參數(shù)資料
型號: LTC1090CN
廠商: Linear Technology
文件頁數(shù): 9/28頁
文件大?。?/td> 0K
描述: IC DATA ACQUIS SYS 10BIT 20-DIP
標準包裝: 18
類型: 數(shù)據(jù)采集系統(tǒng)(DAS),ADC
分辨率(位): 10 b
采樣率(每秒): 30k
數(shù)據(jù)接口: 串行
電壓電源: 單/雙電源
電源電壓: ±5V,5V,10V
工作溫度: -40°C ~ 85°C
安裝類型: 通孔
封裝/外殼: 20-DIP(0.300",7.62mm)
供應(yīng)商設(shè)備封裝: 20-PDIP
包裝: 管件
17
LTC1090
1090fc
Parallel Port Microprocessors
When interfacing the LTC1090 to an MPU which has a
parallel port, the serial signals are created on the port with
software. Three MPU port lines are programmed to create
the CS, SCLK and DIN signals for the LTC1090. A fourth
port line reads the DOUT line. An example is made of the
Intel 8051/8052/80C252 family.
Intel 8051
To interface to the 8051, the LTC1090 is programmed for
MSB first format and 10-bit word length. The 8051 gener-
ates CS, SCLK and DIN on three port lines and reads DOUT
on the fourth.
Hardware and Software Interface to Intel 8051 Processor
8051 Code
MNEMONIC
DESCRIPTION
MOV PI,#02H
Initialize port 1 (bit 1 is made
an input)
CLR P1.3
SCLK goes low
SETB P1.4
CS goes high
CONTINUE: MOV A,#0DH
DIN word for the LTC1090 is
placed in ACC.
CLR P1.4
CS goes low
MOV R4,#08
Load counter
NOP
Delay for deglitcher
LOOP:
MOV C, P1.1
Read data bit into carry
RLC A
Rotate data bit into ACC
MOV P1.2, C
Output DIN bit to LTC1090
SETB P1.3
SCLK goes high
CLR P1.3
SCLK goes low
DJNZ R4, LOOP
Next bit
MOV R2, A
Store MSBs in R2
MOV C, P1.1
Read data bit into carry
CLR A
CIear ACC
RLC A
Rotate data bit into ACC
SETB P1.3
SCLK goes high
CLR P1.3
SCLK goes low
MOV C, P1.1
Read data bit into carry
RRC A
Rotate right into ACC
RRC A
Rotate right into ACC
MOV R3, A
Store LSBs in R3
SETB P1.3
SCLK goes high
CLR P1.3
SCLK goes low
SETB P1.4
CS goes high
MOV R5,#07H
Load counter
DELAY:
DJNZ R5, DELAY
Delay for LTC1090 to perform
conversion
AJMP CONTINUE
Repeat program
APPLICATIO S I FOR ATIO
WU
UU
Figure 5. Several LTC1090’s Sharing One 3-Wire Serial Interface
LTC1090
ANALOG
INPUTS
DOUT
DOUT from LTC1090 stored in 8051 RAM
DIN
SCLK
ACLK
CS
P1.1
P1.2
P1.3
ALE
P1.4
8051
B9
R2
R3
*B9 is MSB in unipolar or sign bit in bipolar
MSB*
LSB
B8 B7 B6 B5 B4 B3 B2
B1 B0
000000
LTC1090 AI14
LTC1090
3
21 0
CS
8 CHANNELS
OUTPUT PORT
SERIAL DATA
3-WIRE SERIAL
INTERFACE TO OTHER
PERIPHERALS OR LTC1090s
MPU
LTC1090
3
CS
8 CHANNELS
LTC1090
3
CS
8 CHANNELS
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