Datasheet

Host Processor Interface
3-3
EVM Operation
Table 3-3.DAC8571EVM Factory Default Jumper Setting
DAC8571 EVM CONFIGURATION
Reference
Jumper
Position
Function
W1 2-3 Power supply for the DAC8571 is 5 VA.
W2
1-2 DAC output is routed to J4-2.
W3 OPEN U2 is configured as unity gain op-amp.
W4 2-3 SDA is routed to SDATA..
W5 1-2 Negative supply rail of U2 op-amp is supplied with
V
SS.
W6 2-3 SCL is routed to SCLK.
W7 OPEN For U1 use only
W8 OPEN For U1 use only
W9 OPEN For I
2
C SDA bit-bang using the DSP
W10 CLOSE V
SENSE
is tied to V
OUT
for feedback.
W11 1-2
For U1 use only
W12 1-2
For U1 use only
W13 1-2
For U1 use only
W14 2-3 The 5 VD is routed for digital supply.
TP8 OPEN For connecting external V
REF
if desired
TP9 OPEN For tying V
DD
and V
REF
together and isolating it from
U1 and U8 (if all DUTs are installed)
3.2 Host Processor Interface
Because the host processor controls the DAC, proper operation depends on
the correct interface of the host processor and the EVM board. Properly written
code is also required to operate the DAC.
A host-platform-specific cable assembly connects the EVM to the host
processor through J2 for the I
2
C serial-control and data signals. The output is
monitored through J4.
An interface-adapter card is available for specific TI DSP starter kits as well
as for an MSP430 based microprocessor as mentioned in Chapter 1, section
1.3. Using the interface card alleviates the tedious task of building custom
cables and allows easy configuration of a simple evaluation system.
This DAC EVM interfaces with any host processor capable of I
2
C protocols or
the popular TI DSP. For more information regarding the serial interface of the
particular DAC installed, please refer to the specific DAC datasheet, as listed
in the Related Documentation from Texas Instruments section in the Preface
of this user’s guide.