TCAN1042-Q1 Datasheet, PDF (18/32 Pages) Texas Instruments – Automotive Fault Protected CAN Tranceiver

TCAN1042-Q1, TCAN1042V-Q1, TCAN1042H-Q1
TCAN1042HV-Q1, TCAN1042G-Q1, TCAN1042GV-Q1
TCAN1042HG-Q1, TCAN1042HGV-Q1
SLLSES9 – FEBRUARY 2016
www.ti.com
9.4 Device Functional Modes
The device has two main operating modes: normal mode and standby mode. Operating mode selection is made
via the STB input terminal.
Table 4. Operating Modes
STB Terminal
LOW
HIGH
MODE
Normal Mode
Standby Mode
DRIVER
Enabled (ON)
Disabled (OFF)
RECEIVER
Enabled (ON)
Disabled (OFF) (Low
Power Bus Monitor is
Active)
(1) Mirrors bus state: low if CAN bus is dominant, high if CAN bus is recessive.
RXD Terminal
Mirrors Bus State⁽¹⁾
High (Unless valid WUP
has been received)
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. See Figure 13 and Figure 14.
Normal & Silent Mode
4
CANH
3
V_diff(D)
2
CANL
1
V_diff(R)
Recessive Dominant Recessive
Logic H Logic L Logic H
Time, t
Figure 13. Bus States (Physical Bit Representation)
Figure 14. Bias Unit (Recessive Common Mode Bias) and Receiver
18
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Product Folder Links: TCAN1042-Q1 TCAN1042V-Q1 TCAN1042H-Q1 TCAN1042HV-Q1 TCAN1042G-Q1
TCAN1042GV-Q1 TCAN1042HG-Q1 TCAN1042HGV-Q1