JAJSOF3A May 2023 – September 2023 INA700
PRODUCTION DATA
When the bus is idle, both the SDA and SCL lines are pulled high by the pullup resistors. The main device generates a start condition followed by a valid serial byte containing high-speed (HS) main device code 00001XXX. This transmission is made in fast (400 kHz) or standard (100 kHz) (F/S) mode at no more than 400 kHz. The device does not acknowledge the HS main device code, but does recognize the code and switches internal filters of the device to support 2.94-MHz operation.
The main device then generates a repeated start condition (a repeated start condition has the same timing as the start condition). After this repeated start condition, the protocol is the same as F/S mode, except that transmission speeds up to 2.94 MHz are allowed. Instead of using a stop condition, use repeated start conditions to maintain the bus in HS-mode. A stop condition ends the HS-mode and switches all the internal filters of the device to support the F/S mode.