BUF12840: FFh input for MSB_LSB when BANK1 is not used

Satoshi Yone

Part Number: BUF12840

Hi, Team,

For BANK1 non-use pin configuration, is it ok to input FFh for both MSB and LSB when BUF12840 read EEPROM at the start up? The IC is 10 bit, but the customer set all 1 including the upper 6bit.

Configuration
BKSEL pin：0V fix
　　②Input Data（EEPROM data）：
　　　　EEPROM address 00h～17h（for BANK0）
　　　　　　　　：MSB data 00h～03h
　　　　　　　　:LSB data 00h～FFh
　　　　EEPROM address 18h～2Fh（for BANK1）
　　　　　　　　：MSB data FFh
　　　　　　　　:LSB data FFh

Best Regards,
Satoshi Yone

over 6 years ago

0 Grant Falkenburg over 6 years ago

TI__Intellectual 1965 points

Hi Satoshi,

Let me contact the expert who supports this part. Please give them until September 17th to respond.

Best,

Grant

0 Costin Cazana over 6 years ago

TI__Expert 4940 points

Hi,

As long as BKSEL=Low data loaded to address 18h-2Fh doesn't affect the DAC's output.

Personally for safety I prefer to set all unused Bank1 DAC's to min ( all zeroes ). Just in case BKSEL goes high( hardware or software issue ) , output voltage will be low.

Regards,

Costin

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BUF12840: FFh input for MSB_LSB when BANK1 is not used