Connectors and Communication interfaces-Pin Counts:

Here’s a list of pin counts for various commonly used connectors and communication interfaces:

1. JTAG (Joint Test Action Group)

JTAG pin count varies depending on the implementation, but the most common configurations are:

• 10-pin JTAG Connector:
  • Standard for ARM microcontrollers.
  • Pinout: TCK, TMS, TDI, TDO, GND, VCC, etc.
• 20-pin JTAG Connector:
  • Used in many development boards.
  • Includes additional pins for power, ground, and optional features.
• 14-pin JTAG Connector (TI DSPs):
  • Used by Texas Instruments DSPs.

2. SPI (Serial Peripheral Interface)

• Standard Pin Count: 4 pins (minimum)
  • SCLK: Serial Clock
  • MOSI: Master Out, Slave In
  • MISO: Master In, Slave Out
  • SS/CS: Slave Select/Chip Select
• Additional pins may be added for multiple devices (e.g., extra CS pins).

3. I²C (Inter-Integrated Circuit)

• Standard Pin Count: 2 pins
  • SCL: Serial Clock Line
  • SDA: Serial Data Line
• Optional pins:
  • VCC and GND (commonly used in pull-up resistor circuits).

4. Ethernet/IP

• Standard RJ45 Connector: 8 pins
  • Pins 1-2: Transmit Data (TX+ and TX−)
  • Pins 3-6: Receive Data (RX+ and RX−)
  • Pins 4-5, 7-8: Used for PoE (Power over Ethernet) or not used in 10/100 Mbps.
  • In Gigabit Ethernet, all 8 pins are used.

5. Serial Port

• RS-232 (DB9 Connector): 9 pins
  • Standard pinout includes TX, RX, GND, DTR, RTS, CTS, DSR, RI, and CD.
• RS-232 (DB25 Connector): 25 pins
  • Includes additional control signals but is less common today.
• RS-485: Typically uses 2 pins for differential signaling (A and B) and 1 pin for ground.

6. USB

• USB 2.0 Standard: 4 pins
  • VBUS: Power (5V)
  • D+ and D−: Differential Data Lines
  • GND: Ground
• USB 3.0/3.1: 9 pins
  • Includes additional pins for SuperSpeed data transfer.

7. CAN (Controller Area Network)

• Standard Pin Count: 2 pins
  • CAN_H: High Line
  • CAN_L: Low Line
• Optional:
  • Ground and Shield for noise reduction.

8. HDMI (High-Definition Multimedia Interface)

• Standard Pin Count: 19 pins
  • Includes pins for TMDS data, clock signals, power, and ground.

9. VGA (Video Graphics Array)

• Standard Pin Count: 15 pins
  • RGB signals, synchronization signals, and ground.

10. SATA (Serial ATA)

• Power Connector: 15 pins
• Data Connector: 7 pins

Summary Table