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參數(shù)資料
| 型號(hào)： | AD7746 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 24BIT(s), 2Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | MO-153AB, TSSOP-16 |
| 文件頁數(shù)： | 3/17頁 |
| 文件大?。?/td> | 232K |
| 代理商： | AD7746 |
Preliminary Technical Data
AD7745/AD7746
Rev. PrF | Page 11 of 17
STATUS REGISTER
Address pointer 0x00, read only, default value 0x07
Indicates status of the converter. Status register can be read via
the 2-wire serial interface to query a finished conversion.
The RDY pin reflects status of the RDY bit. Therefore, the RDY
pin high to low transition can be used as an alternative indica-
tion of the finished conversion.
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Mnemonic
-
EXCERR
RDY
RDYVT
RDYCAP
Default
0
1
Bit
Mnemonic
Description
7-4
-
Not used, always read 0
3
EXCERR
EXCERR = 1 indicates that the excitation output cannot be driven properly.
The possible reason can be short or too high capacitance between the excitation pin and ground.
2
RDY
RDY = 0 indicates that conversion on the enabled channel(s) has been finished and new unread data are avail-
able.
If both capacitive and voltage / temperature channels are enabled, thy RDY bit will be changed to 0 after con-
version on both channels is finished. The RDY bit will return to 1 either when data are read or prior finishing
the next conversion.
If only one channel is enabled, for example capacitive, then the RDY bit will reflect the RDYCAP bit.
1
RDYVT
RDYVT = 0 indicates that a conversion on the voltage / temperature channel has been finished and new un-
read data are available.
0
RDYCAP
RDYCAP = 0 indicates that a conversion on the capacitive channel has been finished and new unread data are
available.
CAP DATA REGISTER
24 bits, address pointer 0x01, 0x02, 0x03, read only,
default value 0x000000
Capacitive channel output data. The register is updated after
finished conversion on the capacitive channel, with one excep-
tion: When the serial interface read operation from the CAP
DATA register is in progress, the data register is not updated
and the new capacitance conversion result is lost.
Stop condition on the serial interface is considered as the end of
the read operation. Therefore, to prevent data corruption, all 3
bytes of the data register should be read subsequently using the
register address pointer auto-increment feature of the serial
interface.
To prevent losing some of the results, the CAP DATA register
should be read before the next conversion on the capacitive
channel is finished.
Code 0x000000 represents negative full-scale (-4.096 pF),
code 0x800000 represents zero scale (0 pF) and the code
0xFFFFFF represents positive full scale (+4.096 pF).
VT DATA REGISTER
24 bits, address pointer 0x04, 0x05, 0x06, read only,
default value 0x000000
Voltage / Temperature channel output data. The register is up-
dated after finished conversion on the voltage channel or
temperature channel, with one exception: When the serial inter-
face read operation from the VT DATA register is in progress,
the data register is not updated and the new voltage / tempera-
ture conversion result is lost.
Stop condition on the serial interface is considered as the end of
the read operation. Therefore, to prevent data corruption, all 3
bytes of the data register should be read subsequently using the
register address pointer auto-increment feature of the serial
interface.
For voltage input, code 0 represents negative full scale (-VREF),
code 0x800000 represents zero scale (0 V) and the code
0xFFFFFF represents positive full scale (+VREF).
To prevent losing some of the results, the VT DATA register
should be read before the next conversion on the voltage /tem-
perature channel is finished.
For temperature sensor, the temperature can be calculated from
code using equation:
Temperature (°C) = (Code / 2048) - 4096
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| AD7746ARUZ-REEL | 功能描述:IC CONV 2CH CAP TO DGTL 16-TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 類型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
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