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DS1620 CLK problem

Topic last updated 19 Jun 2009, by Michael Beach. 3 replies
wen xingxing
05 Jun 2009

Hi,

the project is DS1620(Digital Thermometer and Thermostat),the problem is how can control the CLK?use PWM?

anybody has any idea?

Thanks a lot!

SHF

Chris Styles
05 Jun 2009 . Edited: 05 Jun 2009

Hi,

This might not be that helpful, especially if you already have the DS1620 part, but I've already done something pretty similar with the MAX6662:

http://mbed.co.uk/projects/cookbook/wiki/SPIThermometer

Having said this, it looks pretty similar to the MAX6662. Instead of driving CS low, you drive RST high, and then use SPI as you would for MAX6662

http://datasheets.maxim-ic.com/en/ds/DS1620.pdf
http://datasheet.digchip.com/280/280-20345-0-MAX6662.pdf

HTH,
Chris

 

Simon Craske
16 Jun 2009

Based on my experience of DS1620 many years ago, I didn't think there was any minimum limit on clock frequency, so I'd just drive CLK using GPIO as per the rest of the 3-wire interface.

hth
s.

Michael Beach
19 Jun 2009

Hi,

The LM75 will give a thermometer and threshold function but uses I2C....