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Si4355
5. Controller Interface
5.1. Serial Peripheral Interface (SPI)
The Si4355 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 10. The host MCU writes data over the SDI pin and can read data from the device on the SDO
output pin. Figure 7 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 10. Serial Interface Timing Parameters
Symbol
t CH
t CL
t DS
Parameter
Clock high time
Clock low time
Data setup time
Min (ns)
40
40
20
SCLK
Diagram
t DH
Data hold time
20
t SS
t CL
t CH
t DS t DH
t DD
t SH
t DE
t DD
Output data delay
time
20
SDN
t EN
t DE
t SS
t SH
Output enable time
Output disable time
Select setup time
Select hold time
20
50
20
50
SDO
nSEL
t EN
t SW
t SW
nSEL
SDO
Select high period
80
SDI
API Command
ParamByte 0
ParamByte n
SCLK
Figure 7. SPI Write Command
The Si4355 contains an internal MCU which controls all the internal functions of the radio. For SPI read
commands, a typical communication flow of checking clear-to-send (CTS) is used to make sure the internal MCU
has executed the command and prepared the data to be output over the SDO pin. Figure 8 demonstrates the
general flow of an SPI read command. Once the CTS value reads FFh, the read data is ready to be clocked out to
the host MCU. The typical time for a valid FFh CTS reading is 20 μs. Figure 9 demonstrates the remaining read
cycle after CTS is set to FFh. The internal MCU will clock out the SDO data on the negative edge so the host MCU
should process the SDO data on the rising edge of SCLK.
Rev 1.0
19
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