TCAN330_16 Datasheet, PDF (21/40 Pages) Texas Instruments – 3.3-V CAN Transceivers with CAN FD (Flexible Data Rate)

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TCAN330, TCAN332, TCAN334, TCAN337
TCAN330G, TCAN332G, TCAN334G, TCAN337G
SLLSEQ7D – DECEMBER 2015 – REVISED APRIL 2016
The short circuit current of the bus depends on the ratio of recessive to dominant bits and their respective short
circuit currents. The average short circuit current may be calculated with the following formula:
I_OS(AVG) = %Transmit x [(%REC_Bits x I_{OS(SS)_REC} ) + (%DOM_Bits x I_{OS(SS)_DOM})] + [%Receive x I_{OS(SS)_REC}]
(1)
Where:
• I_OS(AVG) is the average short circuit current
• %Transmit is the percentage the node is transmitting CAN messages
• %Receive is the percentage the node is receiving CAN messages
• %REC_Bits is the percentage of recessive bits in the transmitted CAN messages
• %DOM_Bits is the percentage of dominant bits in the transmitted CAN messages
• I_{OS(SS)_REC} is the recessive steady state short circuit current
• I_{OS(SS)_DOM} is the dominant steady state short circuit current
The short circuit current and possible fault cases of the network should be taken into consideration when sizing
the power ratings of the termination resistance and other network components.
10.3.8 ESD Protection
The bus pins of the TCAN33x family possess on-chip ESD protection against ±25-kV human body model (HBM)
and ±12-kV IEC61000-4-2 contact discharge. The IEC-ESD test is far more severe than the HBM-ESD test. The
50% higher charge capacitance, C_S, and 78% lower discharge resistance, R_D of the IEC model produce
significantly higher discharge currents than the HBM-model.
As stated in the IEC 61000-4-2 standard, contact discharge is the preferred test method; although IEC air-gap
testing is less repeatable than contact testing, air discharge protection levels are inferred from the contact
discharge test results.
R_C
High-Voltage
Pulse
Generator
50M
(1M)
C_S
R_D
330Ω
(1.5k)
150pF
(100pF)
Device
Under
Test
40
35
30 _{10kV IEC}
25
20
15
10
5
10kV HBM
0
0 50 100 150 200 250 300
Time - ns
Figure 30. HBM and IEC-ESD Models and Currents in Comparison (HBM Values in Parenthesis)
10.3.9 Digital Inputs and Outputs
All the devices in this family are single 3.3-V nominal supply devices. The digital logic input and output levels for
these devices have TTL threshold levels.
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