Datasheet
LTC2444/LTC2445/
LTC2448/LTC2449
19
2444589fc
For more information www.linear.com/LTC2444
External Serial Clock, 2-Wire I/O
This timing mode utilizes a 2-wire serial I/O interface.
The conversion result is shifted out of the device by an
externally generated serial clock (SCK) signal, see Figure
7. CS may be permanently tied to ground, simplifying the
user interface or isolation barrier. The external serial clock
mode is selected by tying EXT LOW.
Since CS is tied LOW, the end-of-conversion (EOC) can be
continuously monitored at the SDO pin during the convert
and sleep states. Conversely, BUSY (Pin 2) may be used
to monitor the status of the conversion cycle. EOC or
BUSY may be used as an interrupt to an external control
-
applicaTions inForMaTion
ler
indicating the conversion result is ready.
EOC
= 1
(BUSY = 1) while the conversion is in progress and
EOC
=0 (BUSY = 0) once the conversion enters the low
power sleep state. On the falling edge of
EOC
/BUSY, the
conversion result is loaded into an internal static shift
register. The device remains in the sleep state until the
first rising edge of SCK. Data is shifted out the SDO pin
on each falling edge of SCK enabling external circuitry to
latch data on the rising edge of SCK.
EOC
can be latched
on the first rising edge of SCK. On the 32nd falling edge
of SCK, SDO and BUSY go HIGH (
EOC
=1) indicating a
new conversion has begun.
Figure 7. External Serial Clock, CS = 0 Operation (2-Wire)
CS
SCK
(EXTERNAL)
SDI
SDO
BUSY
2444589 F07
CONVERSION
SLEEP
DATA OUTPUT
CONVERSION
MSB
BIT 28 BIT 27 BIT 26 BIT 25 BIT 24 BIT 23 BIT 22 BIT 21 BIT 20 BIT 19 BIT 0
LSB
SIG
BIT 29
“0”
BIT 30
EOC
BIT 31
1 0 EN SGL A2 A1 A0 OSR3 OSR2 OSR1 OSR0 TWOXODD
1 2 3 4 5 6 7 8 9 10 11 12 13 14 32
DON'T CAREDON'T CARE
V
CC
F
O
REF
+
REF
–
CH0
CH7
CH8
CH15
COM
SCK
SDI
SDO
CS
GND
28 35
29
30
8
15
16
23
7
38
37
1,4,5,6,31,32,33,39
36
34
REFERENCE
VOLTAGE
0.1V TO V
CC
ANALOG
INPUTS
2
= EXTERNAL OSCILLATOR
= INTERNAL OSCILLATOR
1µF
4.5V TO 5.5V
LTC2448
4-WIRE
SPI INTERFACE
•
•
•
•
•
•
•
•
•
•
•
•
BUSY