STTS2002_11 STMICROELECTRONICS [STMicroelectronics], STTS2002_11 Datasheet - Page 37

• Manufacturer Part Number: STTS2002_11
• Description: 2.3 V memory module temperature sensor with a 2 Kb SPD EEPROM
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

STTS2002
5.6.2
5.6.3
5.6.4
Current address read - SPD
For the current address read operation, following a start condition, the bus master only
sends a device select code with the RW bit set to 1. The device acknowledges this, and
outputs the byte addressed by the internal address counter. The counter is then
incremented. The bus master terminates the transfer with a stop condition, as shown in
Figure
Sequential read - SPD
This operation can be used after a current address read or a random address read. The bus
master does acknowledge the data byte output, and sends additional clock pulses so that
the device continues to output the next byte in sequence. To terminate the stream of bytes,
the bus master must not acknowledge the last byte, and must generate a stop condition, as
shown in
The output data comes from consecutive addresses, with the internal address counter
automatically incremented after each byte output. After the last memory address, the
address counter ‘rolls-over’, and the device continues to output data from memory address
00h.
Acknowledge in read mode
For all read commands, the device waits, after each byte read, for an acknowledgment
during the 9
time, the device terminates the data transfer and switches to its standby mode.
Table 25
protection status.
Table 25.
Permanently
Protected
with SWP
Protected
protected
Status
Not
14, without acknowledging the byte.
and
Figure
th
Acknowledge when writing data or defining the write-protection
(instructions with R/W bit = 0)
Table 26 on page 38
bit time. If the bus master does not drive serial data (SDA) low during this
Page or byte write in
Page or byte write in
Page or byte write
14.
lower 128 bytes
lower 128 bytes
PSWP, SWP or
PSWP, SWP or
Instruction
PSWP
CWP
CWP
CWP
SWP
Doc ID 15389 Rev 5
show how the Ack bits can be used to identify the write-
NoAck
NoAck
Ack
Ack
Ack
Ack
Ack
Ack
Ack
significant
significant
significant
significant
significant
Address
Address
Address
Address
Not
Not
Not
Not
Not
NoAck
NoAck
Ack
Ack
Ack
Ack
Ack
Ack
Ack
Data byte
significant
significant
significant
significant
significant
Data
Data
Data
Not
Not
Not
Not
Not
SPD EEPROM operation
NoAck
NoAck
NoAck
NoAck
Ack
Ack
Ack
Ack
Ack
cycle(t
Write
Yes
Yes
Yes
Yes
No
No
No
No
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