MAX187EVKIT-DIP Maxim Integrated, MAX187EVKIT-DIP Datasheet - Page 9

• Manufacturer Part Number: MAX187EVKIT-DIP
• Description: Data Conversion IC Development Tools Programmers, Development Systems
• Manufacturer: Maxim Integrated
• Series: MAX187, MAX189r

Specifications of MAX187EVKIT-DIP

• Interface Type: QSPI, Serial (SPI, Microwire)
• Factory Pack Quantity: 1

The TMS320 subdirectory of the program disk contains
a demonstration program that interfaces the MAX187 to
Texas Instruments’ TMS320C3X Evaluation Module
(EVM), as shown in Figure 3. This demonstration
requires the additional software included with the
TMS320C3X EVM board, and is provided for the conve-
nience of programmers who are already familiar with
Texas Instruments’ TMS320 family of digital signal
processors. To connect the MAX187 EV kit to the
__________________TMS320 Interface
Figure 3. SPI Interface Schematic
Figure 4. MAX187 to SPI Interface Timing (CPOL = 0, CPHA = 0)
(MISO)
(SCK)
DOUT
SCLK
CS
68HC11
1
2
3
4
5
MAX187 Evaluation System/Evaluation Kit
MAX187 CONVERSION TIME: 8.5µs MAX
SPI SETUP TIME: 100ns MIN
SPI HOLD TIME: 100ns MIN
MAX187 SCK TO DOUT DELAY: 150ns MAX
SCLK PERIOD: (150ns + 100ns) (2) = 500ns
MISO
SCK
I/O
I/O
SS
_______________________________________________________________________________________
1
ACTUAL PERIOD =
10k
START BIT
+5V
1MHz
SHDN
CS
SCLK
DOUT
1
MAX187
= 1000ns
2
3
D11
5
4
TMS320C3X EVM, install a 2 x 5 pin ribbon-cable head-
er in the prototype area and wire it in accordance with
Table 7. The SHDN pin should be tied to 5V for normal
operation.
The demo software configures the TMS320C30 so that
FSR1 and DR1 are inputs, and CLKR1 and XF1 are out-
puts. The software uses the XF1 output to start a con-
version. The XF1 pulse drives the MAX187 chip-select
input. The CLKR1 output provides the serial clock to
the MAX187. Data output from the MAX187 is received
on the DR1 input. The FSR1 frame-start signal is also
tied to the data output, so the start bit from the MAX187
marks the beginning of the serial frame.
To read the MAX187, the software drives the XF1 out-
put low, then waits 8.5µs (the maximum conversion
time). It then enables the serial receive clock. The
MAX187 sends its start bit, followed by the serial data.
The demo software polls the serial receiver until a com-
plete frame has been received. Since only 12 of the 16
bits received are significant, the demo software right-
justifies the significant bits and removes the start bit,
then writes the 12-bit word to the TMS320C3XEVM’s
host data port.
For the complete ribbon-cable pinout, consult the
TMS320C3X Evaluation Module Technical Reference
that came with your TMS320C3X EVM.
D10
NOTE: TIMING DIAGRAM NOT DRAWN TO SCALE
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