Transmission of data with the MCP3204

Odracir · Joined: 19 Apr 2010 Posts: 1 Location: Mexico, city

Hi, I'm working with ADC MCP3204 of Microchip but I have some doubts about data transmission. I hope that you can help me.

1. If in the driver MCP3204.c, CLK has a frequency of 20KHz, how I can get the 100ksps of the ADC ? I think that it is impossible, I must change the value of delay_us(50) to delay_cycles(40) (when I'm using a crystal of 4 MHz) to get the 100 ksps ?

2. Assuming that I have achieved, how can I transmit so much information via RS232 ? Or it is impossible?

Thanks!

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

Download the MCP3204 data sheet:
http://ww1.microchip.com/downloads/en/DeviceDoc/21298e.pdf
On page 3, it lists the maximum SPI CLK frequency as 2 MHz (at 5 volts).

So if software SPI is too slow, then you can use hardware SPI to talk
to the chip, at an SPI clock speed of 2 MHz (or less). There are several
threads in the forum that have hardware SPI code for the MCP320x
series of ADC chips.

You will need to use a PIC that has a hardware SPI module.
For example, the 16F877 and 18F452 have one.