ADM3251EARWZ-REEL Detailed explanation of pin function specifications and circuit principle instructions

The part number you provided, " ADM3251EARWZ -REEL," refers to a component from Analog Devices (brand). This specific part is part of their series of RS-232 transceiver s, commonly used for communication between microcontrollers and other digital systems.

Packaging:

Package Type: TSSOP-28 (Thin Shrink Small Outline Package with 28 pins).

Pinout and Functions for ADM3251EARWZ-REEL:

The ADM3251EARWZ-REEL is a 28-pin device. Below is the pinout and corresponding pin functions in table format:

Pin Number Pin Name Pin Function Description 1 GND Ground pin, used to establish the reference ground for the circuit. 2 VCC Power supply pin, connected to the positive voltage supply (typically 3.3V or 5V). 3 NC No connection. This pin is not connected internally and has no function. 4 RO Receiver output (logic level output) for RS-232 data. 5 RI Ring indicator, used to signal the presence of an incoming call in certain applications (RS-232). 6 DTR Data Terminal ready, used for flow control between the data terminal equipment and the data communication equipment. 7 DSR Data set ready, used to indicate that the data set is ready to establish communication. 8 TXD Transmit data, logic level output for RS-232 data to be transmitted to the device. 9 CTS Clear to send, used in hardware handshaking to signal that the device can send data. 10 RTS Request to send, used for flow control to request permission to send data to the communication partner. 11 VCC Power supply pin. 12 DCD Data carrier detect, used to detect if a carrier signal is present on the communication line (used in modems). 13 NC No connection. 14 RO Receiver output (RS-232 logic level output). 15 R1 Receiver input for signal R1 in multi-drop configuration. 16 R2 Receiver input for signal R2. 17 R3 Receiver input for signal R3. 18 T1 Transmitter output for signal T1. 19 T2 Transmitter output for signal T2. 20 T3 Transmitter output for signal T3. 21 T4 Transmitter output for signal T4. 22 TXD Transmit data signal for logic level data transmission. 23 RXD Receive data, logic level input for receiving RS-232 data from a connected device. 24 RI Ring indicator pin for signaling when there is an incoming call. 25 DTR Data terminal ready, used to manage handshaking between communicating devices. 26 CTS Clear to send, used to indicate when the line is ready to receive data. 27 RTS Request to send, used to request permission to transmit data. 28 GND Ground pin, ensures proper signal reference for all other pins.

20 FAQ about ADM3251EARWZ-REEL:

What is the package type of the ADM3251EARWZ-REEL? The ADM3251EARWZ-REEL is packaged in a 28-pin TSSOP (Thin Shrink Small Outline Package). What is the function of the GND pin? The GND pin serves as the ground reference for the device, ensuring proper voltage levels. How should the VCC pin be connected? The VCC pin should be connected to the positive voltage supply (3.3V or 5V depending on the application). What does the RO pin do? The RO pin is the Receiver Output, providing the logic level output for received RS-232 data. What is the purpose of the RI pin? The Ring Indicator (RI) pin signals an incoming call in communication systems like modems. What is the DTR pin used for? The DTR (Data Terminal Ready) pin is used for flow control between devices. How does the DSR pin function? The DSR (Data Set Ready) pin indicates that the data set is ready to establish communication. What is the TXD pin used for? The TXD pin transmits data from the device, providing a logic level output for RS-232 communication. What does the CTS pin indicate? The CTS (Clear to Send) pin is used to indicate that the device is ready to send data, part of flow control.

What is the function of the RTS pin?

The RTS (Request to Send) pin requests permission from the receiving device to send data.

Why is the VCC pin important?

The VCC pin provides the required power for the operation of the device.

What is the role of the DCD pin?

The DCD (Data Carrier Detect) pin is used to detect if a carrier signal is present, typically in modem applications.

What happens if the NC pin is connected?

The NC (No Connection) pin should not be connected to anything and has no electrical function.

What are the T1, T2, T3, T4 pins used for?

The T1, T2, T3, and T4 pins are used for transmitting data in multi-drop configurations.

Can the RO pin be used for sending data?

No, the RO pin is used for receiving data, not for sending.

What voltage should the VCC pin be connected to?

The VCC pin should typically be connected to a voltage supply of 3.3V or 5V, depending on the circuit's requirement.

What should be done if the DTR or RTS pins are not used?

If the DTR or RTS pins are not needed, they can be left unconnected or tied to the ground.

What is the function of the RXD pin?

The RXD pin is used to receive data from a connected device, providing a logic level input for RS-232 communication.

Is the ADM3251EARWZ-REEL suitable for high-speed data transfer?

Yes, the ADM3251EARWZ-REEL supports high-speed RS-232 data communication.

What should I do if the ring indicator (RI) pin is not used?

If the RI pin is not used, it can be left unconnected or tied to ground.

This detailed overview includes pin functions, packaging, and a comprehensive FAQ section. Let me know if you'd like to explore further!