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OSTTE030161 Datasheet(PDF) 10 Page - Texas Instruments |
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OSTTE030161 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 26 page INA223EVM Hardware Overview www.ti.com 3.6 INA223EVM Hardware This section describes some of the hardware features present on the INA223EVM board. 3.6.1 JMP3: I 2C versus Control Setting The JMP3 setting determines if the INA223 is powered from the SM-USB-DIG platform or an external power supply. If JMP3 is set to the INT position, the V S pin is connected to the switchable VDUT signal generated from the SM-USB-DIG Platform. This voltage can be set to either 3.3 V or 5 V, depending on how it is configured in the software. When JMP3 is set to the EXT position, an external supply connected to terminal T1 must be used to provide the digital supply voltage for the INA223. 3.6.2 JMP1 and JMP2: I 2C Address Hardware Setting (A0) JMP1 and JMP2 are used to set the hardware setting for the A0 I 2C address pin on the INA223. Using JMP2, the A0 address can be set to either a logic '1' or a logic '0'. Using JMP1, the A0 address can be set to either the SCL or SDA communication line. Make sure to only have a jumper installed on JMP1 or JMP2. Failure to keep these lines separate can lead to board shorts and problems with the I 2C communication lines. See the I2C Address Selection section for how to configure the INA223EVM software to match the JMP1 and JMP2 hardware settings. 3.6.3 External I 2C lines and Terminal Block T3 The I 2C communication lines on the INA223EVM are tied to two sources: The internal I2C communication lines from the SM-USB-DIG Platform and terminal block T3. If external signals separate from the SM-USB- DIG are to be used, simply disconnect the SM-USB-DIG from the INA223 board and connect to external SDA, SCL, and GND lines. Also, remember to apply an external V S that is compatible with the I 2C communication device being used. CAUTION Failure to disconnect the SM-USB-DIG Platform while using external I 2C communication can cause damage to the SM-USB-DIG or external communication device. 10 INA223EVM User’s Guide and Software Tutorial SBOU125 – June 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated |
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