參數(shù)資料
型號(hào)： LTC1290CISW#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 21/32頁(yè)
文件大?。?/td> 0K
描述： IC DATA ACQ SYS 12BIT 20-SOIC
標(biāo)準(zhǔn)包裝： 1,000
類(lèi)型： 數(shù)據(jù)采集系統(tǒng)（DAS），ADC
分辨率（位）： 12 b
采樣率（每秒）： 50k
數(shù)據(jù)接口： 串行，并聯(lián)
電壓電源： 雙 ±
電源電壓： ±5 V，5 V
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 20-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 20-SOIC
包裝： 帶卷 (TR)
28
LTC1290
1290fe
U
S
A
O
PPLICATI
TYPICAL
SNEAK-A-BIT Code for the LTC1290 Using the MC68HC05C4
MNEMONIC
DESCRIPTION
READ –/+:
LDA
#$3F
Load DIN Word for LTC1290 into ACC
JSR
TRANSFER
Read LTC1290 Routine
LDA
$60
Load MSBs from LTC1290 into ACC
STA
$71
Store MSBs in $71
LDA
$61
Load LSBs from LTC1290 into ACC
STA
$72
Store LSBs in $72
RTS
Return
READ +/–:
LDA
#$7F
Load DIN Word for LTC1290 into ACC
JSR
TRANSFER
Read LTC1290 Routine
LDA
$60
Load MSBs from LTC1290 into ACC
STA
$73
Store MSBs in $73
LDA
$61
Load LSBs from LTC1290 into ACC
STA
$74
Store LSBs in $74
RTS
Return
TRANSFER: BCLR 0,$02
CS Goes Low
STA
$0C
Load DIN into SPI, Start Transfer
LOOP 1:
TST
$0B
Test Status of SPIF
BPL
LOOP 1
Loop to Previous Instruction if Not Done
LDA
$0C
Load Contents of SPI Data Reg. into ACC
STA
$0C
Start Next Cycle
STA
$60
Store MSBs in $60
LOOP 2:
TST
$0B
Test Status of SPIF
BPL
LOOP 2
Loop to Previous Instruction if Not Done
BSET 0,$02
CS Goes High
LDA
$0C
Load Contents of SPI Data Reg. into ACC
STA
$61
Store LSBs in $61
RTS
Return
CHK SIGN: LDA
$73
Load MSBs of
± Read into ACC
ORA $74
Or ACC (MSBs) with LSBs of
± Read
BEQ
MINUS
If Result is 0 Go to Minus
CLC
Clear Carry
ROR $73
Rotate Right $73 Through Carry
ROR $74
Rotate Right $74 Through Carry
LDA
$73
Load MSBs of
± Read into ACC
STA
$77
Store MSBs in RAM Location $77
LDA
$74
Load LSBs of
± Read into ACC
STA
$87
Store LSBs in RAM Location $87
BRA END
Go to End of Routine
MINUS:
CLC
Clear Carry
ROR $71
Shift MSBs of
± Read Right
ROR $72
Shift LSBs of
± Read Right
COM $71
1’s Complement of MSBs
COM $72
1’s Complement of LSBs
LDA
$72
Load LSBs into ACC
ADD #$01
Add 1 to LSBs
STA
$72
Store ACC in $72
CLRA
Clear ACC
ADC $71
Add with Carry to MSBs. Result in ACC
STA
$71
Store ACC in $71
STA
$77
Store MSBs in RAM Location $77
LDA
$72
Load LSBs in ACC
STA
$87
Store LSBs in RAM Location $87
END:
RTS
Return
SNEAK-A-BIT Code
DOUT from LTC1290 in MC68HC05C4 RAM
DIN Words for LTC1290
Sign
LSB
MUX Addr.
UNI
MSBF
Word
Length
DIN1
0
11
DIN2
0
1
11
DIN3
0
11
(ODD/SIGN)
1290 TA06
LOCATION $77
B12
B11
B10
B9
B8
B7
B6
B5
LOCATION $87
B4
B3
B2
B1
B0
Filled with 0s
SNEAK-A-BIT Code for the LTC1290 Using the MC68HC05C4
MNEMONIC
DESCRIPTION
LDA
#$50
Configuration Data for SPCR
STA
$0A
Load Configuration Data into $0A
LDA
#$FF
Configuration Data for Port C DDR
STA
$06
Load Configuration Data into Port C DDR
BSET
0,$02
Make Sure CS is High
JSR
READ –/+
Dummy Read Configures LTC1290
for next read
JSR
READ –/+
Read CH6 with Respect to CH7
JSR
READ –/+
Read CH7 with Respect to CH6
JSR
CHK Sign
Determines which Reading has Valid Data,
Converts to 2’s Complement and
Stores in RAM
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