What is the Chip Address for ADAU1761 in SPI mode?
Trying to understand the ADAU1761 SPI mode chip address. In I2C mode, it looks like it is 0x38H. Table 22 of the data sheet suggests that the chip address is 00 followed by R/W bit, with bit 0 going out the COUT pin first. Table 23 shows Byte 0 as chip_address[6:0],R/W which almost suggests that bit 6 goes first with R/W following bit 0.
Can someone help clarify what the chip address should be and what the format is? A figure for SPI transfer similar to Figure 49 would be most helpful.
Audio Signal Processors
SigmaDSP Audio Processors
adau1761
Hello,
The chip address is zero (expressed in 7 bits), with a R/W bit at the end. This means for a read, the address byte is 0x01, and for a write, the address byte is 0x00.
chip_address[6:0] simply means the 7 bits of the chip address, which are 0000000.
R/W is either a 1 or 0.
So, you get either 00000000 for a write or 00000001 for a read.
Here are the relevant figures from the datasheet:
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