TCAN1051H Datasheet, PDF (18/35 Pages) Texas Instruments – Fault Protected CAN Transceiver with CAN FD

TCAN1051H, TCAN1051HV
TCAN1051HG, TCAN1051HGV
SLLSES8B – MARCH 2016 – REVISED MAY 2016
www.ti.com
9.4 Device Functional Modes
The device has two main operating modes: Normal mode and Silent mode. Operating mode selection is made
via the S input terminal.
Table 4. Operating Modes
S Terminal
LOW
HIGH
MODE
Normal Mode
Silent Mode
DRIVER
Enabled (ON)
Disabled (OFF)
RECEIVER
Enabled (ON)
Enabled (ON)
(1) Mirrors bus state: low if CAN bus is dominant, high if CAN bus is recessive.
RXD Terminal
Mirrors Bus State⁽¹⁾
Mirrors Bus State⁽¹⁾
9.4.1 CAN Bus States
The CAN bus has two states during powered operation of the device: dominant and recessive. A dominant bus
state is when the bus is driven differentially, corresponding to a logic low on the TXD and RXD terminal. A
recessive bus state is when the bus is biased to V_CC / 2 via the high-resistance internal input resistors R_IN of the
receiver, corresponding to a logic high on the TXD and RXD terminals.
Normal and Silent Mode
4
CANH
3
V_diff(D)
2
CANL
1
V_diff(R)
Recessive
Logic H
Dominant
Logic L
Recessive
Logic H
Time, t
Figure 13. Bus States (Physical Bit Representation)
9.4.2 Normal Mode
Select the Normal mode of device operation by setting S terminal low. The CAN driver and receiver are fully
operational and CAN communication is bi-directional. The driver translates a digital input on TXD to a differential
output on CANH and CANL. The receiver translates the differential signal from CANH and CANL to a digital
output on RXD.
9.4.3 Silent Mode
Activate Silent mode by setting S terminal high. The CAN driver is disabled, preventing communication from the
TXD pin to the CAN bus. The high speed receiver remains active so that CAN bus communication continues to
be relayed to the RXD output pin.
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