TLE9261-3QX Datasheet, PDF (52/186 Pages) Infineon Technologies AG – Dedicated Data Sheets are available for the different product variants

TLE9261-3QX
5.4.8 Clock and Data Recovery
In order to compensate possible deviations on the CAN oscillator frequency caused by assembly and lifetime
effects, the device features an integrated clock and data recovery (CDR).
It is recommended to always enable the CDR feature during SWK operation.
5.4.8.1 Configuring the Clock Data Recovery for SWK
The Clock and Data Recovery can be optionally enabled or disabled with the CDR_EN bit in the
SWK_CDR_CTRL1 SPI register. In case the feature is enabled, the CAN bit stream will be measured and the
internal clock used for the CAN frame decoding will be updated accordingly.
Before the Clock and Data Recovery can be used it must be configured properly related to the used baud rate and
filtering characteristics (see Chapter 5.4.8.2).
It is strongly recommended not to enable/disable the Clock Recovery during a active CAN Communication.
To ensure this, it is recommended to enable/disable it during CAN OFF (BUS_CTRL_1; CAN[2:0] = 000).
80 Mhz Oscilator
( analog )
CDR
Aquisition
Filter
RX
CAN Receiver
( analog )
Sampling
Point
Calculation
Figure 15 Clock and Data Recovery Block Diagram
CAN
Protocoll
Handler
Data Sheet
52
Rev. 1.1, 2014-09-26