L99LD02 datasheet(48/66 Pages) STMICROELECTRONICS

48 / 66 page

Serial peripheral interface (ST SPI standard)

L99LD02

48/66

DS12448 Rev 3

Address:

0x03Fh

Type:

Read / Write allowed in NM only when CTM_TRIM_COD = 100 and EOT = 0

5.7.4

Customer test and trimming procedure description

General description

The writing procedure is performed connecting the two terminals of the anti-fuse capacitor

at 15 V and ground respectively. This is achieved by providing 15V on VS battery pin.

After this phase, the capacitor is burnt and behaves like a resistance; its value (the residual

resistance) strictly depends on the effectiveness of the burning procedure. During physical

reading operation, the residual resistance is compared with a fixed threshold. If the residual

resistance is greater than threshold a bit 0 is given, and the OTP cell is considered

unwritten, otherwise a bit 1 is given and the OTP cell is considered written. Blank check

reading is executed to verify that all anti-fuses are unwritten after fabrication, while margin

mode, usually performed immediately after the burning process, is used to verify if burned

cells are properly written.

98765432

DEF_BST_SLP_CTRL

Reserved

Table 28. CT: Ctm Trimming Register 2

Bit

Default

Name

Comment

23÷21

000

CTM_TRIM_COD

Operation Code for Trimming Operation:

001 --> Standard Read

010 --> Margin Mode Read

011 --> Blank Check

100 --> Burn

111 --> End of Trimming

20÷19

DEF_BST_N_PHASE

DEF_MS

17÷16

DEF_BST_DIS

15÷10

000000

DEF_BST_SLP_CTRL

9÷8

DEF_BST_GM_OTA

DEF_BST_DIS_OTA

DEF_DITH_EN

EOT

End of Ctm Trimming

4÷1

0000

Reserved: empty

Parity Bit

ODD Parity Bit Check

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