The MAX13487EESA+T is a product from Analog Devices (formerly Maxim Integrated). It is a RS-485 transceiver designed to facilitate communication in differential data transmission systems. Below, I will provide detailed information about the device, including its pin functions, packaging, circuit principles, and frequently asked questions (FAQs).
1. Package and Pinout Details:
The MAX13487EESA+T comes in a SOIC-8 (Small Outline Integrated Circuit) package, which contains 8 pins. It is a half-duplex RS-485 transceiver with features like high data rates and low Power consumption.
Here is the breakdown of the 8 pins of the MAX13487EESA+T:
Pin Number Pin Name Pin Function Description 1 RO (Receiver Output) This pin provides the output of the receiver circuit. It carries the differential signal from the bus, converted to a single-ended signal. 2 RE (Receiver Enable) This is an active-low pin used to enable the receiver. When RE is low, the receiver is active, and when high, the receiver is disabled. 3 DE (Driver Enable) This is an active-high pin used to enable the driver. When DE is high, the driver is active, and when low, the driver is disabled. 4 DI (Driver Input) This is the input for the driver. It receives data from a microcontroller or other digital device to drive the bus in differential form. 5 A (Differential Input/Output) This is the positive differential bus line used for RS-485 communication. It carries the differential signal in a bidirectional manner. 6 B (Differential Input/Output) This is the negative differential bus line, working in opposition to pin A to form the differential pair for data transmission. 7 Vcc (Power Supply) This pin supplies the power to the transceiver. It typically operates within a voltage range of 3V to 5.5V. 8 GND (Ground) This pin is the ground reference for the device. It should be connected to the common ground in the system.2. Circuit Principle Explanation:
The MAX13487EESA+T is based on the RS-485 differential bus standard, commonly used for long-distance, high-speed data communication. It provides both transmit (driver) and receive (receiver) functionalities, allowing the device to send and receive differential signals over the bus.
Driver Section: The driver section (pins 3 and 4) converts the single-ended data input (from a microcontroller, for example) into a differential signal that is sent across the bus. When the DE (Driver Enable) pin is high, the driver transmits data to the bus. The DI pin is used to input data to the driver. Receiver Section: The receiver section (pins 1 and 2) is used to convert the differential signals on the bus back into single-ended signals that are output to the receiving device. The RE (Receiver Enable) pin must be low to enable the receiver.The differential signaling (pins A and B) allows for greater immunity to noise and ensures reliable communication over long distances (up to 4000 feet). This transceiver is capable of both half-duplex and multi-point communication on an RS-485 bus.
3. Common FAQ for MAX13487EESA+T:
Here are 20 frequently asked questions about the MAX13487EESA+T transceiver:
What is the MAX13487EESA+T? The MAX13487EESA+T is an RS-485 transceiver designed for half-duplex communication on differential data transmission systems.
How many pins does the MAX13487EESA+T have? The MAX13487EESA+T has a total of 8 pins.
What is the function of pin RO (Receiver Output)? Pin RO outputs the receiver's converted single-ended signal from the differential data on the RS-485 bus.
What does pin RE (Receiver Enable) do? Pin RE is used to enable or disable the receiver. It is an active-low pin, meaning the receiver is active when RE is low.
What is the function of pin DE (Driver Enable)? Pin DE is used to enable or disable the driver. It is an active-high pin, meaning the driver is active when DE is high.
What is the role of pin DI (Driver Input)? Pin DI receives data to be transmitted on the RS-485 bus. It is the input for the driver section.
What are pins A and B used for? Pins A and B are the differential pair used to carry data on the RS-485 bus. Pin A is the positive differential line, and pin B is the negative differential line.
What supply voltage is needed for the MAX13487EESA+T? The MAX13487EESA+T requires a supply voltage between 3V and 5.5V.
How do I interface the MAX13487EESA+T with a microcontroller? Connect the DI pin to the microcontroller's data output pin, and the RO pin to the microcontroller's data input pin. Use the DE and RE pins to enable the driver and receiver as needed.
Can I use the MAX13487EESA+T for full-duplex communication? No, the MAX13487EESA+T is designed for half-duplex communication only.
How long can the RS-485 bus be? The RS-485 bus can be up to 4000 feet (1200 meters), depending on the data rate and cable quality.
What is the data rate supported by the MAX13487EESA+T? The MAX13487EESA+T supports data rates up to 10 Mbps.
How do I terminate the RS-485 bus properly? Use a 120-ohm resistor at each end of the bus to prevent reflections and ensure proper signal integrity.
What is the maximum number of devices I can connect to the bus? The RS-485 standard allows for up to 32 devices on the same bus.
Is the MAX13487EESA+T suitable for noisy environments? Yes, RS-485 differential signaling provides excellent noise immunity, making the MAX13487EESA+T suitable for noisy environments.
Can the MAX13487EESA+T drive long distances? Yes, the MAX13487EESA+T can drive signals over long distances, up to 4000 feet.
What is the power consumption of the MAX13487EESA+T? The MAX13487EESA+T is designed for low power consumption, with typically 10mA during operation.
What happens if RE and DE are both high? If both RE and DE are high, the device is in an invalid state, and the driver and receiver may be enabled simultaneously, causing signal conflicts.
How should I connect the MAX13487EESA+T to power? Connect the Vcc pin to the positive supply voltage and the GND pin to the system ground.
What is the temperature range of the MAX13487EESA+T? The operating temperature range of the MAX13487EESA+T is typically from -40°C to +85°C.
This explanation includes detailed information on the MAX13487EESA+T, its pin functions, and common FAQs, formatted in an organized and comprehensive manner. If you need additional information, feel free to ask!
