ZHCSCV4C October 2014 – April 2021 TMP451-Q1
PRODUCTION DATA
For the two-wire bus to operate at frequencies above 1 MHz, the master device must issue a high-speed mode (Hs-mode) master code (0000 1xxx) as the first byte after a start condition to switch the bus to high-speed operation. The TMP451-Q1 device does not acknowledge this byte, but switches the input filters on SDA and SCL and the output filter on SDA to operate in Hs-mode, allowing transfers at up to 2.5 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 TMP451-Q1 device switches the input and output filters back to fast mode operation.