EVAL-AD5680EB AD [Analog Devices], EVAL-AD5680EB Datasheet - Page 13

• Manufacturer Part Number: EVAL-AD5680EB
• Description: 5 V 18-Bit nanoDAC in a SOT-23
• Manufacturer: AD [Analog Devices]

MICROPROCESSOR INTERFACING
AD5680 to Blackfin® ADSP-BF53x Interface
Figure 27 shows a serial interface between the AD5680 and
the Blackfin ADSP-BF53x microprocessor. The ADSP-BF53x
processor family incorporates two dual-channel synchronous
serial ports, SPORT1 and SPORT0, for serial and multiprocessor
communications. Using SPORT0 to connect to the AD5680, the
setup for the interface is as follows. DT0PRI drives the DIN pin
of the AD5680, while TSCLK0 drives the SCLK of the part. The
SYNC is driven from TFS0.
AD5680 to 68HC11/68L11 Interface
Figure 28 shows a serial interface between the AD5680 and the
68HC11/68L11 microcontroller. SCK of the 68HC11/68L11
drives the SCLK of the AD5680, while the MOSI output drives
the serial data line of the DAC.
The SYNC signal is derived from a port line (PC7). The setup
conditions for correct operation of this interface are as follows.
The 68HC11/68L11 is configured with its CPOL bit as 0 and its
CPHA bit as 1. When data is being transmitted to the DAC, the
SYNC line is taken low (PC7). When the 68HC11/68L11 is
configured this way, data appearing on the MOSI output is valid
on the falling edge of SCK. Serial data from the 68HC11/68L11
is transmitted in 8-bit bytes with only eight falling clock edges
occurring in the transmit cycle. Data is transmitted MSB first. To
load data to the AD5680, PC7 is left low after the first eight bits
are transferred, and a second serial write operation is performed
to the DAC; PC7 is taken high at the end of this procedure.
*ADDITIONAL PINS OMITTED FOR CLARITY
*ADDITIONAL PINS OMITTED FOR CLARITY
68HC11/68L11*
ADSP-BF53x*
Figure 27. AD5680 to Blackfin ADSP-BF53x Interface
Figure 28. AD5680 to 68HC11/68L11 Interface
TSCLK0
DTOPRI
TFS0
MOSI
SCK
PC7
AD5680*
SYNC
DIN
SCLK
AD5680*
SYNC
SCLK
DIN
Rev. 0 | Page 13 of 20
AD5680 to 80C51/80L51 Interface
Figure 29 shows a serial interface between the AD5680 and the
80C51/80L51 microcontroller. The setup for the interface is as
follows. TxD of the 80C51/80L51 drives SCLK of the AD5680,
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 AD5680, 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
AD5680 must receive data with the MSB first. The 80C51/80L51
transmit routine should take this into account.
AD5680 to MICROWIRE Interface
Figure 30 shows an interface between the AD5680 and any
MICROWIRE-compatible device. Serial data is shifted out on
the falling edge of the serial clock and is clocked into the AD5680
on the rising edge of the SK.
*ADDITIONAL PINS OMITTED FOR CLARITY
*ADDITIONAL PINS OMITTED FOR CLARITY
80C51/80L51*
MICROWIRE*
Figure 29. AD5680 to 80C51/80L51 Interface
Figure 30. AD5680 to MICROWIRE Interface
P3.3
RxD
TxD
SO
CS
SK
AD5680*
SYNC
SCLK
DIN
AD5680*
SYNC
SCLK
DIN
AD5680