SLLSF91A December 2018 – January 2020 TCAN4550
PRODUCTION DATA.
The TXD_INT and RXD_INT are internal signal paths that behave like the TXD and RXD pins for a physical layer transceiver. During normal operation they are not accessible to external pins. The TCAN4550 provides a test mode that maps these signals to external pins see Test Mode. The digital logic input and output levels for these devices are CMOS levels with respect to VIO for compatibility with protocol controllers having 3.3 V to 5 V logic or I/O. Table 3 and provides the states of the CAN driver and CAN receiver in each mode.
DEVICE MODE | TXD_INT INPUT | BUS OUTPUTS | DRIVEN BUS STATE | |
---|---|---|---|---|
CANH | CANL | |||
Normal | L | H | L | Dominant |
H or Open | Z | Z | Biased Recessive | |
Standby | X | Z | Z | Weak Pull to GND |
Sleep | X | Z | Z | Weak Pull to GND |
DEVICE MODE | CAN DIFFERENTIAL INPUTS
VID = VCANH – VCANL |
BUS STATE | RXD_INT TERMINAL |
---|---|---|---|
Normal | VID ≥ 0.9 V | Dominant | L |
0.5 V < VID < 0.9 V | Undefined | Undefined | |
VID ≤ 0.5 V | Recessive | H | |
Standby/Sleep | VID ≥ 1.15 V | Dominant | See Figure 24 |
0.4 V < VID < 1.15 V | Undefined | ||
VID ≤ 0.4 V | Recessive | ||
Any | Open (VID ≈ 0 V) | Open | H |