TLIN1029-Q1: Characteristics Comparison between TJA1027

Ken,

The duty cycle parameter in the datasheet is from the LIN standard. The numbers seen in the 'MIN' and 'MAX' columns are the numbers that need to be met in order to adhere to the standard, which is why these are the same across both datasheets.

This number is specified because there is no clock embedded in the data or sent in parallel as another part of the communication scheme, thus all the LIN nodes rely on the master's initial SYNC field signal to synchronize as a cluster. If there is duty cycle variation, the Master and/or Slaves clock signal will begin to vary, and once this becomes too great of variation, the timing of communication will degrade and eventually fail.

The number multiplied by VSUP is the result of an equation and initial conditions that the device and pins are under. The values in the equation are different between devices because the conditions are different, and the design of the device is different, so separate formulas were used to generate the specified duty cycle.

Specification Differences

One major difference between the TJA1027 and the TLIN1029 is that the TJA1027 has no dominant timeout feature, where the TLIN1029 does.

The LIN and VBAT pins on the TLIN1029 are able to go up to +45V absolute maximum, while the TJA1027 can only go up to +42V. However, the logic pins on the TLIN1029 are only rated for +5.5V maximum, while the TJA1027 logic pins are rated for +7V.

The Normal Mode Recessive bus current on the TLIN1029 is significantly less (300uA typical, 650uA maximum) relative to the TJA1027 (800uA typical, 1600uA maximum).

Normal mode initialization timing is longer on the TLIN1029, at 35us maximum, while it is 20us maximum on TJA1027.

The typical time for the LIN bus to register a dominant pulse for wake up pattern is 65us on TLIN1029, while it is 80us on the TJA1027.

Those are the most significant differences I could find looking through both datasheets, otherwise the devices should drop in and replace each other seamlessly. Please let me know if you have any other questions or concerns.

Regards,