Hello Ezra,
I am using ICP-ISP bridge code v16. I hope you are using same. I am using LPC932 on MCB900 to hold the bridge.
My T1 & T2 are 100msec.
In VDD circuit of ICP-method, if you use one npn Tr then Vdd drops below 2.7v (3.3-0.65). Brownout protection becomes active as all fresh chips are brown-out enabled. You need to use npn-pnp pair, so voltage remains near 3.1V. Or you can use MOS-Tr, if you know the technique.
I have MCB900v4 PCB. Circuit attached. Circuit slighly differs from PCB V1 to V4. Although 6VDC should be OK, MCB900 behaviour is TYPICAL. I am using 5V regulated Linear PSU for powering up through jack. But its better to use give power through 2pin relimate connector marked VIN near 9pin connector.
Also check version of LPC9xx you are trying to program, as some of them support only ISP!, I read somewhere.
I hope this helps.
With warm regards.
Yours truly,
Hitesh Mahant
www.vital4all.com
PROGRESS of your life depends only on SIZE and QUALITY of your Goals. And the secret of success achieving them is "How discipliend YOU ARE".
I am using ICP-ISP bridge code v16. I hope you are using same. I am using LPC932 on MCB900 to hold the bridge.
My T1 & T2 are 100msec.
In VDD circuit of ICP-method, if you use one npn Tr then Vdd drops below 2.7v (3.3-0.65). Brownout protection becomes active as all fresh chips are brown-out enabled. You need to use npn-pnp pair, so voltage remains near 3.1V. Or you can use MOS-Tr, if you know the technique.
I have MCB900v4 PCB. Circuit attached. Circuit slighly differs from PCB V1 to V4. Although 6VDC should be OK, MCB900 behaviour is TYPICAL. I am using 5V regulated Linear PSU for powering up through jack. But its better to use give power through 2pin relimate connector marked VIN near 9pin connector.
Also check version of LPC9xx you are trying to program, as some of them support only ISP!, I read somewhere.
I hope this helps.
With warm regards.
Yours truly,
Hitesh Mahant
www.vital4all.com
PROGRESS of your life depends only on SIZE and QUALITY of your Goals. And the secret of success achieving them is "How discipliend YOU ARE".