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INA3221-Q1 Datasheet(PDF) 19 Page - Texas Instruments

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Part # INA3221-Q1
Description  Current and Voltage Monitor with Programmable Overcurrent Alerts
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

INA3221-Q1 Datasheet(HTML) 19 Page - Texas Instruments

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Copyright © 2016, Texas Instruments Incorporated
8.5 Programming
8.5.1 Bus Overview
The INA3221-Q1 offers compatibility with both I2C and SMBus interfaces. The I2C and SMBus protocols are
essentially compatible with one another.
The I2C interface is used throughout this data sheet as the primary example, with the SMBus protocol specified
only when a difference between the two systems is discussed. Two I/O lines, the serial clock (SCL) and data
signal line (SDA), connect the INA3221-Q1 to the bus. Both SCL and SDA are open-drain connections.
The device that initiates a data transfer is called a master, and the devices controlled by the master are slaves.
The bus must be controlled by the master device that generates the SCL, controls the bus access, and
generates start and stop conditions.
To address a specific device, the master initiates a start condition by pulling SDA from a high to a low logic level
while SCL is high. All slaves on the bus shift in the slave address byte on the SCL rising edge, with the last bit
indicating whether a read or write operation is intended. During the ninth clock pulse, the slave being addressed
responds to the master by generating an acknowledge bit and pulling SDA low.
Data transfer is then initiated and eight bits of data are sent, followed by an acknowledge bit. During data
transfer, SDA must remain stable while SCL is high. Any change in SDA while SCL is high is interpreted as a
start or stop condition.
After all data are transferred, the master generates a stop condition by pulling SDA from low to high while SCL is
high. The INA3221-Q1 includes a 28-ms timeout on the interface to prevent locking up the bus. Serial Bus Address
To communicate with the INA3221-Q1, the master must first address slave devices with a slave address byte.
This byte consists of seven address bits and a direction bit to indicate whether the intended action is a read or
write operation.
The INA3221-Q1 has one address pin, A0. Table 1 describes the pin logic levels for each of the four possible
addresses. The state of the A0 pin is sampled on every bus communication and must be set before any activity
on the interface occurs.
Table 1. Address Pins and Slave Addresses
1000011 Serial Interface
The INA3221-Q1 only operates as a slave device on the I2C bus and SMBus. Bus connections are made using
the open-drain I/O lines, SDA and SCL. The SDA and SCL pins feature integrated spike-suppression filters and
Schmitt triggers to minimize the effects of input spikes and bus noise. While there is spike suppression integrated
into the digital I/O lines, use proper layout to minimize the amount of coupling into the communication lines.
Noise introduction occurs from capacitively coupling signal edges between the two communication lines
themselves, or from other switching noise sources present in the system. Routing traces in parallel with ground
between layers on a printed circuit board (PCB) typically reduces the effects of coupling between the
communication lines. Shield communication lines to reduce the possibility of unintended noise coupling into the
digital I/O lines that could be incorrectly interpreted as start or stop commands.
The INA3221-Q1 supports a transmission protocol for Fast (1 kHz to 400 kHz) and High-speed (1 kHz to 2.44
MHz) modes. All data bytes are transmitted MSB first.

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