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參數(shù)資料
| 型號： | XTR108EA |
| 英文描述： | 4-20mA, TWO-WIRE TRANSMITTER Smart Programmable with Signal Conditioning |
| 中文描述： | 的4 - 20mA，兩線制變送器可編程智能與信號調(diào)理 |
| 文件頁數(shù)： | 17/27頁 |
| 文件大?。?/td> | 497K |
| 代理商： | XTR108EA |
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XTR108
SBOS187B
17
www.ti.com
FIGURE 7. Writing to and Reading From the EEPROM Device From External Controller. (See Table XIV for timing key.)
Instruction to XTR108
Data to/from EEPROM
CS2
SCLK
t
14
DIO
0
1
1
1
1
1
1
1
CS1
SPEC
DESCRIPTION
MIN
TYP
MAX
UNITS
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
t
9
t
10
t
11
t
12
t
13
t
14
CS1 LOW to SCLK Rising Setup Time
SCLK Pulse Width HIGH and LOW
DIO to SCLK Rising Setup Time
DIO to SCLK Rising Hold Time
CS1 to Last SCLK Rising Hold Time
SCLK Falling to DIO Driven Valid by XTR108
CS1 to DIO Tri-State
SCLK Pulse Width During EEPROM Readback
CS2 HIGH Between Successive EEPROM Readbacks
SCLK Driven LOW Before CS1 LOW When Interrupting XTR108 Readback from EEPROM
CS1 LOW to SCLK Rising Setup Time When Interrupting XTR108 EEPROM Readback
CS1 Falling to CS2 HIGH
CS1 Falling to DIO Tri-State
CS1 Rising to CS2 HIGH
XTR108 EEPROM Update Rate in Continuous Readback Mode
2.0
100
20
20
20
0
0
ns
ns
ns
ns
ns
ns
ns
us
us
ns
us
ns
ns
ns
kHz
50
20
5
10
20
40
0
0
0
50
20
20
0.9
TABLE XIV. Timing Diagram Key.
To be compatible with SPI EEPROM devices, the XTR108
latches input data on the rising edge of SCLK. Output data
transitions on the falling edge of SCLK. All serial interface
transactions must be framed by CS1. CS1 must be asserted
to start an operation, and it must be de-asserted to terminate
an operation.
EEPROM DATA STORAGE
The XTR108 automatically reads data from an SPI-compat-
ible EEPROM device. The models 25C040 from MicroChip
and the AT25010 from Atmel have been tested and are
known to work. Equivalent devices with an SPI interface can
be expected to work. The XTR108 will read data from
addresses 4 through 15 of the EEPROM. The address in the
EEPROM is the same as the address for the corresponding
data in the XTR108. The XTR108 will not write data to the
EEPROM. The external calibration controller is responsible
for writing data to the EEPROM.
CHECKSUM FUNCTION
To validate the data from the EEPROM device, the XTR108
calculates a checksum on the incoming serial-data stream
during each write operation. The value written to the EEPROM
that will be transferred to register 15 during an EEPROM read
operation must be such that the sum of the data in registers 4
through 15 totals 0xFF (255). The sum is calculated by
performing an add/accumulate function on all of the data
bytes of a read operation. An end-around carry is used during
the add/accumulate operation. If a carry-out was generated in
the previous add operation, it is used as a carry-in for the next
add operation for the checksum operation. The following code
shows how the value of register 15 could be calculated:
Sum = 0
FOR Index = 4 TO 14
Sum = Sum + Data [Index]
IF Sum > 255 THEN
Sum = Sum – 255
NEXT Index
Data [15] = 255 – Sum
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XTR108EA/2K5 | 功能描述:接口 - 專用 4-20mA 2Wire Trsmtr ’Smart’ Prog RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:BGA-59 |
| XTR108EA/2K5G4 | 功能描述:接口 - 專用 4-20mA 2Wire Trsmtr ’Smart’ Prog RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:BGA-59 |
| XTR108EA-2K5 | 制造商:BB 制造商全稱:BB 功能描述:4-20mA, TWO-WIRE TRANSMITTER a??Smarta?? Programmable with Signal Conditioning |
| XTR108EA-2K5G4 | 制造商:BB 制造商全稱:BB 功能描述:4-20mA, TWO-WIRE TRANSMITTER a??Smarta?? Programmable with Signal Conditioning |
| XTR108EAG4 | 功能描述:接口 - 專用 4-20mA 2Wire Trsmtr ’Smart’ Prog RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:BGA-59 |
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