ADL6337ACRZA-R7 datasheet(36/53 Pages) AD

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Data Sheet

ADL6337

CONFIGURING MULTIPLE CHIPS TO SHARE THE SPI BUS

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Rev. E | 36 of 53

Up to eight ADL6337 devices can be addressed using the same 3-

or 4-wire SPI, which means no extra CS line is needed for each

device. For this capability, the chip address pins (CS_A2, CS_A1,

CS_A0) of the ADL6337 are used to identify the chip with the SPI

write chip address prefix. See the SPI interface port as shown in

Figure 2.

The ADL6337 ignores any writes to addresses where the six MSBs

are not equal to the chip address as set by the chip address

pins. It only accepts access for addresses where the six MSB chip

address prefix is equal to the chip address pins. The broadcasting

software reset mode in Register 0x000 allows for an exception. All

ADL6337 chips on the shared bus can accept a 0x81 software reset

in Register 0x000 from the SPI host controller.

Figure 120 shows how to configure the chip address pins CS_CA2,

CS_CA1, and CS_CA0 with the associated chip address prefix bits.

Figure 120. Configuring Multiple Chips to Share the SPI Bus

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