SparkFun Forums

[lopb]

Hi, i'm trying to build the msp430-JTAG programmer with this schematic http://www.olimex.com/dev/images/msp430-jtag-d-sch.gif
Can somebody tell me what is the d1 adn d2 the pin 4 where does it go rom d2 and the pins form u2d where there are connected? because in the schematic is superimposed.
THanks!

[gm]

D1 and D2 are dual diodes with a common cathode. They are used to route power to the JTAG. The anode of one of the diodes in D2 connects to pin 4 of the JTAG connector.

I'm not sure what you mean by "u2d". If you are talking about U2P, that is the power connection for the SN74HC244 and the schematic is showing you that pin 20 should be connected to VCC and pin 10 should be connected to GND and that a 100nF bypass capacitor is connected between VCC and GND.

HTH,

gm

[lopb]

D1 and D2 are dual diodes with a common cathode. They are used to route power to the JTAG. The anode of one of the diodes in D2 connects to pin 4 of the JTAG connector.

I'm not sure what you mean by "u2d". If you are talking about U2P, that is the power connection for the SN74HC244 and the schematic is showing you that pin 20 should be connected to VCC and pin 10 should be connected to GND and that a 100nF bypass capacitor is connected between VCC and GND.

HTH,

gm

Thank you!
i will build it and let you know what happen.

[lopb]

Hi, I was working in other things.. sorry for the delay. I'm about to build this programer.
Can somebody tell me what is VDD? in the circuit schematics?
And About the 74hc244, the output levels are 3V or TTL?
thanks

[gm]

The TPS77030 provides a regulated 3V output.

[leon_heller]

The 74HC244 has CMOS outputs, of course!

[lopb]

Im sorry. Thaks for the answers
One last thing, where does it go the pin4 of the bat54c? It says only pin4...

[gm]

It goes to pin 4 of the JTAG connector.

[lopb]

Sorry to disturb again. Im a little slow with this, is not my area.
Does this connection is right? i'm gonna program a MSP430F135