diff options
| author | ben chen <ben.chen2@quanta.corp-partner.google.com> | 2022-10-28 14:38:26 +0800 |
|---|---|---|
| committer | Chromeos LUCI <chromeos-scoped@luci-project-accounts.iam.gserviceaccount.com> | 2022-11-04 04:46:29 +0000 |
| commit | 1ce62eb825053fcc11ed4b1b53b48b0f0afb6b23 (patch) | |
| tree | 3dc85adb79d3bc9455fb5eff96e8da27558df119 /board/kuldax | |
| parent | 3dcbbe1f41af95beb807f5f4f01143a6b7d3f88f (diff) | |
| download | chrome-ec-1ce62eb825053fcc11ed4b1b53b48b0f0afb6b23.tar.gz | |
kuldax: modify ADC channel 3 configuration
modify ADC channel 3 IMON scale, be sure the
retuened value will not overflow integer.
V,rsense = 0.005 * 1
V,ina_output = 50 * 0.005 (or 50/200) = 0.25v
V,ec = (20/(20+8.66)) * 0.25 = 0.17446v
To scale the result to 1amp then V,ec * 1/((20/(20+8.66))*50/200)
,or V,ec * 143/25.
BUG=b:255902516
BRANCH=none
TEST=use "adc" console command check value.
Change-Id: I1e76b93cb85edd3c4096f1413d6d4313c6eb8583
Signed-off-by: Ben Chen <ben.chen2@quanta.corp-partner.google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3990465
Reviewed-by: Derek Huang <derekhuang@google.com>
Reviewed-by: Daniel Coggin <dcoggin@google.com>
Commit-Queue: Derek Huang <derekhuang@google.com>
Code-Coverage: Zoss <zoss-cl-coverage@prod.google.com>
Diffstat (limited to 'board/kuldax')
| -rw-r--r-- | board/kuldax/sensors.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/board/kuldax/sensors.c b/board/kuldax/sensors.c index 96f49de8a3..a41d5be713 100644 --- a/board/kuldax/sensors.c +++ b/board/kuldax/sensors.c @@ -46,11 +46,11 @@ const struct adc_t adc_channels[] = { .factor_mul = ADC_MAX_VOLT * 39, .factor_div = (ADC_READ_MAX + 1) * 5, }, - [ADC_PPVAR_IMON] = { /* 872.3 mV/A */ + [ADC_PPVAR_IMON] = { /* 20/(20+8.66)*50/200 */ .name = "PPVAR_IMON", .input_ch = NPCX_ADC_CH3, - .factor_mul = ADC_MAX_VOLT * 1433, - .factor_div = (ADC_READ_MAX + 1) * 1250, + .factor_mul = ADC_MAX_VOLT * 143, + .factor_div = (ADC_READ_MAX + 1) * 25, }, }; |