path: root/Documentation/hwmon
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authorGuenter Roeck <>2014-01-24 22:25:33 -0800
committerGuenter Roeck <>2014-03-03 08:01:04 -0800
commitb4c9c1a7987ef07d8345bf9d19f36d97423b6b25 (patch)
tree168998980521b3e9ea35de589bcc707b2fdcf8b7 /Documentation/hwmon
parentebf5e87791a97a7b71d5bd52e0382321a56bb12b (diff)
hwmon: Driver for TI ADC128D818
ADC128D818 is a System Monitor with Temperature Sensor. It is similar to LM80 and LM96080, but has 16 bit wide sensor registers and no fan speed monitoring. Signed-off-by: Guenter Roeck <>
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+Kernel driver adc128d818
+Supported chips:
+ * Texas Instruments ADC818D818
+ Prefix: 'adc818d818'
+ Addresses scanned: I2C 0x1d, 0x1e, 0x1f, 0x2d, 0x2e, 0x2f
+ Datasheet: Publicly available at the TI website
+Author: Guenter Roeck
+This driver implements support for the Texas Instruments ADC128D818.
+It is described as 'ADC System Monitor with Temperature Sensor'.
+The ADC128D818 implements one temperature sensor and seven voltage sensors.
+Temperatures are measured in degrees Celsius. There is one set of limits.
+When the HOT Temperature Limit is crossed, this will cause an alarm that will
+be reasserted until the temperature drops below the HOT Hysteresis.
+Measurements are guaranteed between -55 and +125 degrees. The temperature
+measurement has a resolution of 0.5 degrees; the limits have a resolution
+of 1 degree.
+Voltage sensors (also known as IN sensors) report their values in volts.
+An alarm is triggered if the voltage has crossed a programmable minimum
+or maximum limit. Note that minimum in this case always means 'closest to
+zero'; this is important for negative voltage measurements. All voltage
+inputs can measure voltages between 0 and 2.55 volts, with a resolution
+of 0.625 mV.
+If an alarm triggers, it will remain triggered until the hardware register
+is read at least once. This means that the cause for the alarm may
+already have disappeared by the time the alarm is read. The driver
+caches the alarm status for each sensor until it is at least reported
+once, to ensure that alarms are reported to user space.
+The ADC128D818 only updates its values approximately once per second;
+reading it more often will do no harm, but will return 'old' values.
+In addition to the scanned address list, the chip can also be configured for
+addresses 0x35 to 0x37. Those addresses are not scanned. You have to instantiate
+the driver explicitly if the chip is configured for any of those addresses in
+your system.