... | @@ -48,10 +48,12 @@ Reading is ((Input_Hi - Input-Lo) / Uref) * 1000. So full scale of 2000 is twic |
... | @@ -48,10 +48,12 @@ Reading is ((Input_Hi - Input-Lo) / Uref) * 1000. So full scale of 2000 is twic |
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*External reference circuits should be designed so that the current drawn from pin 10 is maintained between 50 and 200 microamps.*
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*External reference circuits should be designed so that the current drawn from pin 10 is maintained between 50 and 200 microamps.*
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|EDL-00001 | RV1 | R2 | Uref = Vref_in - Vana_com | Comment |
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Using a [Voltage divider calculator](https://www.digikey.fr/en/resources/conversion-calculators/conversion-calculator-voltage-divider) (Voltage input = 3V, adding RV1 to R2 or to R1), gives the following range of Uref.
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| -------- | --- | -------- | --------------------------| ------- |
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| V2-0 | 5k | 17k4 | 0.25V - 0.86 V |Original, as in schematic |
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|EDL-00001 | R1 | RV1 | R2 | Uref = Vref_in - Vana_com | Iref | Comment |
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| V2-1 | 5k | [8k87](https://fr.farnell.com/neohm-te-connectivity/yr1b8k87cc/resistance-couche-metal-8k87-250mw/dp/1083357) | 0.40V - 1.32V | Allows for more sensitive sensors |
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| -------- | --- | ----| -------- | --------------------------| -----| ------- |
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| V2-0 | 2k | 5k | 17k4 | 0.25V - 0.86 V | 3V/24k4 = 120 uA | Original, as in schematic |
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| V2-1 | 2k | 5k | 8k87 | 0.40V - 1.32V | 3V/15k87 = 189 uA | Allows for more sensitive sensors |
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... | @@ -96,4 +98,4 @@ Reading is ((Input_Hi - Input-Lo) / Uref) * 1000. So full scale of 2000 is twic |
... | @@ -96,4 +98,4 @@ Reading is ((Input_Hi - Input-Lo) / Uref) * 1000. So full scale of 2000 is twic |
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-----
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-----
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Erik van der Bij - 1 September 2020 |
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Erik van der Bij - 22 January 2023 |