LTC1292 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1292' PDF : 24 Pages View PDF
LTC1292/LTC1297
APPLICATI S I FOR ATIO
ANALOG
INPUTS
LTC1292
LTC1297 CS
CLK
DOUT
8051
P1.4
P1.3
P1.1
DOUT FROM LTC1292/LTC1297 STORED IN 8051 RAM
MSB
R2 B11 B10 B9 B8 B7 B6 B5 B4
R3 B3 B2 B1 B0 O O O O
CS
CLK
DOUT
B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
Figure 5. Hardware and Software Interface to Intel 8051 Processor
LTC1292/7 F05
8051 CODE
LABEL MNEMONIC
MOV
CLR
SETB
CONT CLR
NOP
NOP
NOP
NOP
SETB
CLR
SETB
CLR
MOV
LOOP MOV
RLC
SETB
CLR
DJNZ
MOV
MOV
OPERAND
P1,#02h
P1.3
P1.4
P1.4
P1.3
P1.3
P1.3
P1.3
R4,#08H
C,P1.1
A
P1.3
P1.3
R4,LOOP
R2,A
C,P1.1
COMMENTS
BIT 1 PORT 1 SET AS INPUT
CLK GOES LOW
CS GOES HIGH
CS GOES LO
4 NOP FOR LTC1297 tsuCS (Wakeup
Time) (Not Needed for LTC1292)
CLK GOES HIGH
CLK GOES LOW
CLK GOES HIGH
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
LABEL MNEMONIC
CLR
RLC
CLR
MOV
RLC
SETB
CLR
MOV
RLC
SETB
CLR
MOV
SETB
RRC
RRC
RRC
RRC
MOV
AJMP
OPERAND
A
A
SETB
P1.3
C,P1.1
A
P1.3
P1.3
C,P1.1
A
P1.3
P1.3
C,P1.1
P1.4
A
A
A
A
R3,A
CONT
COMMENTS
CLEAR ACC
ROTATE DATA BIT (B3) INTO ACC
P1.3
CLK GOES HIGH
CLK GOES LOW
READ DATA BIT INTO CARRY
ROTATE DATA BIT (B2) INTO ACC
CLK GOES HIGH
CLK GOES LOW
READ DATA BIT INTO CARRY
ROTATE DATA BIT (B1) INTO ACC
CLK GOES HIGH
CLK GOES LOW
READ DATA BIT INTO CARRY
CS GOES HIGH
ROTATE DATA BIT (B0) INTO ACC
ROTATE RIGHT INTO ACC
ROTATE RIGHT INTO ACC
ROTATE RIGHT INTO ACC
STORE LSBs IN R3
START NEXT CONVERSION
Sharing the Serial Interface
The LTC1292/LTC1297 can share the same two-wire
serial interface with other peripheral components or other
LTC1292/LTC1297s (Figure 6). In this case, the CS signals
decide which LTC1292 is being addressed by the MPU.
ANALOG CONSIDERATIONS
Grounding
The LTC1292/LTC1297 should be used with an analog
ground plane and single point grounding techniques. Do
not use wire wrapping techniques to breadboard and
evaluate the device. To achieve the optimum performance
12
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