L9965P datasheet(84/104 Pages) STMICROELECTRONICS

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3.18.2

NVM data integrity checks

NVM content can be categorized in two main groups: trimming/calibration data (used to guarantee function

accuracy) and configuration data (used to IC configuration). All this data is organized in sectors, each of them

individually protected by CRC. Trimming/calibration data and configuration data are in different sectors.

Every time the IC performs an NVM download operation (either automatic or user-driven), an integrity check

against the NVM CRC (sector by sector) is performed as well. In case of check failure, the following actions are

performed:

•

The sector data that fails CRC check is not downloaded into the local registers and is replaced by all zeros.

Hence, depending on the sector content, either function accuracy will not be guaranteed or IC expected

configuration will not be applied.

•

In case at least one of the trimming/calibration sectors has failed the CRC check,

NVM_CRC_TRIM_CAL_FAIL latch is set (clear-upon-read). When NVM_CRC_FAIL_MSK is set to 1, this

flag can always be cleared.

•

In case at least one of the IC configuration sectors has failed the CRC check, NVM_CRC_CFG_FAIL latch

is set (clear-upon-read). When NVM_CRC_FAIL_MSK is set to 1, this flag can always be cleared.

•

The deployment is inhibited and FAULTN is asserted but there is no interruption/inhibition of other IC

functionalities. It is possible to mask this behavior setting the NVM_CRC_FAIL_MSK bit.

Every time the user triggers an NVM upload and refresh operation, the corresponding sector CRC is updated as

well; this is done by IC automatically.

3.18.3

NVM electrical parameters

All parameters are tested and guaranteed in the following conditions, unless otherwise noted: all supplies

according to the Table 3; TJ according to the Table 2.

Table 89. NVM electrical parameters

Symbol

Parameter

Test condition

Min Typ Max

Unit

NNVM_WRITE_CYCLES

Number of allowed NVM write cycles to guarantee

data retention

Guaranteed by SCAN

cycles

tNVM_UPLOAD

NVM upload time duration (as sum of write and

download operations)

Guaranteed by SCAN

tNVM_DOWNLOAD

NVM download time duration

Guaranteed by SCAN

500

µs

L9965P

Functional description

DS14702 - Rev 4

page 84/104

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