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| 型號： | EVAL-AD7746EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 7/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR AD7746 |
| 標準包裝： | 1 |
| 傳感器類型： | 觸摸，電容式 |
| 接口： | I²C |
| 電源電壓： | 2.7 V ~ 5.25 V |
| 嵌入式： | 否 |
| 已供物品： | 板，纜線，CD |
| 已用 IC / 零件： | AD7746 |
| 產(chǎn)品目錄頁面： | 781 (CN2011-ZH PDF) |
| 相關產(chǎn)品： | AD7746ARUZ-ND - IC CONV 2CH CAP TO DGTL 16-TSSOP AD7746ARUZ-REEL7-ND - IC CONV 2CH CAP TO DGTL 16-TSSOP AD7746ARUZ-REEL-ND - IC CONV 2CH CAP TO DGTL 16-TSSOP |
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AD7745/AD7746
Rev. 0| Page 15 of 28
STATUS REGISTER
Address Pointer 0x00, Read Only, Default Value 0x07
This register indicates the status of the converter. The status
register can be read via the 2-wire serial interface to query a
finished conversion.
The RDY pin reflects the status of the RDY bit. Therefore, the
RDY pin high-to-low transition can be used as an alternative
indication of the finished conversion.
Table 9. Status Register Bit Map
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
Table 10.
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 a short circuit 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 is
available.
If both capacitive and voltage/temperature channels are enabled, the RDY bit is changed to 0 after conversion
on both channels is finished. The RDY bit returns to 1 either when data is read or prior to finishing the next
conversion.
If, for example, only the capacitive channel is enabled, then the RDY bit reflects the RDYCAP bit.
1
RDYVT
RDYVT = 0 indicates that a conversion on the voltage/temperature channel has been finished and new unread
data is available.
0
RDYCAP
RDYCAP = 0 indicates that a conversion on the capacitive channel has been finished and new unread data is
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
exception: 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.
The stop condition on the serial interface is considered to be the
end of the read operation. Therefore, to prevent data corruption,
all three bytes of the data register should be read sequentially
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.
The 0x000000 code represents negative full scale (–4.096 pF),
the 0x800000 code represents zero scale (0 pF), and the
0xFFFFFF code 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
updated after finished conversion on the voltage channel or
temperature channel, with one exception: When the serial
interface read operation from the VT DATA register is in
progress, the data register is not updated and the new
voltage/temperature conversion result is lost.
The stop condition on the serial interface is considered to be the
end of the read operation. Therefore, to prevent data corruption,
all three bytes of the data register should be read sequentially
using the register address pointer auto-increment feature of the
serial interface.
For voltage input, Code 0 represents negative full scale (–VREF),
the 0x800000 code represents zero scale (0 V), and the
0xFFFFFF code 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/
temperature channel is finished.
For the temperature sensor, the temperature can be calculated
from code using the following equation:
Temperature (°C) = (Code/2048) 4096
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