The model "ST485BDR" belongs to STMicroelectronics, which is a semiconductor company that produces a wide range of integrated circuits and electronic components. The ST485BDR is specifically a low- Power differential transceiver that supports RS-485 communication standards.
Here’s a breakdown of what you’ve requested:
Package Type:
ST485BDR is typically offered in a SOIC-8 (Small Outline Integrated Circuit) package, but it’s important to verify the specific package type in the datasheet if necessary. The number of pins is 8 in the SOIC-8 package.Pin Function Specifications:
For an 8-pin SOIC-8 package, here's a detailed explanation of the pins and their functions.
Pin Number Pin Name Pin Function Description 1 A Differential data input/output. 2 B Differential data input/output. 3 RE Receiver Enable. Controls the enablement of the receiver circuitry. Active low. 4 DE Driver Enable. Controls the enablement of the driver circuitry. Active high. 5 GND Ground pin. 6 VCC Power supply pin (typically 5V). 7 RO Receiver Output. The output of the receiver circuit (logic level signal). 8 T/R Transmitter/Receiver Control. Selects between transmit and receive modes.FAQ: 20 Common Questions about the ST485BDR
Q1: What is the operating voltage range for the ST485BDR? A1: The ST485BDR operates within a voltage range of 4.5V to 5.5V.
Q2: How many pins does the ST485BDR have? A2: The ST485BDR has 8 pins in its SOIC-8 package.
Q3: What type of communication does the ST485BDR support? A3: The ST485BDR supports RS-485 differential communication.
Q4: Can the ST485BDR be used in half-duplex communication? A4: Yes, the ST485BDR can be used for both half-duplex and full-duplex communication.
Q5: What is the maximum data rate supported by the ST485BDR? A5: The maximum data rate supported by the ST485BDR is 10 Mbps.
Q6: What is the purpose of the RE pin? A6: The RE pin is used to enable or disable the receiver. It is active low.
Q7: What happens when the DE pin is high? A7: When the DE pin is high, the driver is enabled, and the device is capable of transmitting data.
Q8: Is the ST485BDR a low-power device? A8: Yes, the ST485BDR is designed for low power consumption.
Q9: How does the ST485BDR handle signal line protection? A9: The ST485BDR is designed with built-in protection against ESD and over-voltage conditions.
Q10: What is the maximum output drive current for the ST485BDR? A10: The maximum output drive current is 250mA.
Q11: Can the ST485BDR interface with 3.3V logic systems? A11: Yes, the ST485BDR is compatible with 3.3V logic systems as well as 5V systems.
Q12: What is the significance of the T/R pin? A12: The T/R pin is used to switch between transmitter and receiver modes.
Q13: How should the A and B pins be connected? A13: The A and B pins should be connected to the differential data bus. A is typically the positive, and B is the negative data line.
Q14: What is the recommended operating temperature range for the ST485BDR? A14: The recommended operating temperature range is from -40°C to +85°C.
Q15: How can I reduce the power consumption of the ST485BDR? A15: To reduce power consumption, you can disable the receiver and driver when not in use by controlling the RE and DE pins.
Q16: Does the ST485BDR support fail-safe receivers? A16: Yes, the ST485BDR includes fail-safe features that handle the absence of a signal.
Q17: Can the ST485BDR be used in multi-point networks? A17: Yes, the ST485BDR is designed to work in multi-point RS-485 networks, allowing multiple devices to communicate on the same bus.
Q18: What is the maximum cable length for RS-485 communication with the ST485BDR? A18: The maximum cable length for reliable RS-485 communication depends on the data rate, but generally, it can reach up to 1200 meters (1.2 km) at lower speeds.
Q19: Is the ST485BDR used for long-distance communication? A19: Yes, RS-485 transceivers like the ST485BDR are designed for long-distance communication, supporting distances up to 1200 meters.
Q20: Can the ST485BDR be used in automotive applications? A20: Yes, the ST485BDR can be used in automotive applications, but you must check the specific automotive-grade requirements for environmental conditions.