Search found 1461 matches

by YahooArchive
Thu Feb 14, 2013 2:09 pm
Forum: Other Hardware interfaces
Topic: DAC recommendations
Replies: 3
Views: 6226

Re: DAC recommendations

Yes. it must be a controlled current. I'm sure 8-10 bits is sufficient
resolution.
by YahooArchive
Thu Feb 14, 2013 2:07 pm
Forum: Other Hardware interfaces
Topic: DAC recommendations
Replies: 3
Views: 6226

Re: DAC recommendations

The SuperPRO has a 10 bit DAC on one of the AD pins.

Other than that I like the MicroChip MCP47x6 which is available in different #
of bits, and is quite small, easy to use...

As for sinking 1A are you saying a controlled current source/sink for that or
just a switch like a big MOSFET.
by YahooArchive
Thu Feb 14, 2013 2:07 pm
Forum: Other Hardware interfaces
Topic: DAC recommendations
Replies: 3
Views: 6226

DAC recommendations

I just determined that I need a DAC for my application. Can I get a
recommendation of a DAC that will integrate with the Pro board easily?

I also need to sink 0 < 1 Amp of current in a Digital-to-current operation. I
don't think that's an off-the-shelf part.
by YahooArchive
Thu Feb 14, 2013 2:05 pm
Forum: Software issues
Topic: load C jumper
Replies: 1
Views: 3704

Re: load C jumper

When using an FTDI cable or SparkFun breakout board, this is needed, as the
documents state. Both of those only have one control output for RESET. To
force ISP mode you need to hold the loadC pin low which our USB dongle does.
MakeItC also prompts you for that if you tell it you are in Manual mode.
by YahooArchive
Thu Feb 14, 2013 2:04 pm
Forum: Software issues
Topic: load C jumper
Replies: 1
Views: 3704

load C jumper

I downloaded Flash.C to the Pro board. I needed to put a jumper between the
LoadC pins. I have to remove the jumper again to run the code.
by YahooArchive
Thu Feb 14, 2013 1:57 pm
Forum: SPI and I2C
Topic: SPI clock speed
Replies: 3
Views: 6445

Re: SPI clock speed

If you change PCLK you change it for all peripherals in the LPC17xx family, a
bad thing in BASIC

But almost all peripherals have pre-scalers of some sort to control the
frequency

in the SPI it's the S0SPCCR

in the 2 SSPs it's the CPSR
by YahooArchive
Thu Feb 14, 2013 1:57 pm
Forum: SPI and I2C
Topic: SPI clock speed
Replies: 3
Views: 6445

Re: SPI clock speed

Ok, thanks. But the only choices for PCLKSEL0 are CCLK, CCLK/2, CCLK/4, and
CCLK/8. CCLK/8 will only give me 96/8= 12MHz. My max for my slave device is
10MHz. How and what do I change to get this down to 10 MHz?
by YahooArchive
Thu Feb 14, 2013 1:56 pm
Forum: SPI and I2C
Topic: SPI clock speed
Replies: 3
Views: 6445

Re: SPI clock speed

CCLK is 96 MHz

PCLK is 24 MHz
by YahooArchive
Thu Feb 14, 2013 1:56 pm
Forum: SPI and I2C
Topic: SPI clock speed
Replies: 3
Views: 6445

SPI clock speed

I am trying to find in the User manual what the clock speed I am running at. I have a Super Pro Plus. According to the PCLK_SPI bits in the PCLKSEL0 register they are set by default to 00 (CCLK/4). But what is this speed? I think the CCLK is dependent on the PLL clock but I do not know where to find...