ADIS16135 SPI Interface Configuration

Question

How do I configure the ADUC7026 to communicate with the SPI on the ADIS16135?

NevadaMark · Accepted Answer

Embedded processors typically support SPI communications with multi-purpose SPI ports that have some configurable parameters. These parameters could include serial protocol (SPI, I2C, etc), data length, clock polarity, clock phase, bit order, serial clock rate, etc. While it is important to check the sensor's datasheet for product-specifc settings, Table 7 in the ADIS16135 Datasheet (page 8) offers a summary of typical configuration parametes to look for, which are typically found in serial port control registers. Table 7's contents are provide here, for convenience.

Processor Setting	Description
Master	The ADIS16135 operates as a slave.
SCLK Rate ≤ 2 MHz	Maximum serial clock rate.
SPI Mode 3	CPOL = 1 (polarity), CPHA = 1 (phase).
MSB-First Mode	Bit sequence.
16-Bit Mode	Shift register/data length.

Processor Setting 
 Description

Master 
 The ADIS16135 operates as a slave.

SCLK Rate ≤ 2 MHz 
 Maximum serial clock rate.

SPI Mode 3 
 CPOL = 1 (polarity), CPHA = 1 (phase).

MSB-First Mode 
 Bit sequence.

16-Bit Mode 
 Shift register/data length.)

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ADIS16135 SPI Interface Configuration