05/21/04 - DS18B20's B7 die chips identified

Thanks to Brian D. Hindman at Dallas Semiconductor we now has a list of serial numbers that identifiy B7 die DS18B20's.

To tell if your DS18B20 has the B7 die corruption problems:

1. Read the 18B20's ROM code. Look at only the serial number portion of the ROM code:

0xCC00000SSSSSSS28

where CC is the CRC
00000 is the customer code
SSSSSSS is the serial number
28 is the family code

2. The serial number will tell the device's die revision as follows:

If the number is equal to or less than 0x054BBDF the device is a B6

If the number is in the range 0x54BBDF - 0x0662B4F the device is a B7

If the number is equal to or greater than 0x0662B50 the device is a C2