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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
- http://www.ti.com/
- Author: Guenter Roeck
- Description
- -----------
- 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.
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