5 V Power board side Main board side
5 V Power board side Main board side INA 220 5 V 3. 3 V 1. 8 V 5 V 3. 3 V 2. 2 K Master Vref. A I 2 CA 10 K Vref 1 I 2 C 1 Vref. B I 2 CB Vref 2 I 2 C 2 5 V 5 V PCA 9306 LSF 0102 DCTR INA 220 5 V 3. 3 V HDC 1080 Use 1. 5 m cable to connect 10 K or 100 K Light sensor
We tried to adjust pulled high resistor(10 K&100 K) at ALS I 2 C. It looked like no difference Pulled high 10 K at ALS I 2 C bus Pulled high 100 K at ALS I 2 C bus
All sensor can be got data as the following figure
5 V Power board side Main board side INA 220 5 V 3. 3 V 1. 8 V 5 V 3. 3 V 2. 2 K Master Vref. A I 2 CA 6. 8 K Vref 1 I 2 C 1 Vref. B I 2 CB Vref 2 I 2 C 2 5 V 5 V PCA 9306 LSF 0102 DCTR INA 220 5 V 3. 3 V HDC 1080 Use 1. 5 m cable to connect 10 K or 100 K Light sensor
We tried to adjust pulled high resistor(6. 8 K) at INA 220 I 2 C bus. Sometimes the data be lost for ALS. Pulled high 6. 2 K at INA 220 I 2 C bus ALS data lost
Because the I 2 C of INA 220 is not met I 2 C spec. We try to adjust pull high resistor to change the raising time. But when the pull high(2. 2 K) at INA 220 I 2 C bus, all I 2 C address can not capture. We try to disconnect the ALS cable and it’s also not got other sensor address 5 V Power board side Main board side 5 V 3. 3 V 1. 8 V Master Vref. A Vref. B I 2 CA I 2 CB LSF 0102 DCTR 3. 3 V 2. 2 K Vref 1 Vref 2 I 2 C 1 I 2 C 2 PCA 9306 2. 2 K 5 V 5 V 5 V 3. 3 V Use 1. 5 m cable to connect 10 K 5 V Light sensor INA 220 HDC 1080
If we pulled high(2. 2 K) at INA 220 I 2 C bus or disconnected ALS , all sensors can not be captured address. When we loaded this address, the SDA will be pulled low.
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