Datasheet

Theory of operation STPM10
36/53 Doc ID 17728 Rev 4
significant nibble (MSN, LSN). This division makes sense with the MSB of the data value
because its MSN holds the parity code rather than useful data.
The sequence of the data record during the read operation is fixed. Normally, an application
reads the 1st through the 6th data record; the 7th and 8th data record would be read only
when it needs to fetch the configuration data. However, an application may apply a
precharge command (see Ta ble 12 ) prior to the reading phase. This command forces the
device to respond with the sequence 5th - 8th, 1st - 4th. Such a change of sequence can be
used to skip the first four data records.
The timing diagram of the reading operation is shown in Figure 24. One can see the latching
and beginning of the shifting phase of the first byte (0x5F) of the first data record, and the
end of reading. Also, both alternatives for resetting the internal transmission serial clock
counter are shown in signal SYN.
Figure 23. Data record reconstruction
Figure 24. Timing for data record 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)