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| author | Bhuvanchandra DV <bhuvanchandra.dv@toradex.com> | 2015-10-19 21:24:36 +0530 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2015-10-25 12:12:29 +0000 |
| commit | 6219f432ec037317a77c40910da12a626c34af1c (patch) | |
| tree | 82e046705eabcaae564989f3e7cae6381be73575 /drivers/staging | |
| parent | b94e22805a2224061bb263a82b72e09544a5fbb3 (diff) | |
| download | op-kernel-dev-6219f432ec037317a77c40910da12a626c34af1c.zip op-kernel-dev-6219f432ec037317a77c40910da12a626c34af1c.tar.gz | |
vf610_adc: Fix internal temperature calculation
Calculate ADCR_VTEMP25 using VTEMP25 at VREFH_ADC 3V3. Existing
calculations consider the typical values provided in datasheet.
Those typical values are valid for VREFH_ADC at 3.0V. VTEMP25
is different for different VREFH_ADC voltages. With VREFH_ADC
at 3.3V, voltage at 25°C is 0.699V. Hence update the VTEMP25
to 0.699V which gives ADCR@Temp25 as 867.
Formula for finding ADCR@Temp25:
ADCR@Temp25 = (ADCR@Vdd * V@TEMP25 * 10) / VDDconv
ADCR@Vdd for 12-Bit ADC = 4095
VDDconv = VREFH_ADC * 10
VREFH_ADC@3.3V
ADCR@Temp25 = (4095 * .699 * 10) / 33
ADCR@Temp25 ~= 867
| VREFH_ADC | V@TEMP25 | VDDconv | ADCR@Temp25 |
| 3.0V | 0.696mV | 30 | 950 |
| 3.3V | 0.699mV | 33 | 867 |
Signed-off-by: Bhuvanchandra DV <bhuvanchandra.dv@toradex.com>
Acked-by: Fugang Duan <B38611@freescale.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/staging')
0 files changed, 0 insertions, 0 deletions
