TUSB32108052
Microcontroller
with USB Interface
and UART
USB Bus
from Computer
3.3-V
Regulator
+3.3 V
USB
+5.0 V
8-K 8-Byte
EEPROM
´
Buffers and
Level
Translators
Power
Switching
Vdut
(Hi-Z, 3.3V or 5V)
Switched Power
I C
SPI
Control Bits
Measure Bits
2
Power-On
Reset
SM-USB-DIG
To Test Board
To Computer
and Power Supplies
+3.3 V
USB +5.0 V
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INA230EVM Hardware Setup
2.2 Signal Definitions of H1 (10-Pin Male Connector Socket)
Table 3 lists the pinout for the 10-pin connector socket used to communicate between the INA230EVM
and the SM-USB-DIG. It should be noted that the INA230EVM only uses the necessary I
2
C
communication lines (pins 1 and 3) and the V
DUT
and GND pins (pin 6 and pin 8) to issue commands to
the INA230 chip.
Table 3. Signal Definition of J1 on INA230EVM Board
Pin on J1 Signal Description
1 I2C_SCL I
2
C Clock Signal (SCL)
2 CTRL/MEAS4 GPIO: Control Output or Measure
Input
3 I2C_SDA1 I
2
C Data Signal (SDA)
4 CTRL/MEAS5 GPIO: Control Output or Measure
Input
5 SPI_DOUT1 SPI Data Output (MOSI)
6 V
DUT
Switchable DUT Power Supply: +3.3
V, +5 V, Hi-Z (Disconnected)
(1)
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)
(1)
When V
DUT
is Hi-Z, all digital I/O are Hi-Z as well.
2.2.1 Theory of Operation for SM-USB-DIG Platform
Figure 4 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
its operation are included in a separate document, SBOU098 (available for download at www.ti.com). The
block diagram shown in Figure 4 gives a brief overview of the platform. The primary control device on the
SM-USB-DIG Platform is the TUSB3210. The TUSB3210 is an 8052 microcontroller that has an onboard
USB interface. The microcontroller receives information from the host computer that it interprets 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 sent back to
the PC where it is interpreted by the host computer.
Figure 4. SM-USB-DIG Platform Block Diagram
5
SBOU124–March 2012 INA230EVM Evaluation Board and Software Tutorial
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Copyright © 2012, Texas Instruments Incorporated
