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| author | Mulin Chao <mlchao@nuvoton.com> | 2016-02-15 15:53:28 +0800 |
|---|---|---|
| committer | chrome-bot <chrome-bot@chromium.org> | 2016-02-17 02:02:03 -0800 |
| commit | 38c64408f77a9efbf39091cf7d34e185272673c3 (patch) | |
| tree | 1b671d4f6dc3932dd53ea7a7cbb6d727b28d45a8 | |
| parent | 86bcc30068b44ec47660a7a2a68221ad3ba6666b (diff) | |
| download | chrome-ec-38c64408f77a9efbf39091cf7d34e185272673c3.tar.gz | |
wheatley / nuc: Modified the internal ref voltage of ADC to 2.816V
In order to prevent the influence of the deviation of AVCC during ADC
conversion, the internal reference voltage (Vref) of ADC is fixed to
2.816V even it derives from AVCC.
Modified sources:
1. wheatley/board.c: Modified max adc voltage of ADC to 28.160V.
2. adc_chip.h: Modified internal ref voltage of ADC to 2.816V.
BUG=chrome-os-partner:34346
TEST=make buildall -j; test nuvoton IC specific drivers
BRANCH=none
Change-Id: Ib514f4bdc114802870eb3c77c650e18c05eb9617
Signed-off-by: Mulin Chao <mlchao@nuvoton.com>
Reviewed-on: https://chromium-review.googlesource.com/327046
Reviewed-by: Shawn N <shawnn@chromium.org>
| -rw-r--r-- | board/wheatley/board.c | 4 | ||||
| -rw-r--r-- | chip/npcx/adc_chip.h | 2 |
2 files changed, 3 insertions, 3 deletions
diff --git a/board/wheatley/board.c b/board/wheatley/board.c index e8166903c1..e0947fc933 100644 --- a/board/wheatley/board.c +++ b/board/wheatley/board.c @@ -111,8 +111,8 @@ BUILD_ASSERT(ARRAY_SIZE(power_signal_list) == POWER_SIGNAL_COUNT); /* ADC channels */ const struct adc_t adc_channels[] = { - /* Vbus sensing. Converted to mV, full ADC is equivalent to 33V. */ - [ADC_VBUS] = {"VBUS", NPCX_ADC_CH1, 33000, ADC_READ_MAX+1, 0}, + /* Vbus sensing. Converted to mV, full ADC is equivalent to 28.16V. */ + [ADC_VBUS] = {"VBUS", NPCX_ADC_CH1, 28160, ADC_READ_MAX+1, 0}, /* Adapter current output or battery discharging current */ [ADC_AMON_BMON] = {"AMON_BMON", NPCX_ADC_CH4, 55000, 6144, 0}, /* System current consumption */ diff --git a/chip/npcx/adc_chip.h b/chip/npcx/adc_chip.h index 8ee59519af..ab2caa9e6a 100644 --- a/chip/npcx/adc_chip.h +++ b/chip/npcx/adc_chip.h @@ -11,7 +11,7 @@ /* Minimum and maximum values returned by raw ADC read. */ #define ADC_READ_MIN 0 #define ADC_READ_MAX 1023 -#define ADC_MAX_VOLT 3300 +#define ADC_MAX_VOLT 2816 /* ADC input channel select */ enum npcx_adc_input_channel { |