31 Dec '11, 4am
One Wire Digital Temperature Sensor - DS18B20 - SparkFun Electronics: #biofeedback
I’ve ordered these from here in September and they were the DS18B20’s. They are actually labeled on the face of the IC but you’ll have to use a magnifying glass and strong light to read it to verify what you have. A brief description of the differences between versions: The DS18B20’s have 12 bit resolution capabilties. The original DS1820’s (note lack of B or S) have 9 bit resolution. The DS18S20 (note S) was meant as a drop-in replacement for the original DS1820. It gets a 12 bit temp value but rounds it to a 9 bit value. You CAN however get 12 bit resolution with the DS18S20’s but it requires extra calculations/reading of registers to be done that the DS18B20’s don’t require. The DS18B20’s also allow you to specify 9, 10, 11, or 12 bit resolution programmatically. Taking 9 bit values takes less time and power.