Serial Peripheral Interface (SPI)

The SC1905 contains a microprocessor that is executing firmware. The system software referred to henceforth as

the "host", communicates with the firmware through a handshaking protocol called the message protocol. The host

configures the SC1905 by writing to various parameters stored in an EEPROM contained within the SC1905, or by

issuing commands to the firmware through the message protocol. All this communication is done through a 4-wire Serial

Peripheral Interface (SPI).

Detailed information on the message protocol, accessing EEPROM, etc. is contained in the SC1905 SPI Programming

Guide. Figure 1 shows the timing relationships between the SPI signals. Refer to Table 1.

SSN

SCLK

SDI

SDO

Figure 1. Serial Interface Timing Diagram

Table 1. Serial Interface Timing Requirements

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

Minimum Select Setup Time

100

ns

Minimum Select Hold Time

250

ns

Minimum Select Disable Time

100

ns

Minimum Data Setup Time

25

ns

Minimum Data Hold Time

45

ns

Maximum Rise Time

25

ns

Maximum Fall Time

25

ns

Minimum Clock Period

250

ns

Minimum Clock High Time

100

ns

Maximum Time to Output Valid

100

ns

Maximum Output Data Disable

50

ns

SC1905

698MHz to 3800MHz RF Power Amplifier Linearizer

(RFPAL)

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