SP486ET-L Allicdata Electronics
Allicdata Part #:

1016-1522-5-ND

Manufacturer Part#:

SP486ET-L

Price: $ 0.00
Product Category:

Integrated Circuits (ICs)

Manufacturer: MaxLinear, Inc.
Short Description: IC DVR RS485/RS422 QUAD 16SOIC
More Detail: 4/0 Driver RS422, RS485 16-SOIC
DataSheet: SP486ET-L datasheetSP486ET-L Datasheet/PDF
Quantity: 1000
1 +: 0.00000
Stock 1000Can Ship Immediately
$ 0
Specifications
Series: --
Packaging: Tube 
Part Status: Obsolete
Type: Driver
Protocol: RS422, RS485
Number of Drivers/Receivers: 4/0
Duplex: --
Data Rate: 10Mbps
Voltage - Supply: 4.75 V ~ 5.25 V
Operating Temperature: -40°C ~ 85°C
Mounting Type: Surface Mount
Package / Case: 16-SOIC (0.295", 7.50mm Width)
Supplier Device Package: 16-SOIC
Description

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SP486ET-L Application Field and Working Principle

The SP486ET-L is an 8-pin through-hole Universal Synchronous/Asynchronous Receiver/Transmitter (USART) that is useful for interfacing a variety of peripheral devices in a microcontroller based system. Common application fields for this device are communication between two microcontrollers, data transmission from a modem to a host processor, and the interfacing of sensor and actuator I/O devices to a microcontroller. It can be seen as an ideal device for serial data communication. The SP486ET-L is determined by two operation modes, that is, synchronous and asynchronous transferring methods.

Synchronous Transferring Mode

Synchronous communication requests two devices to exchange data at constant rate and the data are transferred in a word format. A word may include several start-bit, data-bits and stop-bit in sequence. As it features with precise timing, the synchronous transferring mode is much more suitable for data communication over long-distance. The SP486ET-L utilizes the Manchester method to encode and decode information, which increases data accuracy and asynchronous clock synchronization.

Asynchronous Transferring Mode

By contrast, asynchronous communication allows two devices to exchange data in a non-continuous way. Every data unit sent by one device must include start and stop bits, in order to let the receiver determine the exact position of byte start and byte end. And the SP486ET-L supports both Asynchronous and Synchronous communication modes. Each byte will be encoded and sent out as a series of 1s and 0s, indicating the logic level.

Operation Modes

The SP486ET-L provides three different working modes to suite different applications. It is through the setting of RCS (Receiver Clock Select) and TCS (Transmitter Clock Select) pins that the actual working mode of SP486ET-L is determined. It is worth noting that the data sheet states that SP486ET-L does not support mode 0, so the three working modes are: Mode 1, Mode 2, and Mode 3.

  • Mode 1: It is for the synchronous operation and data flow is initiated by both data transition and the falling edge of RTS (Request To Send) pulses from the transmitting device. It supports only a single direction data flow with the receiver clock generated internally, which is triggered by the falling edge of RTS.
  • Mode 2: It is used when data communications need not necessarily be synchronized, as it allows bidirectional data transfer with no synchronization between transmitter and receiver. The word generation and transmission is completely initiated by the transition at the data lines.
  • Mode 3: It is suitable for applications in which bidirectional communications needs to take place with the sender and receiver clocks synchronized and the valid data character followed by the synchronization pulse.

Initializing the SP486ET-L

Before putting the SP486ET-L into operation, it is necessary to set up some registers to define the certain parameters of operation. There are two main registers for configuration, namely Mode Register and Baud Rate Register. To initialize them, the microcontroller enables the write strobe for the control register first, the data of control register is sent on DIN (Data Input) lines and all eight pins are then put into a low state at the same time. The content of the mode register, which is 9 bits, defines the character bit length, the stop bit number, the interrupt and the parity bit, while the Baud Rate Register defines the required baud rate.

Conclusion

The SP486ET-L works at a wide range of baud rate since it forms the receiver and transmitter clocks by discrete resistors connected to RCS and TCS pins. As the device is low-power CMOS circuitry, it is suitable for the design of battery-powered systems. Low cost, high speed and robust features make the SP486ET-L a perfect device for RS-232 compatible data transmissions.

The specific data is subject to PDF, and the above content is for reference

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