lt1293 Linear Technology Corporation, lt1293 Datasheet - Page 14

• Manufacturer Part Number: lt1293
• Description: Single Chip 12-bit Data Acquisition System
• Manufacturer: Linear Technology Corporation

LTC1293/LTC1294/LTC1296
A
14
all logical ones will be shifted out followed by logical
zeroes till CS goes high. Then the D
high impedance state. The LTC 1293/4/6 will remain in the
shutdown mode till the next CS cycle. There is no warm-
up or wait period required after coming out of the power
shutdown cycle so a conversion can commence after CS
goes low (see Power Shutdown Operating Sequence). The
LTC1296 has a System Shutdown Output pin (SSO) which
will go low when power shutdown is activated. The pin will
stay low till next CS cycle.
Microprocessor Interfaces
The LTC1293/4/6 can interface directly (without external
hardware) to most popular microprocessors (MPU) syn-
chronous serial formats (see Table 1). If an MPU without
a dedicated serial port is used, then three of the MPU’s
parallel port lines can be programmed to form the serial
link to the LTC1293/4/6. Included here are one serial
interface example and one example showing a parallel
port programmed to form the serial interface.
Microprocessor Interfaces
The LTC1293/4/6 can interface directly (without external
hardware) to most popular microprocessors (MPU) syn-
chronous serial formats (see Table 1). If an MPU without
a dedicated serial port is used, then three of the MPU’s
parallel port lines can be programmed to form the serial
link to the LTC1293/4/6.
D
CLK
OUT
D
PPLICATI
CS
IN
*STOPPING THE CLOCK WILL HELP REDUCE POWER CONSUMPTION.
CS CAN BE BROUGHT HIGH ONCE THE DIN WORD HAS BEEN CLOCKED IN.
START
SEL1/
DIFF
O
ODD/
SIGN
U
SEL1
S
SEL0
HI-Z
UNI
I FOR ATIO
Example: Differential Inputs (CH4
U
MSBF
PS
OUT
REQUEST POWER SHUTDOWN
B11
W
line will go into its
•
•
Power Shutdown Operating Sequence
•
U
•
•
•
DON'T CARE
+
•
, CH5
•
Table 1. Microprocessor with Hardware Serial Interfaces Compat-
ible with the LTC1293/4/6**
* Requires external hardware
** Contact factory for interface information for processors not on this list
†
–
•
Motorola
RCA
Hitachi
National Semiconductor
Texas Instruments
), Unipolar Mode and MSB-First Data
MICROWIRE and MICROWIRE/PLUS are trademarks of National
Semiconductor Corp.
•
B0
PART NUMBER
MC6805S2, S3
MC68HC11
MC68HC05
CDP68HC05
HD6305
HD6301
HD63701
HD6303
HD64180
COP400 Family
COP800 Family
NS8050U
HPC16000 Family
TMS7002
TMS7042
TMS70C02
TMS70C42
TMS32011*
TMS32020*
TMS370C050
ZEROES
FILLED
WITH
SHUTDOWN*
HI-Z
START
NEW CONVERSION BEGINS
SEL1/
DIFF
TYPE OF INTERFACE
SPI
SPI
SPI
SPI
SCI Synchronous
SCI Synchronous
SCI Synchronous
SCI Synchronous
SCI Synchronous
MICROWIRE
MCROWIRE/PLUS
MICROWIRE/PLUS
MICROWIRE/PLUS
Serial Port
Serial Port
Serial Port
Serial Port
Serial Port
Serial Port
SPI
ODD/
SIGN
SEL1
SEL0
UNI
†
MSBF
†
PS
LTC1293 AI06
129346fs