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參數(shù)資料
| 型號： | AD7711AAR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | LC2MOS Signal Conditioning ADC with RTD Current Source |
| 中文描述： | 2-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO24 |
| 封裝： | SOIC-24 |
| 文件頁數(shù)： | 25/27頁 |
| 文件大?。?/td> | 222K |
| 代理商： | AD7711AAR |
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2
AD7711A
–25–
REV. C
START
WRITE DATA FROM
ACCUMULATOR TO
SERIAL BUFFER
BRING
TFS
& A0 LOW
LOAD DATA FROM
ADDRESS TO
ACCUMULATOR
CONFIGURE &
INITIALIZE
C/
m
P
SERIAL PORT
BRING
RFS
,
TFS
& A0 HIGH
BRING
TFS
& A0 HIGH
END
3
3
REVERSE
ORDER OF
BITS
Figure 16. Flowchart for Single Write Operation to the
AD7711A
AD7711A–8051 Interface
Figure 17 shows an interface between the AD7711A and the
8XC51 microcontroller. The AD7711A is configured for its exter-
nal clocking mode while the 8XC51 is configured in its Mode 0
serial interface mode. The
DRDY
line from the AD7711A is
connected to the Port P1.2 input of the 8XC51 so the
DRDY
P1.0
P3.0
P3.1
P1.1
P1.2
P1.3
8XC51
AD7711A
SDATA
A0
RFS
TFS
MODE
DRDY
SYNC
SCLK
DV
DD
Figure 17. AD7711A to 8XC51 Interface
line is polled by the 8XC51. The
DRDY
line can be connected
to the
INT1
input of the 8XC51 if an interrupt driven system is
preferred.
Table VII shows some typical 8XC51 code used for a single 24-
bit read from the output register of the AD7711A. Table VIII
shows some typical code for a single write operation to the con-
trol register of the AD7711A. The 8XC51 outputs the LSB first
in a write operation while the AD7711A expects the MSB first
so the data to be transmitted has to be rearranged before being
written to the output serial register. Similarly, the AD7711A
outputs the MSB first during a read operation while the 8XC51
expects the LSB first. Therefore, the data which is read into the
serial buffer needs to be rearranged before the correct data word
from the AD7711A is available in the accumulator.
Table VII. 8XC51 Code for Reading from the AD7711A
MOV SCON,#00010001B;
Configure 8051 for MODE 0
Operation
Disable All Interrupts
Set P1.0, Used as
RFS
Set P1.1, Used as
TFS
Set P1.3, Used as A0
Sets Number of Bytes to Be Read in
A Read Operation
Start Address for Where Bytes Will
Be Loaded
Use P1.2 as
DRDY
MOV IE,#00010000B;
SETB 90H;
SETB 91H;
SETB 93H;
MOV R1,#003H;
MOV R0,#030H;
MOV R6,#004H;
WAIT:
NOP;
MOV A,P1;
ANL A,R6;
JZ READ;
SJMP WAIT;
READ:
CLR 90H;
CLR 98H;
POLL:
JB 98H, READ1
SJMP POLL
READ 1:
MOV A,SBUF;
RLC A;
MOV B.0,C;
RLC A; MOV B.1,C; RLC A; MOV B.2,C;
RLC A; MOV B.3,C; RLC A; MOV B.4,C;
RLC A; MOV B.5,C; RLC A; MOV B.6,C;
RLC A; MOV B.7,C;
MOV A,B;
MOV @R0,A;
INC R0;
DEC R1
MOV A,Rl
JZ END
JMP WAIT
END:
SETB 90H
FIN:
SJMP FIN
Read Port 1
Mask Out All Bits Except
DRDY
If Zero Read
Otherwise Keep Polling
Bring
RFS
Low
Clear Receive Flag
Tests Receive Interrupt Flag
Read Buffer
Rearrange Data
Reverse Order of Bits
Write Data to Memory
Increment Memory Location
Decrement Byte Counter
Jump if Zero
Fetch Next Byte
Bring
RFS
High
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| AD7711AARZ | 功能描述:IC ADC 24BIT RTD I SOURCE 24SOIC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 其它有關(guān)文件:TSA1204 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):12 采樣率（每秒）:20M 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:155mW 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應(yīng)商設(shè)備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類型:4 個單端，單極；2 個差分，單極 產(chǎn)品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
| AD7711AN | 功能描述:IC ADC 24BIT RTD I SOURCE 24-DIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉(zhuǎn)換器數(shù)目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類型:- |
| AD7711ANZ | 功能描述:IC ADC 24BIT RTD I SOURCE 24-DIP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 其它有關(guān)文件:TSA1204 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):12 采樣率（每秒）:20M 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:155mW 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應(yīng)商設(shè)備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類型:4 個單端，單極；2 個差分，單極 產(chǎn)品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
| AD7711ANZ | 制造商:Analog Devices 功能描述:IC ADC 24-BIT SIGMA DELTA |
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