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參數(shù)資料
| 型號(hào)： | AD7814ART-500RL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 10BIT(s), 3.50Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | MO-178AB, SOT-23, 6 PIN |
| 文件頁(yè)數(shù)： | 7/8頁(yè) |
| 文件大?。?/td> | 123K |
| 代理商： | AD7814ART-500RL7 |
REV. E
–7–
AD7814
AD7814*
SCLK
DOUT
DIN
CS
8051*
P3.1
P3.0
P1.2
P1.3
*ADDITIONAL PINS OMITTED FOR CLARITY
Figure 4. AD7814 to 8051 Interface
AD7814 to PIC16C6x/7x Interface
Figure 5 shows an interface circuit between the AD7814 and the
PIC16C6x/7x microcontroller. The PIC16C6x/7x synchronous
serial port (SSP) is configured as an SPI master with the clock
polarity bit set to a logic one. In this mode, the serial clock line
of the PIC16C6x/7x idles high between data transfers. Data is
transferred to and from the AD7814 in two 8-bit serial data
operations. In the example shown, port line RA1 is being used
to generate the
CS for the AD7814.
AD7814*
SCLK
DOUT
DIN
CS
PIC16C6x/7x*
SCK
SDO
SDI
RA1
*ADDITIONAL PINS OMITTED FOR CLARITY
Figure 5. AD7814 to PIC16C6x/7x Interface
AD7814 to ADSP-21xx Interface
Figure 6 shows an interface between the AD7814 and the
ADSP-21xx DSP processor. To ensure correct operation of the
interface, the SPORT control register should be set up as follows:
TFSW = RFSW = 1, Alternate Framing
INVRFS = INVTFS = 1, Active Low Framing Signal
DTYPE = 00, Right Justify Data
SLEN = 1111, 16-Bit Data Words
ISCLK = 1, Internal Serial Clock
TFSR = RFS = 1, Frame Every Word
IRFS = 0, RFS Configured As Input
ITFS = 1, TFS Configured As Output
The interface requires an inverter between the SCLK line of the
ADSP-21xx and the SCLK input of the AD7814. The ADSP-
21xx has the TFS and RFS of the SPORT tied together with
TFS set as an output and RFS set as an input. The DSP operates
in alternate framing mode and the SPORT control register is set
up as described earlier.
AD7814*
SCLK
DOUT
DIN
CS
ADSP-21xx*
SCK
DR
DT
RFS
*ADDITIONAL PINS OMITTED FOR CLARITY
TFS
Figure 6. AD7814 to ADSP-21xx Interface
MOUNTING THE AD7814
The AD7814 can be used for surface or air temperature sensing
applications. If the device is cemented to a surface with ther-
mally conductive adhesive, the die temperature will be within
about 0.1
°C of the surface temperature, thanks 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.
The ground pin provides the best thermal path to the die, so the
temperature of the die will be 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.
As with any IC, the AD7814 and its associated wiring and cir-
cuits 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
AD7814 package allows it to be mounted inside sealed metal
probes, which provide a safe environment for the device.
SUPPLY DECOUPLING
The AD7814 should be decoupled with a 0.1
F ceramic
capacitor between VDD and GND. This is particularly important
if the AD7814 is mounted remotely from the power supply.
TEMPERATURE – C
–0.4
–55
TEMPERATURE
ERROR
–0.2
0
0.2
0.4
0.6
0.8
1.0
–40
0
25
40
85
100
120
Figure 7. Typical Temperature Error
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| AD7814ART-REEL | 制造商:Analog Devices 功能描述:Temp Sensor Digital Serial (4-Wire, SPI) 6-Pin SOT-23 T/R 制造商:Analog Devices 功能描述:TEMP SENSOR DGTL SERL(SPI) 6PIN SOT-23 - Tape and Reel |
| AD7814ART-REEL7 | 功能描述:IC TEMP SNSR 10BIT DGTL SOT-23-6 RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:SilentSense™ 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)溫度:-55°C ~ 125°C，外部傳感器 精確度:±2°C 本地（最大），±3°C 遠(yuǎn)程（最大） 拓?fù)?ADC（三角積分型），比較器，寄存器庫(kù) 輸出類型:I²C?/SMBus? 輸出警報(bào):是 輸出風(fēng)扇:是 電源電壓:2.7 V ~ 5.5 V 工作溫度:-55°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MSOP 包裝:帶卷 (TR) 其它名稱:MIC284-2BMMTRMIC284-2BMMTR-ND |
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