AN3209 datasheet(13/42 Pages) STMICROELECTRONICS

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AN3209

Component overview

Doc ID 17419 Rev 2

13/42

System bytes

●

Status byte

The Status byte shows the current application state. Refer to Table 5 for the meaning of

each possible value.

●

Overwrite byte

During the acquisition, the temperature values are stored in the memory. When the

memory is full, the application can either stop or rewrite data starting from the first

address, depending on the value of the Overwrite byte (see Table 6).

●

Delay byte

The Delay byte contains the value of the acquisition rate (see Table 7):

●

Nb Temp bytes

NbTemp bytes contains the number of temperature values stored in the memory. It

consists in two hexadecimal-coded bytes. The number of temperature values is the

concatenation of Nb Temp[1] and Nb Temp[0] where Nb Temp[0] is the LSB and Nb

...

2016

8064

Temp4092

[1]

Temp4092

[0]

Temp4091 [1]

Temp4091 [0]

Table 5.

Status byte values

Status byte value

Description

0x11

START

0X22

PAUSED

0x33

RUNNING

0x44

STOPPED

0x55

UPDATE

0x66

OTHER

Table 6.

Overwrite byte values

Overwrite byte value

Description

0x11

Overwrite authorized

Any other values

Overwrite non authorized

Table 7.

Delay byte values

Delay byte value

Description (s)

Comment

0x0D

Temperature measured and saved every second

0x10

Temperature measured and saved every 30 seconds

Table 4.

M24LR64-R-R memory organization

Sector

number

RF block

address

i2C byte

address

bit [31:24]

bit [23:16]

bit [15:8]

bit [7:0]

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