LTC1392IS8 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1392IS8' PDF : 12 Pages View PDF
APPLICATIONS INFORMATION
MSB-First Data (MSBF = 1)
CS
CLK
DIN
DOUT
tsuCS
tWAKEUP
SEL1 SEL0
START
Hi-Z
MSBF
tSMPL
tCYC
B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
tCONV
LTC1392
Hi-Z
FILLED WITH ZEROS
CS
CLK
DIN
DOUT
tsuCS
tWAKEUP
SEL1 SEL0
START
Hi-Z
MSBF
tSMPL
tCYC
B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 B1 B2 B3 B4 B5 B6 B7 B8 B9
tCONV
Figure 1
FILLED WITH ZEROS
Hi-Z
LTC1392 • F01
temperature measurement or a 10µs delay for other mea-
surements, followed by a 4-bit input word which config-
ures the LTC1392 for the current conversion. This data
word is shifted into the DIN input. DIN is then disabled from
shifting in any data and the DOUT pin is configured from
three-state to an output pin. A null bit and the result of the
current conversion are serially transmitted on the falling
CLK edge onto the DOUT line. The format of the A/D result
can be either MSB-first sequence or MSB-first sequence
followed by an LSB-first sequence. This provides easy
interface to MSB- or LSB-first serial ports. Bringing CS
high resets the LTC1392 for the next data exchange.
INPUT DATA WORD
Data transfer is initiated by a falling chip select (CS) signal.
After CS falls, the LTC1392 looks for a start bit. Once the
start bit is received, the next three bits are shifted into the
DIN input which configures the LTC1392 and starts the
conversion. Further inputs on the DIN input are then
ignored until the next CS cycle. The four bits of the input
word are defined as follows:
BIT 3
Start
BIT 2
Select 1
BIT 1
Select 0
BIT 0
MSBF
Start Bit
The first “logic one” clocked into the DIN input after CS
goes low is the Start Bit. The Start Bit initiates the data
transfer and all leading zeros which precede this logical
one will be ignored. After the Start Bit is received the
remaining bits of the input word will be clocked in. Further
input on the DIN pin are then ignored until the next CS
cycle.
7
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