TCAN330SLASHG datasheet(21/47 Pages) TI2

21 / 47 page

space. These ensure there is a minimum recessive amount of time on the bus even if the data field contains a

high percentage of dominant bits.

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:

IOS(AVG) = %Transmit x [(%REC_Bits x IOS(SS)_REC ) + (%DOM_Bits x IOS(SS)_DOM)] + [%Receive x IOS(SS)_REC]

(1)

Where:

• IOS(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

• IOS(SS)_REC is the recessive steady state short circuit current

• IOS(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.

6.3.8 ESD Protection

The bus pins of the TCAN33x family possess on-chip ESD protection against ±25kV human body model (HBM)

and ±12kV IEC61000-4-2 contact discharge. The IEC-ESD test is far more severe than the HBM-ESD test.

The 50% higher charge capacitance, CS, and 78% lower discharge resistance, RD 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.

High-Voltage

Pulse

Generator

Device

Under

Test

Time - ns

100

150

200

250

300

10kV IEC

10kV HBM

330Ω

(1.5k)

150pF

(100pF)

50M

(1M)

Figure 6-2. HBM and IEC-ESD Models and Currents in Comparison (HBM Values in Parenthesis)

6.3.9 Digital Inputs and Outputs

All the devices in this family are single 3.3V nominal supply devices. The digital logic input and output levels for

these devices have TTL threshold levels.

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TCAN330, TCAN332, TCAN334, TCAN337

TCAN330G, TCAN332G, TCAN334G, TCAN337G

SLLSEQ7F – DECEMBER 2015 – REVISED MAY 2025

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