urjaman
"I Know. We're going for a ride."
Hello to all,
First i want to say that I'm just playing with the idea and I'm more like asking for this - essentially asking how many would like this and if somebody (maybe even OP?) would like to kit&sell or something.
So to the idea. The pandora has an EXT connector with 2 UARTS (if i remember correctly the 4-pin (with RTS/CTS) uart pins can also be used as GPIO, can the first too? (if so, 6 GPIO's)) with logic levels of 1.8V and a 2.8V 200 mA power supply. I'm assuming that a 3.3V or 5V supply and logic level conversion (to 3.3 or 5V) would be useful for a lot of people thinking of attaching their own electronics/µC's/whatever to the pandora.
So a simple chip list for my idea:
- 1*1.8V regulator
- 1*MAX756 3.3/5V boost converter
- 2*TXB0104 level converter
It would need some other stuff too, but skipping the listing for now (capacitors, diode, etc)
It's a bit sub-optimal to have 2 TXB0104's for 6 I/O lines (they provide 2*4=8), so if anyone has a better idea, just tell.
So, essentially these chips would be on a board that could be plugged to the pandora ext port (directly or via cable) and would have 8 (or more if we pass through the line in/out & tv-out?) pins of output:
GND, UART2 RX&TX, UART3 RX,TX,RTS,CTS, Vcc (3.3 or 5)
The MAX756 can easily be switched for 3.3V or 5V operation so it would be easy to configure for whatever device you want to attach. I've also crunced some current numbers for you. Given 80% efficiency (its upto 87%) the 5V output would have ~90mA. If set to 3.3V then you would have ~136 mA.
And yeah, one question for someone who knows the system, what happens if the 2.8V 200mA source is overloaded? Will it safely shutdown or will the entire pandora go down with it or what? Will it damage the device?
First i want to say that I'm just playing with the idea and I'm more like asking for this - essentially asking how many would like this and if somebody (maybe even OP?) would like to kit&sell or something.
So to the idea. The pandora has an EXT connector with 2 UARTS (if i remember correctly the 4-pin (with RTS/CTS) uart pins can also be used as GPIO, can the first too? (if so, 6 GPIO's)) with logic levels of 1.8V and a 2.8V 200 mA power supply. I'm assuming that a 3.3V or 5V supply and logic level conversion (to 3.3 or 5V) would be useful for a lot of people thinking of attaching their own electronics/µC's/whatever to the pandora.
So a simple chip list for my idea:
- 1*1.8V regulator
- 1*MAX756 3.3/5V boost converter
- 2*TXB0104 level converter
It would need some other stuff too, but skipping the listing for now (capacitors, diode, etc)
It's a bit sub-optimal to have 2 TXB0104's for 6 I/O lines (they provide 2*4=8), so if anyone has a better idea, just tell.
So, essentially these chips would be on a board that could be plugged to the pandora ext port (directly or via cable) and would have 8 (or more if we pass through the line in/out & tv-out?) pins of output:
GND, UART2 RX&TX, UART3 RX,TX,RTS,CTS, Vcc (3.3 or 5)
The MAX756 can easily be switched for 3.3V or 5V operation so it would be easy to configure for whatever device you want to attach. I've also crunced some current numbers for you. Given 80% efficiency (its upto 87%) the 5V output would have ~90mA. If set to 3.3V then you would have ~136 mA.
And yeah, one question for someone who knows the system, what happens if the 2.8V 200mA source is overloaded? Will it safely shutdown or will the entire pandora go down with it or what? Will it damage the device?
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