TLE8262-2E Datasheet, PDF (30/94 Pages) Infineon Technologies AG – Universal System Basis Chip

TLE8262-2E
High Speed CAN Transceiver
8.2.1 CAN Normal Mode
To transfer the CAN transceiver into the CAN Normal Mode, an SPI word must be sent. This mode is designed for
normal data transmission/reception within the HS CAN network. It can be accessed in Normal Mode of the SBC,
as well as in SBC Software Flash Mode, and SBC Software Development Mode.
Transmission
The signal from the microcontroller is applied to the TxDCAN input of the SBC. The bus driver switches the
CANH/L output stages to transfer this input signal to the CAN bus lines.
Reduced Electromagnetic Emission
To reduce electromagnetic emissions (EME), the bus driver controls CANH/L slopes symmetrically.
Reception
Analog CAN bus signals are converted into digital signals at RxD via the differential input receiver. In CAN Normal
and CAN Receive Only Mode, the split pin is used to stabilize the Recessive Common Mode signal. The RxD pin
is diagnosed and the detected failure is reported to the SPI diagnostic register.
8.2.2 CAN Wake Capable Mode
This mode, which can be used in SBC Stop, Sleep, Restart and Normal Modes by programming via SPI and is
automatically accessed in SBC Fail-Safe Mode, is used to monitor bus activities. A wake up signal on the bus
results in different behavior of the SBC, as described in Table 6. After wake-up the transceiver can be switched
to CAN Normal Mode for communication. To enable the CAN wakeable mode after a wake via CAN, the CAN
transceiver must be switched to CAN Normal Mode, CAN Receive Only Mode or CAN Off, before switching to CAN
Wakeable Mode again.
Table 6 Action Due to a CAN Wake Up
SBC Mode
SBC Mode after wake Vcc1µC
INT
Sleep Mode
Restart Mode
Stop Mode
Stop Mode
Restart Mode
Restart Mode
Fail-Safe Mode
Restart Mode
Normal Mode
Normal Mode
1) When not masked via SPI
Ramping up
ON
Ramping up / ON
Ramping up
ON
HIGH
LOW¹⁾
HIGH
HIGH
LOW¹⁾
RxD
LOW
LOW
LOW
LOW
LOW
Int. Bit
WK CAN
1
1
1
1
1
Wake-Up in SBC Sleep Mode
Wake-up is possible via a CAN message (filtering time t > t_WU), it automatically transfers the SBC into the SBC
Restart Mode and from there to Normal Mode the RxD pins in set to LOW, see Figure 11. The microcontroller is
able to detect the low signal on RxD and to read the wake source out of the “Wake Register Interrupt” register
(000) via SPI. No Interrupt is generated when coming out of Sleep Mode.
Data Sheet
30
Rev. 1.0, 2009-05-26