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datasheet Page25有介绍：www.ti.com/.../pcm1795.pdf
7.5.4.1 Slave Address
The PCM1795 has 7 bits for its own slave address, as shown in Figure 45. The first 5 bits (MSBs) of the slave
address are factory preset to 10011. The next 2 bits of the address byte are the device select bits that can be
user-defined by the ADR1 and ADR0 terminals。
