Si4455
5. Controller Interface
5.1. Serial Peripheral Interface
The Si4455 communicates with the host MCU over a standard 4-wire serial peripheral interface (SPI): SCLK, SDI,
SDO, and nSEL. The SPI interface is designed to operate at a maximum of 10 MHz. The SPI timing parameters
are listed in Table 11. The host MCU writes data over the SDI pin and can read data from the device on the SDO
output pin. Figure 8 shows an SPI write command. The nSEL pin should go low to initiate the SPI command. The
first byte of SDI data will be one of the API commands followed by n bytes of parameter data which will be variable
depending on the specific command. The rising edges of SCLK should be aligned with the center of the SDI data.
Table 11. Serial Interface Timing Parameters
Symbol
t CH
t CL
Parameter
Clock high time
Clock low time
Min (ns)
40
40
SCLK
Diagram
t DS
Data setup time
20
t SS
t CL
t CH
t DS t DH
t DD
t SH
t DE
t DH
Data hold time
20
SDI
t DD
t EN
t DE
Output data delay time
Output enable time
Output disable time
20
20
50
SDN
SDO
t SS
t SH
t SW
Select setup time
Select hold time
Select high period
20
50
80
nSEL
t EN
t SW
nSEL
SDO
SDI
API Command
ParamByte 0
ParamByte n
SCLK
Figure 8. SPI Write Command
22
Rev 1.1
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