CAT34TS02 Datasheet, PDF (10/22 Pages) ON Semiconductor – Digital Output Temperature Sensor with On-board SPD EEPROM

CAT34TS02
READ OPERATIONS
Immediate Read
Upon power-up, the address counters for both the
Temperature Sensor (TS) and on-board EEPROM
are initialized to 00h. The TS address counter will
thus point to the Capability Register and the
EEPROM address counter will point to the first
location in memory. The two address counters may
be updated by subsequent operations.
A CAT34TS02 presented with a Slave address
containing a ‘1’ in the R/¯W¯ position will acknowledge
the Slave address and will then start transmitting
data being pointed at by the current EEPROM data
or respectively TS register address counter. The
Master stops this transmission by responding with
NoACK, followed by a STOP (Figure 9).
Selective Read
The Read operation can be started at an address
different from the one stored in the respective
address counters, by preceeding the Immediate
Read sequence with a ‘data less’ Write operation.
The Master sends out a START, Slave address and
address byte, but rather than following up with data
(as in a Write operation), the Master then issues
another START and continuous with an Immediate
Read sequence (Figure 10).
Sequential EEPROM Read
EEPROM data can be read out indefinitely, as long
as the Master responds with ACK (Figure 11). The
internal address count is automatically incremented
after every data byte sent to the bus. If the end of
memory is reached during continuous Read, then
the address counter ‘wraps-around’ to beginning of
memory, etc. Sequential Read works with either
Immediate Read or Selective Read, the only
difference being that in the latter case the starting
address is intentionally updated.
Doc. No. MD-1129 Rev. G
10
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Characteristics subject to change without notice