Texas Instruments DACx750EMC-EVM Kit, Руководство пользователя

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TUSB3210
8052 C
m
with USB Interface
and UART
8K × 8-byte
EEPROM
+3.3 V
USB
+5 V
Power-On Reset
SM-USB-DIG Platform
T
o T
est Board
T
o Computer and Power Supplies
Power
Switching
Switched
Power
USB Bus
from
Computer
USB Power
+5.0 V
+3.0 V
VDUT
(Hi-Z, 3.3 V, or 5 V)
Buffers and
Level Translators
I C and SPI
Control and
Measure Bits
2
+3.3-V
Regulator
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EVM Hardware Setup
2.2 Signal Definitions of J1 (10-Pin Male Connector Socket)
Table 3 shows the pinout for the 10-pin connector socket used to communicate between the EVM and the
SM-USB-DIG. Note that the I
2
C communications lines (I2C_SCL and I2C_SDA1) are not used.
Table 3. SM-USB-DIG Connector
Pin On U1 Signal Description
1 I2C_SCL I2C Clock Signal (SCL)
2 CTRL/MEAS4 GPIO – Control Output or Measure Input
3 I2C_SDA1 I2C Data Signal (SDA)
4 CTRL/MEAS5 GPIO – Control Output or Measure Input
5 SPI_DOUT1 SPI Data Output (MOSI)
Switchable DUT Power Supply: +3.3V, +5V, Hi-Z (Disconnected).
6 VDUT
Note: When VDUT is Hi-Z all Digital I/O are Hi-Z as well.
7 SPI_CLK SPI Clock Signal (SCLK)
8 GND Power Return (GND)
9 SPI_CS1 SPI Chip Select Signal (CS)
10 SPI_DIN1 SPI Data Input (MISO)
2.3 Theory of Operation for SM-USB-DIG Platform
Figure 3 shows the block diagram for the SM-USB-DIG Platform. This platform is a general-purpose data-
acquisition system that is used on several different Texas Instruments evaluation modules. The details of
operation are included in
SBOU098 , SM-USB-DIG Platform User's Guide . The block diagram shown in
Figure 3 is given as a brief overview of the platform.
The primary component of the SM-USB-DIG Platform is the TUSB3210, an 8052 microcontroller that has
a built-in USB interface. The microcontroller receives information from the host computer that is
interpreted into power, I
2
C, SPI, and other digital I/O patterns. During the digital I/O transaction, the
microcontroller reads the response of any device connected to the I/O interface. The response from the
device is then sent back to the computer where it is interpreted by the host computer.
Figure 3. USB-DIG Platform Block Diagram
5 SBAU229 – April 2014 DACx760EMC-EVM
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