AD6636PCB datasheet(51/72 Pages) AD

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AD6636

Rev. 0 | Page 51 of 72

SRFS

SCLK

SCS

SMODE

SDI

MODE

Figure 46. SPORT Serial Write

SCLK

SCS

SMODE

SDI

SDO

MODE

INSTRUCTION BYTE 1

INSTRUCTION BYTE 2

VALID OUTPUT

SRFS

STFS

Figure 47. SPORT Serial Readback

If the example is for MSBFIRST = 1, then the instruction words

are 0x07 (Address 7) and 0x87 (MSB = 1 for read, followed by

the number of address locations to read). The data coming out

on the SDO corresponds to Addresses 0x07 to 0x01, in that

order. The instruction words are written MSB first and data

comes out on the SDO with the MSB first.

Connecting the AD6636 Serial Port to a Blackfin DSP

In SPI mode, the Blackfin DSP must act as a master to the

AD6636 by providing the SCLK. SDO is an open-drain output,

so that multiple slave devices can be connected together.

Figure 48 shows typical interconnections.

SMODE

SCLK

SPISS

SRFS

AND

STFS

SCK

MOSI

MISO

SCS

SDO

SDI

PF2

MODE

BLACKFIN

(MASTER)

AD6636

(SLAVE)

PROGRAMMABLE FLAG

VDDIO

GND

Figure 48. SPI Mode Serial Port Connections to Blackfin DSP

In SPORT mode, the Blackfin provides the SCLK, SRFS, and

STFS signals, as shown in Figure 49.

AD6636PCB Datasheet(PDF) 51 Page - Analog Devices

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