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TTL serial refers to single-ended serial communication using raw transistor voltage levels: "low" for 0 and "high" for 1. [31] UART over TTL serial is a common debug interface for embedded devices. Handheld devices such as graphing calculators and NMEA 0183 -compliant GPS receivers and fishfinders also commonly use UART with TTL.
Serial communication on pin D0 (RX) and pin D1 (TX). used to receive (RX) and transmit (TX) TTL serial data. These pins are connected to the corresponding pins of the FTDI USB-to-TTL serial chip. By sliding the switch (S1), RX/TX pins can be re-routed to Bluetooth UART connector. Linduino One ATmega328 Linear Technology Corporation [70]
Differential TTL is a type of binary electrical signaling based on the transistor-transistor logic (TTL) concept. It enables electronic systems to be relatively immune to noise. [ 1 ] RS-422 and RS-485 outputs can be implemented as differential TTL.
Some serial Arduino boards contain a level shifter circuit to convert between RS-232 logic levels and transistor–transistor logic level signals. Current Arduino boards are programmed via Universal Serial Bus (USB), implemented using USB-to-serial adapter chips such as the FTDI FT232.
In TTL logic, bipolar junction transistors (BJTs) perform the logic and amplifying functions. The first transistor–transistor logic family of integrated circuits was introduced by Sylvania as Sylvania Universal High–Level Logic (SUHL) in 1963. Texas Instruments introduced the 7400 series TTL family in 1964.
Current mode logic (CML), or source-coupled logic (SCL), is a digital design style used both for logic gates and for board-level digital signaling of digital data. The basic principle of CML is that current from a constant current generator is steered between two alternate paths depending on whether a logic zero or logic one is being represented.
Serial communication on pin D0 (RX) and pin D1 (TX). used to receive (RX) and transmit (TX) TTL serial data. These pins are connected to the corresponding pins of the FTDI USB-to-TTL Serial chip. By sliding the switch (S1), RX/TX pins can be re-routed to Bluetooth UART connector. Linduino One Linear Technology Corporation [60] Yes ATmega328 16 MHz
MAX232 chip in DIP-16 package The die of a MAX232 MAX232 pinout: Red: power, Yellow: charge pump capacitors, Blue: outputs, Green: inputs, Pins 9–12: TTL/CMOS I/O voltages. The MAX232 is an integrated circuit by Maxim Integrated Products, now a subsidiary of Analog Devices, that converts signals from a TIA-232 (RS-232) serial port to signals suitable for use in TTL-compatible digital logic ...