SEA01 datasheet(11/24 Pages) STMICROELECTRONICS

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SEA01

Online digital trimming procedure

3.3

Device commands

The commands are implemented with a one-byte word including a bit for parity check (LSB).

C8 = parity check bit.

The parity check has the following structure.

C8 = C1

⊕ C2 ⊕ C3 ⊕ C4 ⊕ C5 ⊕ C6 ⊕ C7.

The possible commands are summarized in Table 5. If the device receives a command not

specified in Table 5 or in case of failure of parity check, no command is executed and a fail

flag is internally activated.

C8 = parity check bit data.

The data are implemented with a one-byte word including a bit for parity check (LSB).

D8 = parity check bit.

The parity check has the following structure.

D8 = D1

⊕ D2 ⊕ D3 ⊕ D4 ⊕ D5 ⊕ D6 ⊕ D7.

If the parity bit check is not correct, the data is not acquired, and the value on VrefV or VrefI

(depending on the command) will be not updated. An internal parity fail flag is activated and

it is not possible to execute any command before a read command.

3.4

Emulation commands

It is possible to change both VrefV and VrefI values by writing to the volatile memory (VrefV

and VrefI register) before deciding to permanently store the values in the device.

Changing VrefV and VrefI is done independently.

MSB

LSB

Table 5. Command mapping

Command code

Emulate/read VrefV

01000

Emulate/read VrefI

00011

Write NVM

1010

Reload NVM

MSB

LSB

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