SBOS473I March 2009 – December 2018 TMP112
For the two-wire bus to operate at frequencies above 400 kHz, the master device must issue an Hs-mode master code (0000 1xxx) as the first byte after a START condition to switch the bus to high-speed operation. The TMP112 family does not acknowledge this byte, but switches the input filters on the SDA and SCL pins and the output filters on the SDA pin to operate in Hs-mode, thus allowing transfers at up to 2.85 MHz. After the Hs-mode master code has been issued, the master transmits a two-wire slave address to initiate a data-transfer operation. The bus continues to operate in Hs-mode until a STOP condition occurs on the bus. Upon receiving the STOP condition, the TMP112 family switches the input and output filters back to fast-mode operation.