Datasheet

INA3221
V Supply
(DVDD)
DUT
I C Interface
2
10-Pin Female
SM-USB-DIG
Connector
J5/J6
J3/J4
J1
Shunt Terminals
T3/T4
4
I C Address
Jumpers
2
A0
A1
www.ti.com INA3221EVM Hardware Setup
2.1 INA3221 Hardware Theory of Operation
A block diagram of the INA3221 test board hardware setup is shown in Figure 3. PCB functionality
provides connections to the I
2
C interface and general-purpose inputs/outputs (GPIOs) on the SM-USB-
DIG platform board. The PCB also provides connection points for external shunt voltage, bus voltage, and
ground connections.
Figure 3. INA3221EVM Test Board Block Diagram
2.2 H1 Signal Definitions (10-Pin Male Connector Socket)
Table 3 lists the pinout for the 10-pin connector socket used to communicate between the INA3221EVM
and the SM-USB-DIG. It should be noted that the INA3221EVM 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 INA3221 chip.
Table 3. Pin Connections
Pin on U1 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 VDUT 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 VDUT is Hi-Z, all digital I/O are Hi-Z as well.
5
SBOU126–April 2012 INA3221EVM Evaluation Board and Software Tutorial
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