About Kernel Documentation Linux Kernel Contact Linux Resources Linux Blog

Documentation / hwmon / adc128d818




Custom Search

Based on kernel version 3.16. Page generated on 2014-08-06 21:39 EST.

1	Kernel driver adc128d818
2	========================
3	
4	Supported chips:
5	  * Texas Instruments ADC818D818
6	    Prefix: 'adc818d818'
7	    Addresses scanned: I2C 0x1d, 0x1e, 0x1f, 0x2d, 0x2e, 0x2f
8	    Datasheet: Publicly available at the TI website
9	               http://www.ti.com/
10	
11	Author: Guenter Roeck
12	
13	Description
14	-----------
15	
16	This driver implements support for the Texas Instruments ADC128D818.
17	It is described as 'ADC System Monitor with Temperature Sensor'.
18	
19	The ADC128D818 implements one temperature sensor and seven voltage sensors.
20	
21	Temperatures are measured in degrees Celsius. There is one set of limits.
22	When the HOT Temperature Limit is crossed, this will cause an alarm that will
23	be reasserted until the temperature drops below the HOT Hysteresis.
24	Measurements are guaranteed between -55 and +125 degrees. The temperature
25	measurement has a resolution of 0.5 degrees; the limits have a resolution
26	of 1 degree.
27	
28	Voltage sensors (also known as IN sensors) report their values in volts.
29	An alarm is triggered if the voltage has crossed a programmable minimum
30	or maximum limit. Note that minimum in this case always means 'closest to
31	zero'; this is important for negative voltage measurements. All voltage
32	inputs can measure voltages between 0 and 2.55 volts, with a resolution
33	of 0.625 mV.
34	
35	If an alarm triggers, it will remain triggered until the hardware register
36	is read at least once. This means that the cause for the alarm may
37	already have disappeared by the time the alarm is read. The driver
38	caches the alarm status for each sensor until it is at least reported
39	once, to ensure that alarms are reported to user space.
40	
41	The ADC128D818 only updates its values approximately once per second;
42	reading it more often will do no harm, but will return 'old' values.
43	
44	In addition to the scanned address list, the chip can also be configured for
45	addresses 0x35 to 0x37. Those addresses are not scanned. You have to instantiate
46	the driver explicitly if the chip is configured for any of those addresses in
47	your system.
Hide Line Numbers
About Kernel Documentation Linux Kernel Contact Linux Resources Linux Blog

Information is copyright its respective author. All material is available from the Linux Kernel Source distributed under a GPL License. This page is provided as a free service by mjmwired.net.