74HC05 - is socketed to allow the user to easily change a damaged device EEPROM Pin 1 - is usually the Address 0 (A0) address bit. This jumper allows the user to change the on-board EE address. EEPROM Pin 7 - is usually a Write Protect (WP) input and may be active either high or low. This jumper allows the user to put the WP pin in the correct state for writing. You can also place a device like the PCF8570 static RAM in the EEPROM socket and then tie this pin low. I2C EEPROM - is socketed to allow the user to use this hardware to program DIP EEPROMs. The EEPROM is a handy feature to verify the hardware/software are functioning correctly. Headers - there are two headers on the board with different pinning layouts to connect the LPT-to-I2C hardware to the user's target system. LED - is used to visually show there is power to the board. When SDA is high (idle) the LED is on while it is off when SDA is low. A flicker will be seen when there is traffic on the bus. Click here for a comparison between this product and RS-232 based products. Click here for our Product Selector Guide to help you with your purchase. |
DB-25
Connector -
plugs into the user's parallel port
