--- zzzz-none-000/linux-3.10.107/Documentation/w1/slaves/w1_therm 2017-06-27 09:49:32.000000000 +0000 +++ scorpion-7490-727/linux-3.10.107/Documentation/w1/slaves/w1_therm 2021-02-04 17:41:59.000000000 +0000 @@ -11,12 +11,14 @@ Description ----------- -w1_therm provides basic temperature conversion for ds18*20 devices. +w1_therm provides basic temperature conversion for ds18*20 devices, and the +ds28ea00 device. supported family codes: W1_THERM_DS18S20 0x10 W1_THERM_DS1822 0x22 W1_THERM_DS18B20 0x28 W1_THERM_DS1825 0x3B +W1_THERM_DS28EA00 0x42 Support is provided through the sysfs w1_slave file. Each open and read sequence will initiate a temperature conversion then provide two @@ -48,3 +50,10 @@ maximum current draw of 1.5mA and that a 5k pullup resistor is not sufficient. The strong pullup is designed to provide the additional current required. + +The DS28EA00 provides an additional two pins for implementing a sequence +detection algorithm. This feature allows you to determine the physical +location of the chip in the 1-wire bus without needing pre-existing +knowledge of the bus ordering. Support is provided through the sysfs +w1_seq file. The file will contain a single line with an integer value +representing the device index in the bus starting at 0.