PCM2704 with external EEPROM

Ondrej Petrlik

Other Parts Discussed in Thread: PCM2704

Hello, i just build DAC with PCM2704. Everything work good until I connect EEPROM. My ROM is BR24L01A-W type with loaded data examle from PCM2704 datasheet. But nothing is doing. Address of ROM is set to 0x50. On logical analyzer i see communication from PCM2704 - write request, but speed of CLOCK is about 2MHz. In datasheet is maximum 100Khz. Where i get this overkill? I think it is too speedy for my normaly clocked EEPROM.

over 12 years ago

0 Patrick Galvin over 12 years ago

TI__Genius 16270 points

Ondrej,

In page 21 of the d/s, it mentions the device address of the EEPROM is fixed as 0xA0, instead of 0x50. Are you able to try with this address instead?

0 Ondrej Petrlik over 12 years ago in reply to Patrick Galvin

Prodigy 30 points

As I understand, 0x50 is b1010000 and A0 is b10100000. In my humble opinion last bite signalize read or write operation.

0 Patrick Galvin over 12 years ago in reply to Ondrej Petrlik

TI__Genius 16270 points

Ondrej,

Looking at the datasheet for the EEPROM, it seems the address is fixed at (1010000) then R/W, assuming A2-A0 are 0, which should be A0 with the read bit being 1 correct? Also can you send a schematic as well?

0 Ondrej Petrlik over 12 years ago in reply to Patrick Galvin

Prodigy 30 points

That is correct, all pins A I have grounded. And now i have EEPROM connected to 5V, not to 3.3V.

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PCM2704 with external EEPROM