Datasheet

STPM01 Theory of operation
Doc ID 10853 Rev 8 41/60
division makes sense with the MSB of data value because the MSN of it holds the parity
code rather than useful data.
The sequence of data record during the reading operation is fixed. Normally, an application
will read 1st,.., 6th data record, the 7th and 8th data record would read only when it need to
fetch the configuration data. However, an application may apply a precharge command (see
Tabl e 1 7 ) prior reading phase. This command forces the device to respond with the
sequence 5th,.., 8th, 1st,.., 4th. Such change of sequence can be used to skip the first four
data records.
The timing diagram of the reading operation is shown on the Figure 26. One can see the
latching and beginning of shifting phase of the first byte (0x5F) of the first data record and
end of reading. Also, both alternatives to reset the internal transmission serial clock counter
is shown in signal SYN.
Figure 25. Data records reconstruction
Figure 26. Timing for data records reading
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
SCLNLC
SDATD
SYN
SCS
1st byte
last bit of 32nd byte
f(read)
SCLNLC
SDATD
SYN
SCS
1st byte
last bit of 32nd byte
f(read)