
LTC2495
2495fd
Figure 6. Conversion Sequence
Figure 7. Consecutive Reading with the Same Input/Configuration
Table 6. Address Assignment
CA2
CA1
CA0
ADDRESS
LOW
0010100
LOW
HIGH
0010110
LOW
Float
0010101
LOW
HIGH
LOW
0100110
LOW
HIGH
0110100
LOW
HIGH
Float
0100111
LOW
Float
LOW
0010111
LOW
Float
HIGH
0100101
LOW
Float
0100100
HIGH
LOW
1010110
HIGH
LOW
HIGH
1100100
HIGH
LOW
Float
1010111
HIGH
LOW
1110100
HIGH
1110110
HIGH
Float
1110101
HIGH
Float
LOW
1100101
HIGH
Float
HIGH
1100111
HIGH
Float
1100110
Float
LOW
0110101
Float
LOW
HIGH
0110111
Float
LOW
Float
0110110
Float
HIGH
LOW
1000111
Float
HIGH
1010101
Float
HIGH
Float
1010100
Float
LOW
1000100
Float
HIGH
1000110
Float
1000101
applications inForMation
Operation Sequence
The LTC2495 acts as a transmitter or receiver, as shown
in Figure 6. The device may be programmed to perform
several functions. These include input channel selection,
measure the internal temperature, selecting the line fre-
quency rejection (50Hz, 60Hz, or simultaneous 50Hz and
60Hz), a 2x speed mode and gain.
Continuous Read
Inapplicationswheretheinputchannel/configurationdoes
not need to change for each cycle, the conversion can be
continuously performed and read without a write cycle
(see Figure 7). The configuration/input channel remains
unchanged from the last value written into the device. If
the device has not been written to since power up, the
configuration is set to the default value. At the end of a
read operation, a new conversion automatically begins.
At the conclusion of the conversion cycle, the next result
may be read using the method described above. If the
conversion cycle is not concluded and a valid address
selects the device, the LTC2495 generates a NACK signal
indicating the conversion cycle is in progress.
Continuous Read/Write
Once the conversion cycle is concluded, the LTC2495
can be written to and then read from using the repeated
START (Sr) command.
Figure 8 shows a cycle which begins with a data write, a
repeated START, followed by a read and concluded with a
STOP command. The following conversion begins after all
S
ACK
DATA
Sr
DATA TRANSFERRING
P
SLEEP
DATA INPUT/OUTPUT
CONVERSION
7-BIT ADDRESS
R/W
2495 F05
7-BIT ADDRESS
CONVERSION
SLEEP
DATA OUTPUT
7-BIT ADDRESS
S
R
ACK
READ
P
2495 F07