Datasheet

H1
10-Pin SM-DIG Connector
INA223
Supply Voltage
I2C Interface
T2
Shunt
Terminal
2
JMP1/JMP2
I2C Addr
Jumper
A0
Vs Vdut
www.ti.com INA223EVM Hardware Setup
2.1 Theory of Operation for INA223 Hardware
A block diagram of the INA223 test-board hardware setup is shown in Figure 3. The PCB provides
connections to the I
2
C™ and general-purpose inputs and outputs (GPIO) on the SM-USB-DIG Platform
board. It also provides connection points for external connections to the shunt voltage.
Figure 3. INA223 Test Board Block Diagram
2.2 Signal Definitions of H1 (10-Pin Male Connector Socket)
Table 2 shows the pinout for the 10-pin connector socket used to communicate between the INA223EVM
and the SM-USB-DIG. It should be noted that to issue commands to the INA223 chip, the INA223EVM
only uses H1 connnector pins 1 and 3 (I
2
C communication lines), pin 6 (VDUT), and pin 8 (GND).
Table 2. INA223EVM H1 Pin Connections
Pin on H1 Signal Description
1 I2C_SCL I
2
C clock signal (SCL)
2 CTRL/MEAS4
(1)
GPIO—Control output or measure input
3 I2C_SDA1 I
2
C data signal (SDA)
4 CTRL/MEAS5
(1)
GPIO—Control output or measure input
5 SPI_DOUT3
(1)
SPI™ data output (MOSI)
6 VDUT Switchable DUT power supply: +3.3V, +5V, Hi-Z
(disconnected).
(2)
7 SPI_CLK
(1)
SPI clock signal (SCLK)
8 GND Power return (GND)
9 SPI_CS1
(1)
SPI chip select signal (CS)
10 SPI_DIN1
(1)
SPI data input (MISO)
(1)
This signal is not used on the INA223EVM.
(2)
When VDUT is Hi-Z, all digital inputs and outputs (I/O) are Hi-Z as well.
5
SBOU125–June 2012 INA223EVM User’s Guide and Software Tutorial
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