I was expecting 6 pins for 3 GPOs. Got a bit confused when i counted 10
GPO pinout questions
GPO pinout questions
Could you give me a pinout for the low power GPOs on the MX6? I have seen Figure 10 in the manual (PK202-24-USB_140.pdf), but don't find it very clear. Half the pins are 5v, there is a NC and a ground, but then there are 3 pins labled GPO 4, 5 and 6. Are these pins just the ground for the 3 different GPOs?
I was expecting 6 pins for 3 GPOs. Got a bit confused when i counted 10
I was expecting 6 pins for 3 GPOs. Got a bit confused when i counted 10
Hi DuckUK,
The bottom sections labled GPO 4,5 and 6, are the negative terminals of the board. They aren't ground connections though. The side labeled GPO 4,5, and 6 go to the microcontroller. Say you were connecting an led to the gpo, the anode(positive section of the led) will connect to the +5V side, and the cathode(negative section of led) will connect to the desired GPO number. The extra +5V and ground pins are for a constant 5V for whatever you want to do with it. The NC just means no connection, so that pin has no use.
I hope this clears things up for you. If you have anymore questions or concerns, please feel free to post.
Best Regards,
The bottom sections labled GPO 4,5 and 6, are the negative terminals of the board. They aren't ground connections though. The side labeled GPO 4,5, and 6 go to the microcontroller. Say you were connecting an led to the gpo, the anode(positive section of the led) will connect to the +5V side, and the cathode(negative section of led) will connect to the desired GPO number. The extra +5V and ground pins are for a constant 5V for whatever you want to do with it. The NC just means no connection, so that pin has no use.
I hope this clears things up for you. If you have anymore questions or concerns, please feel free to post.
Best Regards,
Thanks for the quick reply.
Does each 5v line have a current limiting resistor to stop it going above 20mA? So would i be able to attach 10 LEDs (red ones rated at 2.5v 20mA). 2 LEDs in series to each of the 5 5v pins? 3 of the pairs will be able to be controled on and off from LCDC. Is that right?
But the PD accross a GPO is 5v? Which means the GPO 4, 5 and 6 pins are effectively 0v?Tom wrote:The bottom sections labled GPO 4,5 and 6, are the negative terminals of the board.
Does each 5v line have a current limiting resistor to stop it going above 20mA? So would i be able to attach 10 LEDs (red ones rated at 2.5v 20mA). 2 LEDs in series to each of the 5 5v pins? 3 of the pairs will be able to be controled on and off from LCDC. Is that right?
DuckUK,
When the gpo is off, the pins labled GPO 4,5, and 6 voltages are not effectively 0V . The actual GPO, 4,5, and 6 labeled side is at 5V because of a weak internal pull up resistor inside the controller. Once we turn on the gpo, the port is set to 0V, and current will flow from the 5V source through the led to ground, which is the output port set to 0V. You can say the the pins labeled GPO 4,5, and 6 are 0V when the GPO is on then.
The GPOs use 240ohm resistor to limit the current to 20mA. You will be able to put to 2-2.5V 20mA leds in series with each pin. Each pair will be controlled by LCDC, but you can't control one led independantly from the same pin. Both leds connected to the same pin will behave the same way.
I hope this explaination clears things up for you. If you have anymore questions or concerns, please feel free to contact me.
Best Regards,
When the gpo is off, the pins labled GPO 4,5, and 6 voltages are not effectively 0V . The actual GPO, 4,5, and 6 labeled side is at 5V because of a weak internal pull up resistor inside the controller. Once we turn on the gpo, the port is set to 0V, and current will flow from the 5V source through the led to ground, which is the output port set to 0V. You can say the the pins labeled GPO 4,5, and 6 are 0V when the GPO is on then.
The GPOs use 240ohm resistor to limit the current to 20mA. You will be able to put to 2-2.5V 20mA leds in series with each pin. Each pair will be controlled by LCDC, but you can't control one led independantly from the same pin. Both leds connected to the same pin will behave the same way.
I hope this explaination clears things up for you. If you have anymore questions or concerns, please feel free to contact me.
Best Regards,