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diff --git a/Documentation/hwmon/da9052 b/Documentation/hwmon/da9052 deleted file mode 100644 index 5bc51346b689..000000000000 --- a/Documentation/hwmon/da9052 +++ /dev/null @@ -1,61 +0,0 @@ -Supported chips: - * Dialog Semiconductors DA9052-BC and DA9053-AA/Bx PMICs - Prefix: 'da9052' - Datasheet: Datasheet is not publicly available. - -Authors: David Dajun Chen <dchen@diasemi.com> - -Description ------------ - -The DA9052/53 provides an Analogue to Digital Converter (ADC) with 10 bits -resolution and track and hold circuitry combined with an analogue input -multiplexer. The analogue input multiplexer will allow conversion of up to 10 -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: ICH - internal battery charger current measurement -Channel 2: TBAT - output from the battery NTC -Channel 3: VBAT - measurement of the battery voltage -Channel 4: ADC_IN4 - high impedance input (0 - 2.5V) -Channel 5: ADC_IN5 - high impedance input (0 - 2.5V) -Channel 6: ADC_IN6 - high impedance input (0 - 2.5V) -Channel 7: XY - TSI interface to measure the X and Y voltage of the touch - screen resistive potentiometers -Channel 8: Internal Tjunc. - sense (internal temp. sensor) -Channel 9: VBBAT - measurement of the backup battery voltage - -By using sysfs attributes we can measure the system voltage VDDOUT, the battery -charging current ICH, battery temperature TBAT, battery junction temperature -TJUNC, battery voltage VBAT and the back up battery voltage VBBAT. - -Voltage Monitoring ------------------- - -Voltages are sampled by a 10 bit ADC. - -The battery voltage is calculated as: - Milli volt = ((ADC value * 1000) / 512) + 2500 - -The backup battery voltage is calculated as: - Milli volt = (ADC value * 2500) / 512; - -The voltages on ADC channels 4, 5 and 6 are calculated as: - Milli volt = (ADC value * 2500) / 1023 - -Temperature Monitoring ----------------------- - -Temperatures are sampled by a 10 bit ADC. Junction and battery temperatures -are monitored by the ADC channels. - -The junction temperature is calculated: - Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8 -The junction temperature attribute is supported by the driver. - -The battery temperature is calculated: - Degree Celsius = 1 / (t1 + 1/298)- 273 -where t1 = (1/B)* ln(( ADCval * 2.5)/(R25*ITBAT*255)) -Default values of R25, B, ITBAT are 10e3, 3380 and 50e-6 respectively. |