The MAX13487EESA+T is a product from Maxim Integrated (now part of Analog Devices). It is a RS-485/RS-422 transceiver . I'll give a detailed explanation of the pin functions, packaging details, and circuit principles as requested, including all the pins' functionality.
Here’s a breakdown based on the MAX13487EESA+T:
1. Package Information:
Package Type: SOIC (Small Outline Integrated Circuit) Number of Pins: 8 pins (for the MAX13487EESA+T model specifically)2. Pinout Table:
Pin # Pin Name Description 1 RO Receiver Output. This pin outputs the received data on the bus when the receiver is enabled. 2 RE* Receiver Enable (active low). When RE* is low, the receiver is enabled, and data can be received. When high, the receiver is disabled, and the output (RO) is in high-impedance mode. 3 DE Driver Enable. When DE is high, the driver is enabled, and the data on the bus is transmitted. When low, the driver is disabled, and the bus is in high-impedance mode. 4 DI Driver Input. This pin receives the data to be transmitted to the bus when the driver is enabled. 5 A Bus A (Differential). This is the non-inverting side of the differential data transmission. 6 B Bus B (Differential). This is the inverting side of the differential data transmission. 7 Vcc Power supply pin (typically +3.3V to +5V depending on the operating voltage). 8 GND Ground. This pin is connected to the system ground.3. Circuit Principle:
RS-485 Transceivers are used for differential data transmission. They are commonly used in industrial and communication systems because they allow long-distance communication with noise immunity. The MAX13487EESA+T is a half-duplex transceiver for the RS-485/RS-422 protocols.
The RE* and DE pins control the direction of data flow. When RE* is low, the device is in receive mode, and when DE is high, the device is in transmit mode. DI and RO are the pins for data input and output, respectively.
The differential signaling on A and B ensures that the transceiver can work in electrically noisy environments, which is why the RS-485 standard is often used in industrial communication.
4. FAQ for MAX13487EESA+T:
**Q1: What is the function of the *RE** pin in the MAX13487EESA+T?** A1: The RE* pin is the receiver enable pin. When it is low, the receiver is enabled, and data can be received. When it is high, the receiver is disabled, and the output (RO) is in a high-impedance state.
**Q2: What does the *DE* pin control in the MAX13487EESA+T?** A2: The DE pin is the driver enable pin. When it is high, the driver is enabled, and data is transmitted to the bus. When low, the driver is disabled, and the bus is in high-impedance mode.
**Q3: What is the difference between the *A* and B pins?** A3: A is the non-inverting pin, while B is the inverting pin in the differential transmission system. These pins carry the complementary signals for the RS-485 standard.
Q4: Can the MAX13487EESA+T be used for full-duplex communication? A4: No, the MAX13487EESA+T is a half-duplex transceiver, meaning it can either transmit or receive at a time, but not both simultaneously.
Q5: What are the typical voltage levels required for the MAX13487EESA+T? A5: The device typically operates at a voltage range of 3.3V to 5V, with 5V being the most common supply voltage for RS-485 systems.
Q6: How does the MAX13487EESA+T achieve noise immunity? A6: The MAX13487EESA+T uses differential signaling, where the voltage difference between the A and B pins is used to transmit data. This method is resistant to common-mode noise because the receiver measures the difference between the two lines, not the absolute voltage.
Q7: What is the maximum data rate for the MAX13487EESA+T? A7: The MAX13487EESA+T can achieve data rates up to 2.5 Mbps, which is typical for RS-485 communication systems.
Q8: What type of communication systems is the MAX13487EESA+T used in? A8: It is used in industrial automation, automotive communication, data acquisition systems, and other systems that require robust, long-distance communication over twisted-pair cables.
Q9: Is the MAX13487EESA+T suitable for point-to-point communication? A9: The MAX13487EESA+T is designed for multipoint communication, typically up to 32 devices on a single bus. Point-to-point communication can still be used, but it's not the main use case.
Q10: How does the MAX13487EESA+T prevent data collisions? A10: The device uses differential signaling and, in multi-device setups, typically relies on driver enable (DE) and receiver enable (RE*) pins to control when each device is transmitting or receiving.
Q11: Can I use the MAX13487EESA+T for both 485 and 422 standards? A11: Yes, the MAX13487EESA+T supports both RS-485 and RS-422 standards, making it versatile for different communication needs.
Q12: Can the MAX13487EESA+T be used in low-power applications? A12: The MAX13487EESA+T consumes low power during operation, but for ultra-low power applications, it may be necessary to choose a transceiver specifically designed for low-power modes.
Q13: What is the maximum operating temperature range for the MAX13487EESA+T? A13: The operating temperature range for the MAX13487EESA+T is from -40°C to +85°C, suitable for industrial environments.
Q14: Can the MAX13487EESA+T be used for long-distance communication? A14: Yes, RS-485 is designed for long-distance communication, and the MAX13487EESA+T supports communication over distances of up to 4000 feet (1200 meters) at 100 kbps.
Q15: How does the MAX13487EESA+T compare to the MAX13487EESA in terms of functionality? A15: The MAX13487EESA+T is a specific version with a higher temperature range and improved characteristics for certain applications compared to the base model.
Q16: Can I use the MAX13487EESA+T in a 5V system? A16: Yes, the MAX13487EESA+T is compatible with 5V systems and operates within the 3.3V to 5V voltage range.
**Q17: What is the importance of the high-impedance state of the *RO* pin when the receiver is disabled?** A17: The high-impedance state of RO allows the bus to remain unaffected by the transceiver when it is not receiving data, ensuring that other devices can use the bus without interference.
Q18: Does the MAX13487EESA+T support bidirectional communication? A18: The MAX13487EESA+T does not support full-duplex communication, but it supports half-duplex operation, meaning it can send or receive data, but not both at the same time.
Q19: How do I terminate the RS-485 bus? A19: To terminate the RS-485 bus properly, use a termination resistor (typically 120Ω) at each end of the bus to prevent signal reflections.
**Q20: What is the role of the *Vcc* and GND pins in the MAX13487EESA+T?** A20: The Vcc pin is the power supply input for the device, typically +3.3V to +5V, while the GND pin is the ground reference for the circuit.
This summary should be detailed enough for your needs, covering the most important information regarding the MAX13487EESA+T and its pin functions. Let me know if you need further clarification or additional details!
