SBOA542 November   2022 TMP1826 , TMP1827

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
    1. 1.1 Bus Reset and Response
    2. 1.2 Host Write, Device Read
    3. 1.3 Host Read, Device Write
  4. 2Interfacing TMP1826 With the Host MCU
    1. 2.1 Using GPIO as Host Interface
    2. 2.2 Software Driver for GPIO
    3. 2.3 Using UART as Host Interface
    4. 2.4 Software Driver for UART
    5. 2.5 Using SPI as Host Interface
    6. 2.6 Software Driver for SPI
  5. 3Summary
  6. 4References

1.2 Host Write, Device Read

A host write is the means by which the host sends the command, function, and data to the devices. A host write starts by the host driving the data line low as shown in Figure 1-3. If the host intends to transmit a logic '1', the line is released after tWR1L time. If the host intends to transmit a logic '0', the line is released after tWR0L. After releasing the data, the pullup resistor causes the line to become high till the beginning of the next time slot. The device samples the line after tRDV has elapsed from the falling edge, for a time frame indicated by tDSW. The host must factor the rise time due to the pullup resistor and bus capacitance to determine the release of the data line before the line is sampled by the device and the host drives the next write bit time slot.

Figure 1-3 Host Write, Device Read