operating modes of the AD7415.
Only four of the MSBs are used (D7 to D4) to set the
operating modes, see T able 7. D0 to D5 are used for fac-
tory settings and must have zeros written to them during
normal operation.
sions, up to eight AD7415’s can be connected to a single,
serial bus, or the addresses can be set to avoid conflicts
with other devices on the bus.
T he serial bus protocol operates as follows:
1. T he master initiates data transfer by establishing a
ST ART condition, defined as a high to low transition
on the serial data line SDA whilst the serial clock line
SCL remains high. T his indicates that an address/data
stream will follow. All slave peripherals connected to
the serial bus respond to the ST ART condition, and
shift in the next 8 bits, consisting of a 7-bit address
(MSB first) plus a R/W bit, which determines the direc-
tion of the data transfer, i.e. whether data will be writ-
ten to or read from the slave device.
Table 6. Configur ation Register
D7
PD
0 *
D6
D5
D4
D3
D2 D1 D0
FLTR
1 *
T EST MODE
0’s*
*Default settings at Power-up.
T he peripheral whose address corresponds to the trans-
mitted 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 now remain idle whilst the selected device waits for
data to be read from or written to it. If the R/W bit is a
0 then the master will write to the slave device. If the
R/W bit is a 1 the master will read from the slave de-
vice.
Table 7.
Configur ation Register Settings
D 7
D 6
Full Power-down if = 1
Bypass SDA & SCL filtering if = 0
2. Data is sent over the serial bus in sequences of 9 clock
pulses, 8 bits of data followed by an Acknowledge Bit
from the receiver of data. T ransitions on the data line
must occur during the low period of the clock signal
and remain stable during the high period, as a low to
high transition when the clock is high may be inter-
preted as a ST OP signal.
T E M P E RAT U RE VALU E RE G IST E R
T he T emperature Value Register is a 10-bit read-only
register which stores the temperature reading from the
ADC in twos complement format. T wo reads are neces-
sary to read data from this register. T he full theoretical
span of the ADC is 255oC, but in practice the temperature
measurement range is limited to the operating range of the
device, -55oC to +125oC for A-grade and -55oC to
+135oC for S-grade.
3. When all data bytes have been read or written, stop
conditions are established. In WRIT E mode, the master
will pull the data line high during the 10th clock pulse
to assert a ST OP condition. In READ mode, the mas-
ter device will pull the data line high during the low
period before the 9th clock pulse. T his is known as No
Acknowledge. T he master will then take the data line
low during the low period before the 10th clock pulse,
then high during the 10th clock pulse to assert a ST OP
condition.
Table 8.
D14
Tem per atur e Value Register (Fir st Read)
D15
D13
D12
D11
D10
D9
D8
M S B
B8
B7
B6
B5
B4
B3
B2
Table 9.
Tem per atur e Value Register (Second Read)
D7
D6
D5
D4
D3
D2
D1
D0
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, because the type of opera-
tion is determined at the beginning and cannot subse-
quently be changed without starting a new operation.
B1
L S B
N /A
N /A
N /A
N /A
N /A
N /A
AD 7415 SE RIAL INT E RF AC E
Control of the AD7415 is carried out via the I2C-compat-
ible serial bus. T he AD7415 is connected to this bus as a
slave device, under the control of a master device, e.g. the
processor.
WRITING TO TH E AD 7415
T here are two different writes for the AD7415. One is for
reading from either the Configuration Register or the
T emperature Value Register. T he other is for writing to
the Configuration Register only.
SE RIAL BUS AD D RE SS
Like all I2C-compatible devices, the AD7415 has a 7-bit
serial address. T he four MSBs of this address for the
AD7415 are set to 1001. T he AD7415 comes in four ver-
sions, the AD7415-0, AD7415-1, AD7415-2 and the
AD7415-3. T he first two versions have three different I2C
addresses available which are selected by either tying the
AS pin to GND, to VDD or letting the pin float (see
T able 1). By giving different addresses for the four ver-
Wr iting to the Addr ess P ointer Register for a subsequent
r ea d .
In order to read data from a particular register, the Ad-
dress 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-
REV. PrB
–7–
Preliminary Technical Data
AD7415
byte write operation, as shown in Figure 5. T he 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.
of reads can be subsequently done from that register with-
out having to write to the Address Pointer Register again.
If you want to read from another register then you will
have to write to the Address Pointer Register again to set
up the relevent register address.
Wr iting a single byte of data to the Configur ation Regis-
t e r
Reading data from the T emperature Value Register is a
two byte operation as shown in Figure 8. T he same rules
apply for a two byte read as a single byte read.
T he Configuration register is an 8-bit register so only one
byte of data can be written to it. Writing a single byte of
data to the register consists of the serial bus address, the
data register address written to the Address Pointer Regis-
ter, followed by the data byte written to the selected data
register. T his is illustrated in Figure 6.
P O WE R - O N D E F AU LT S
T he AD7415 always powers up with the following de-
faults........
Address Pointer Register pointing to the T emperature
Value Register.
RE AD ING D ATA FRO M TH E AD 7415
Configuration Register loaded with 40 H ex.
Reading data from the AD7415 is a one or two byte op-
eration. Reading back the contents of the Configuration
Register is a single byte read operation as shown in Figure
7. T he register address previously having been set up by a
single byte write operation to the Address Pointer Regis-
ter. Once the register address has been set up, any number
O P E R AT ING M O D E S
Mode 1
T his is the power-on default mode of the AD7415. In this
mode the AD7415 does a temperature conversion every
1
9
1
9
SCL
SDA
1
0
0
1
A2
A1
A0
R/W
P6
P5
P3
P2
P1
P7
P4
P0
START BY
MASTER
ACK. BY
AD7415
ACK. BY
AD7415
STOP BY
MASTER
FRAME 1
FRAME 2
SERIAL BUS ADDRESS BYTE
ADDRESS POINTER REGISTER BYTE
Figure 5. Writing to the Address Pointer Register to select
a register for a subsequent Read operation
1
1
9
1
9
SCL
SDA
R/W
0
0
A2
A1
A0
P7
P6
P5
P3
P1
P0
1
P4
P2
START BY
MASTER
ACK. BY
AD7415
ACK. BY
AD7415
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
1
9
SCL (CONTINUED)
SDA (CONTINUED)
D 6
D5
D3
D1
D7
D4
D2
D0
ACK. BY
AD7415
STOP BY
MASTER
FRAME 3
DATA BYTE
Figure 6. Writing to the Address Pointer Register followed
by a single byte of data to the Configuration Register
–8–
REV. PrB
Preliminary Technical Data
400 µs and then partially powers down until the next con-
version occurs.
AD7415
T he 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 set to a 1.
If a read occurs during a conversion, the conversion aborts
and a new one starts after the read operation has finished.
T he temperature value that is read is that of the previous
completed conversion. T he next conversion will typically
occur 400 µs after the new conversion has begun.
When a temperature measurement is required, a write
operation can be performed to power-up the part. T he
part then performs a conversion and is returned to full
power-down. T he temperature value can be read in the
full power-down mode as the serial interface is still pow-
ered up.
If a read is performed between conversions, a conversion is
initiated right after the read operation. After this conver-
sion, the part returns to performing a conversion every 400
µs.
Mode 2
T he only other mode the AD7415 operates in is the full
power-down mode. T his mode is usually used when tem-
perature measurements are required at a very slow rate.
1
9
1
9
SCL
SDA
1
0
0
1
A2
A1
A0
R/W
D7
D6
D5
D4
D3
D2
D1
D0
START BY
MASTER
ACK. BY
AD7415
NO ACK. BY
MASTER
STOP BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
SINGLE DATA BYTE FROM AD7415
Figure 7. Reading a single byte of data from the Configura-
tion register
9
1
1
9
1
SCL
R/W
SDA
0
0
1
A2
A1
A0
D15
D14
D13
D12
D10
D11
D9
D8
START BY
MASTER
ACK. BY
AD7415
ACK. BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
MOST SIGNIFICANT DATA BYTE FROM AD7415
1
9
SCL (CONTINUED)
SDA (CONTINUED)
D 6
D5
D3
D1
D7
D4
D2
D0
NO ACK. BY STOP BY
MASTER MASTER
FRAME 3
LEAST SIGNIFICANT DATA BYTE FROM AD7415
Figure 8. Reading two bytes of data from the Tem pera-
ture Value Register
REV. PrB
–9–
Preliminary Technical Data
AD7415
O U T LINE D IM E NS IO NS
Dimensions shown in inches and (mm).
5- LE AD P LAST IC SURF AC E MO UNT SO T - 23
(R T - 5)
0.122 (3.10)
0.106 (2.70)
5
1
4
3
0.071 (1.80)
0.059 (1.50)
0.118 (3.00)
0.098 (2.50)
2
P IN
1
0.037 (0.95) BSC
0.075 (1.90)
BSC
0.051 (1.30)
0.035 (0.90)
0.057 (1.45)
0.035 (0.90)
10؇
0؇
0.020 (0.50)
0.010 (0.25)
0.022 (0.55)
0.014 (0.35)
0.059 (0.15)
0.000 (0.00)
SEAT ING
P L AN E
0.009 (0.23)
0.003 (0.08)
–10–
REV. PrB
ADDENDUM
ThisAD7415RevPrBpreliminarydatasheetisspecifictoRevAsamplesilicon.TheRevBsamplesiliconwilldifferfrom
RevAinthefollowingway:-
1. Oneshot Mode. When a 1 is written to the D2 bit of the Configuration register, a single temperature conversion is
performed. A temperature conversion will not be initiated after each read or write.
2. Rate of T emperature Conversions. Rev A sample silicon does a temperature conversion every 400
sample silicon will have a temperature conversion every 800 s.
µs while Rev B
m
相关型号：
SI9130DB
5- and 3.3-V Step-Down Synchronous ConvertersWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9135LG-T1
SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9135LG-T1-E3
SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9135_11
SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9136_11
Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9130CG-T1-E3
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9130LG-T1-E3
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9130_11
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9137
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9137DB
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9137LG
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9122E
500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification DriversWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
©2020 ICPDF网 联系我们和版权申明