diff options
Diffstat (limited to 'Documentation/hwmon/da9055')
| -rw-r--r-- | Documentation/hwmon/da9055 | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/Documentation/hwmon/da9055 b/Documentation/hwmon/da9055 index 855c3f536e00..beae271a3312 100644 --- a/Documentation/hwmon/da9055 +++ b/Documentation/hwmon/da9055 @@ -1,6 +1,11 @@ +Kernel driver da9055 +==================== + Supported chips: * Dialog Semiconductors DA9055 PMIC + Prefix: 'da9055' + Datasheet: Datasheet is not publicly available. Authors: David Dajun Chen <dchen@diasemi.com> @@ -15,11 +20,12 @@ different inputs. The track and hold circuit ensures stable input voltages at the input of the ADC during the conversion. The ADC is used to measure the following inputs: -Channel 0: VDDOUT - measurement of the system voltage -Channel 1: ADC_IN1 - high impedance input (0 - 2.5V) -Channel 2: ADC_IN2 - high impedance input (0 - 2.5V) -Channel 3: ADC_IN3 - high impedance input (0 - 2.5V) -Channel 4: Internal Tjunc. - sense (internal temp. sensor) + +- Channel 0: VDDOUT - measurement of the system voltage +- Channel 1: ADC_IN1 - high impedance input (0 - 2.5V) +- Channel 2: ADC_IN2 - high impedance input (0 - 2.5V) +- Channel 3: ADC_IN3 - high impedance input (0 - 2.5V) +- Channel 4: Internal Tjunc. - sense (internal temp. sensor) By using sysfs attributes we can measure the system voltage VDDOUT, chip junction temperature and auxiliary channels voltages. @@ -31,9 +37,11 @@ Voltages are sampled in a AUTO mode it can be manually sampled too and results are stored in a 10 bit ADC. The system voltage is calculated as: + Milli volt = ((ADC value * 1000) / 85) + 2500 The voltages on ADC channels 1, 2 and 3 are calculated as: + Milli volt = (ADC value * 1000) / 102 Temperature Monitoring @@ -43,5 +51,7 @@ Temperatures are sampled by a 10 bit ADC. Junction temperatures are monitored by the ADC channels. The junction temperature is calculated: + Degrees celsius = -0.4084 * (ADC_RES - T_OFFSET) + 307.6332 + The junction temperature attribute is supported by the driver. |