AD2S1205 datasheet(20/21 Pages) AD

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AD2S1205

Rev. A | Page 19 of 20

CONNECTING TO THE DSP

The AD2S1205 serial port is ideally suited for interfacing to DSP-

configured microprocessors. Figure 16 shows the AD2S1205

interfaced to an ADMC401, one of the DSP-based motor

controllers.

The on-chip serial port of the ADMC401 is used in the following

configuration

•

Alternate framing transmit mode with internal framing

(internally inverted)

•

Normal framing receive mode with external framing

(internally inverted)

•

Internal serial clock generation

In this configuration, the internal TFS signal of ADMC401

is used as an external RFS to fully control the timing of

data received, and the same TFS is connected to RD of the

AD2S1205. In addition, the ADMC401 provides an internal

continuous serial clock to the AD2S1205. The SAMPLE signal

on the AD2S1205 can be provided either by using a PIO or by

inverting the PWMSYNC signal to synchronize the position

and velocity readings with the PWM switching frequency. CS

and RDVEL can be obtained using two PIO outputs of the

ADMC401. The 12 bits of significant data and the status bits

are available on each consecutive negative edge of the clock

after the RD signal goes low. Data is clocked from the AD2S1205

into the data receive register of the ADMC401. This is internally

set to 16 bits (12 data bits, 4 status bits) because 16 bits are

received overall. The serial port automatically generates an

internal processor interrupt. This allows the ADMC401 to

read all 16 bits and then continue to process data.

All ADMC401 products can interface to the AD2S1205 by using

similar interface circuitry.

SCLK

TFS

RFS

PWMSYNC

PIO

SCLK

SOE

SAMPLE

RDVEL

ADMC401

AD2S1205

Figure 16. Connecting to the ADMC401

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