Hello Team,
Please tell me the Icc at the following bus fault.
1) CANH = 0V
2) CANL = 12V
※The other conditions are the same as the test conditions of Normal mode (dominant - with bus fault)
Best regards,
Kato
Hi Junya,
thanks for reaching out and this interesting question!
Above I have drawn the test conditions as you mentioned. Also helpful is Figure 11. Driver Short Circuit Current Test and Measurement on page 15 of the datasheet. Lets assume Vcc = 5 V. Please note that Icc is split up to power the device and also flowing over the CANH transistor to the sink.
In the case of your question the potential difference between Vcc and CANH is 5 V instead of 17 V as mentioned in the datasheet bus fault condition you marked blue. Further if you take a look at the DRIVER ELECTRICAL CHARACTERISTICS on page 9 of the datasheet you can find IOS which shows the current at a potential difference of 10 V between Vcc and CANH/CANL. The following table should help to understand the coherence.
| Vcc | CANH | Icc |
| 5 V | -12 V | max 180 mA |
| 5 V | -5 V | max 100 mA |
| 5 V | 0 V | <50 mA (assumption) |
Pleas take note connecting the CANL to +12 V will also result in a current IOS which is max 100 mA at +40 V
Let me know if this is helping you out, don't hesitate to ask!
Kind regards
Dierk
