SEA01 datasheet(13/24 Pages) STMICROELECTRONICS

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SEA01

Online digital trimming procedure

If the parity check fails (command or data), the command is not executed (VrefV register

doesn’t change) and the internal parity fail flag is activated. If the parity fail flag was

activated from the previous communication, the command is not executed even if the parity

check is ok. To reset the parity fail flag the user has to perform a read command.

If the parity check is ok, VrefV is changed according to the content in the VrefV register

resulting in a direct change from the old to the new value.

2.2

2.555

2.4

2.560

2.6

2.565

2.8

2.570

2.575

-0

2.500

-0.2

2.495

-0.4

2.490

-0.6

2.485

-0.8

2.480

-1

2.475

-1.2

2.470

-1.4

2.465

-1.6

2.460

-1.8

2.455

-2

2.450

-2.2

2.445

-2.4

2.440

-2.6

2.435

-2.8

2.430

-3

2.425

1. The device is initialized with the default value of 0000000 (i.e. the 0% trim value for VrefV). If the device has already been

burned once, the default value is the one stored in the first OTP memory.

2. The 0% trim value was assumed 2.5 V as an example, but this value can be in the range [2.48 V, 2.52 V]. The trimming

range is proportional to the trimming value [-3% , + 3%] with a trimming step of 0.2% referenced to the 0% trim value.

Table 6. VrefV values (continued)

Data bits

Trim step [%]

VrefV value [V]

Default(1)

MSB

LSB

D8 (pck)

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