AD5662ARJ-1REEL7 datasheet(17/24 Pages) AD

Part #	AD5662ARJ-1REEL7

Description	16-Bit nanoDAC in a SOT-23

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Manufacturer	AD [Analog Devices]

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AD5662

Rev. A | Page 17 of 24

AD5662 to 80C51/80L51 Interface

AD5662 to MICROWIRE Interface

Figure 39 shows a serial interface between the AD5662 and the

80C51/80L51 microcontroller. The setup for the interface is as

follows. TxD of the 80C51/80L51 drives SCLK of the AD5662,

while RxD drives the serial data line of the part. The SYNC

signal is again derived from a bit-programmable pin on the port.

In this case, port line P3.3 is used. When data is to be transmitted

to the AD5662, P3.3 is taken low. The 80C51/80L51 transmits

data in 8-bit bytes only; thus only eight falling clock edges occur

in the transmit cycle. To load data to the DAC, P3.3 is left low

after the first eight bits are transmitted, and a second write cycle

is initiated to transmit the second byte of data. P3.3 is taken

high following the completion of this cycle. The 80C51/80L51

outputs the serial data in a format that has the LSB first. The

AD5662 must receive data with the MSB first. The 80C51/80L51

transmit routine should take this into account.

Figure 40 shows an interface between the AD5662 and any

MICROWIRE-compatible device. Serial data is shifted out on

the falling edge of the serial clock and is clocked into the AD5662

on the rising edge of the SK.

MICROWIRE*

AD5662*

*ADDITIONAL PINS OMITTED FOR CLARITY

CS

SK

SO

SYNC

SCLK

DIN

Figure 40. AD5662 to MICROWIRE Interface

80C51/80L51*

AD5662*

*ADDITIONAL PINS OMITTED FOR CLARITY

P3.3

TxD

RxD

SYNC

SCLK

DIN

Figure 39. AD5662 to 80C51/80L51 Interface

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AD5662ARJ-1REEL7 Datasheet(PDF) 17 Page - Analog Devices

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