LMH0324
ZHCSIC8B –APRIL 2016–REVISED JUNE 2018
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7.4.2.2 SPI Daisy Chain
The LMH0324 supports SPI daisy-chaining among multiple devices, as shown in Figure 15.
MISO
Device 1
Device 2
Device 3
Device N
Host
LMH0324
LMH0324
LMH0324
LMH0324
. . .
MOSI
MOSI
MISO
MOSI
MISO
MOSI
MISO
MOSI
MISO
SCK
SS
Figure 15. Daisy-Chain Configuration
Each LMH0324 device is directly connected to the SCK and SS_N pins of the host. The first LMH0324 device in
the chain is connected to the host’s MOSI pin, and the last device in the chain is connected to the host’s MISO
pin. The MOSI pin of each intermediate LMH0324 device in the chain is connected to the MISO pin of the
previous LMH0324 device, thereby creating a serial shift register. In a daisy-chain configuration of N x LMH0324
devices, the host conceptually sees a shift register of length 17 x N for a basic SPI transaction, during which
SS_N is asserted low for 17 x N clock cycles.
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