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Communication Interface

I²C Communication

Application Note

• PUBLIC

AN000710

• v1-00 • 2020-Jul-21

12

│ 9

2.4

Customer Signature Calculation

Before Burn procedure, the cust_signature has to be calculated and stored in the P2RAM_BYTE_16

(0x1F) register.

The signature is used for a diagnostic check during power up by BIST module (Built-In-Self-Test). The

stored signature will be compared IC internally to a calculated value during powering up. The

Figure 9:

Signature CRC-8 Calculation

Customer registers: P2RAM_BYTE_13 (0x1C), P2RAM_BYTE_14 (0x1D) and P2RAM_BYTE_15

(0x1E)

Code Example:

@content =($byte0, $byte1, $byte2, $byte3, $byte4, $byte5, $byte6, $byte7, $byte8,

$byte9, $byte10, $byte11, $byte12, $byte13, $byte14, $byte15);

$misr = 0;

for($i=12; $i< 15; $i++) {

$misr_shift = ($misr<<1);

$misr_xor = ($misr_shift ^ $content[$i]) & 0xFF;

$misr_msb = $misr/(128);

if ($misr_msb eq 0) {

$misr = $misr_xor;

}

else

{

$misr = ($misr_xor ^ 29) & 0xFF;

}