AD5380 datasheet(29/34 Pages) AD

29 / 34 page

PRELIMINARY TECHNICAL DATA

REV. PrF 09/2003

AD5380

–29–

The AD5380 can be interfaced to a variety of 16-bit

microcontrollersor DSP processors. Figure 14 shows the

AD5380 family interfaced to a generic 16-bit

microcontroller/DSP processor. The lower address lines

from the processor are connected to A0 to A5 on the

AD5380 as shown. The upper address lines are decoded to

provide a CS, LDAC signals for the AD5380. The fast

interface timing of the AD5380 allows direct interface to a

wide variety of microcontrollers and DSPs as shown in

Figure 14.

AD5380 to MC68HC11

The Serial Peripheral Interface (SPI) on the MC68HC11

is configured for Master Mode (MSTR = 1), Clock Po-

larity Bit (CPOL) = 0 and the Clock Phase Bit (CPHA)

= 1. The SPI is configured by writing to the SPI Control

User

Manual

. SCK of

the 68HC11 drives the SCLK of the AD5380, the MOSI

output drives the serial data line (DIN) of the AD5380 and

the MISO input is driven from DOUT. The SYNC signal is

derived from a port line (PC7). When data is being

transmitted to the AD5380, the SYNC line is taken low

(PC7). Data appearing on the MOSI output is valid on the

falling edge of SCK. Serial data from the 68HC11 is

transmitted in 8-bit bytes with only eight falling clock

edges occurring in the transmit cycle.

AD5380 to PIC16C6x/7x

The PIC16C6x/7x Synchronous Serial Port (SSP) is

configured as an SPI Master with the Clock Polarity bit =

0. This is done by writing to the Synchronous Serial Port

Control Register(SSPCON). See user PIC16/17

Mi-

crocontroller

User

Manual

. In this example I/O

port RA1 is being used to pulse SYNC and enable the

serial port of the AD5380. This microcontroller

transfers only eight bits of data during each serial transfer

operation; therefore, three consecutive read/write opera-

tions are needed depending on the mode. Figure 16 shows

the connection diagram.

MISO

SCK

MC68HC11

RESET

SCLK

SDO

DIN

SYNC

AD538X

DVDD

SPI/I2C

PC7

SER/PAR

MOSI

Figure 15 . AD5380 -MC68HC11 Interface

SCK/RC3

PIC16C6X/7X

RESET

SCLK

SDO

DIN

SYNC

AD538X

DVDD

SPI/I2C

RA1

SER/PAR

SDO/RC5

SDI/RC4

Figure 16 . AD5380 -PIC16C6X/7X Interface

RxD

TxD

8XC51

RESET

SCLK

SDO

DIN

SYNC

AD538X

DVDD

SPI/I2C

P1.1

SER/PAR

Figure 17 . AD5380 - 8051 Interface

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