參數(shù)資料
型號： LTC1197LCMS8
廠商： LINEAR TECHNOLOGY CORP
元件分類： ADC
英文描述： 10-Bit, 500ksps ADCs in MSOP with Auto Shutdown
中文描述： 1-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO8
封裝： PLASTIC, MSOP-8
文件頁數(shù)： 23/28頁
文件大?。?/td> 446K
代理商： LTC1197LCMS8
23
LTC1197/LTC1197L
LTC1199/LTC1199L
U
S
A
O
PPLICATI
TYPICAL
Interfacing to the Parallel Port of the
Intel 8051 Family
The Intel 8051 has been chosen to demonstrate the
interface between the LTC1199 and parallel port micro-
processors. Normally the CS, CLK and D
IN
signals would
be generated on three port lines and the D
OUT
signal read
on a fourth port line. This works very well. However, we
will demonstrate here an interface with the D
IN
and D
OUT
of the LTC1199 tied together as described in the
SERIAL INTERFACE section. This saves one wire.
The 8051 first sends the start bit and MUX address to the
LTC1199 over the data line connected to P1.2. Then P1.2
is reconfigured as an input (by writing to it a one) and
the 8051 reads back the 8-bit A/D result over the same
data line.
LABEL
MNEMONIC
MOV
SETB
CLR
MOV
RLC
CLR
MOV
SETB
DJNZ
MOV
CLR
MOV
MOV
RLC
SETB
CLR
DJNZ
MOV
MOV
SETB
CLR
CLR
RLC
OPERAND
A, #FFH
P1.4
P1.4
R4, #04
A
P1.3
P1.2, C
P1.3
R4, LOOP 1
P1, #04
P1.3
R4, #0AH
C, P1.2
A
P1.3
P1.3
R4, LOOP
R2, A
C, P1.2
P1.3
P1.3
A
A
COMMENTS
D
IN
word for LTC1199
Make sure CS is high
CS goes low
Load counter
Rotate D
IN
bit into Carry
CLK goes low
Output D
IN
bit into Carry
CLK goes high
Next bit
Bit 2 becomes an input
CLK goes low
Load counter
Read data bit into Carry
Rotate data bit into ACC
CLK goes high
CLK goes low
Next bit
Store MSBs in R2
Read data bit into Carry
CLK goes high
CLK goes low
Clear ACC
Rotate data bit from Carry to
ACC
Read data bit into Carry
Rotate right into ACC
Rotate right into ACC
Store LSBs in R3
CS goes high
LOOP 1
LOOP
MOV
RRC
RRC
MOV
SETB
C, P1.2
A
A
R3, A
P1.4
CS
CLK
D
OUT
D
IN
LTC1199
ANALOG
INPUTS
P1.4
P1.3
P1.2
8051
MUX ADDRESS
A/D RESULT
1197/99 TA06
D
OUT
from LTC1199 Stored in 8051 RAM
1
CS
CLK
DATA (D
IN
/D
OUT
)
START
ODD/
SIGN
DUMMY
B9
LTC1199 SENDS A/D RESULT
BACK TO 8051 P1.2
8051 P1.2 OUTPUTS DATA
TO LTC1199
8051 P1.2 RECONFIGURED
AS AN INPUT AFTER THE 4TH RISING
CLK AND BEFORE THE 4TH FALLING CLK
LTC1199 TAKES CONTROL OF DATA LINE
ON 4TH FALLING CLK
2
3
4
SGL/
DIFF
B8
B7
B6
B5
B4
B3
B2
B1
B0
1197/99 TA08
R2
1197/99 TA07
MSB
B9
B8
B7
B6
B5
B4
B3
B2
R3
LSB
B1
B0
0
0
0
0
0
0
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