High Speed Mode

4.3.2.2 Signal Voltage Level in High Speed Mode

Measure the CAN bus output signal voltage levels in high-speed mode under the complete battery power voltage range of (9.0 to 16.0) V. Check if the levels meet the requirements

Set the supply voltage of the DUT to 9.0 V. Increase the battery voltage in steps of 1.0 V per minute. Measure the absolute voltage level on the CAN Bus line for each battery voltage.

Verify Voh

AcceptanceCriteria:

Voh should be below range

Min       3.9v

Typical  4.65v

Max       5.1v

Signal Vtg Lvl in HS Mode 9V

Measure the absolute voltage level on the CAN Bus line for 9.0 V

Verify Voh

AcceptanceCriteria:

Voh should be below range

3.9 V £ Voh  £ 5.1 V

Signal Vtg Lvl in HS Mode 10V

Measure the absolute voltage level on the CAN Bus line for 10.0 V

Verify Voh

AcceptanceCriteria:

Voh should be below range

3.9 V £ Voh  £ 5.1 V

Signal Vtg Lvl in HS Mode 11V

Measure the absolute voltage level on the CAN Bus line for 11.0 V

Verify Voh

AcceptanceCriteria:

Voh should be below range

3.9 V £ Voh  £ 5.1 V

Signal Vtg Lvl in HS Mode 12V

Measure the absolute voltage level on the CAN Bus line for 12.0 V

Verify Voh

AcceptanceCriteria:

Voh should be below range

3.9 V £ Voh  £ 5.1 V

Signal Vtg Lvl in HS Mode 13V

Measure the absolute voltage level on the CAN Bus line for 13.0 V

Verify Voh

AcceptanceCriteria:

Voh should be below range

3.9 V £ Voh  £ 5.1 V

Signal Vtg Lvl in HS Mode 14V

Measure the absolute voltage level on the CAN Bus line for 14.0 V

Verify Voh

AcceptanceCriteria:

Voh should be below range

3.9 V £ Voh  £ 5.1 V

Signal Vtg Lvl in HS Mode 15V

Measure the absolute voltage level on the CAN Bus line for 15.0 V

Verify Voh

AcceptanceCriteria:

Voh should be below range

3.9 V £ Voh  £ 5.1 V

Signal Vtg Lvl in HS Mode 16V

Measure the absolute voltage level on the CAN Bus line for 16.0 V

Verify Voh

AcceptanceCriteria:

Voh should be below range

3.9 V £ Voh  £ 5.1 V

4.3.3.2 Recessive or Passive State Low Voltage in High Speed Mode.

Measure the CAN bus output signal voltage levels in high-speed mode under the complete battery power voltage range (9.0 to 16.0) V. Check whether the voltage levels meet the requirements

Set the supply voltage of the DUT to 9.0 V. Increase the battery voltage in steps of 1.0 V per minute. Measure the recessive voltage level on the CAN Bus line for each battery voltage.

Verify Vleaknorm

AcceptanceCriteria:

Vleaknorm should be below range

-0.2 V £ Vleaknorm £ 0.2 V

Rec or Passive State Low Vtg in HS Mode 9V

Measure the absolute voltage level on the CAN Bus line for 9.0 V

Verify Vleaknorm

AcceptanceCriteria:

Vleaknorm should be below range

-0.2 V £ Vleaknorm £ 0.2 V

Rec or Passive State Low Vtg in HS Mode 10V

Measure the absolute voltage level on the CAN Bus line for 10.0 V

Verify Vleaknorm

AcceptanceCriteria:

Vleaknorm should be below range

-0.2 V £ Vleaknorm £ 0.2 V

Rec or Passive State Low Vtg in HS Mode 11V

Measure the absolute voltage level on the CAN Bus line for 11.0 V

Verify Vleaknorm

AcceptanceCriteria:

Vleaknorm should be below range

-0.2 V £ Vleaknorm £ 0.2 V

Rec or Passive State Low Vtg in HS Mode 12V

Measure the absolute voltage level on the CAN Bus line for 12.0 V

Verify Vleaknorm

AcceptanceCriteria:

Vleaknorm should be below range

-0.2 V £ Vleaknorm £ 0.2 V

Rec or Passive State Low Vtg in HS Mode 13V

Measure the absolute voltage level on the CAN Bus line for 13.0 V

Verify Vleaknorm

AcceptanceCriteria:

Vleaknorm should be below range

-0.2 V £ Vleaknorm £ 0.2 V

Rec or Passive State Low Vtg in HS Mode 14V

Measure the absolute voltage level on the CAN Bus line for 14.0 V

Verify Vleaknorm

AcceptanceCriteria:

Vleaknorm should be below range

-0.2 V £ Vleaknorm £ 0.2 V

Rec or Passive State Low Vtg in HS Mode 15V

Measure the absolute voltage level on the CAN Bus line for 15.0 V

Verify Vleaknorm

AcceptanceCriteria:

Vleaknorm should be below range

-0.2 V £ Vleaknorm £ 0.2 V

Rec or Passive State Low Vtg in HS Mode 16V

Measure the absolute voltage level on the CAN Bus line for 16.0 V

Verify Vleaknorm

AcceptanceCriteria:

Vleaknorm should be below range

-0.2 V £ Vleaknorm £ 0.2 V

4.3.7 Signal Rise Fall Time

Measure the signal rise and fall times under the given conditions with an oscilloscope

Perform this measurement at least 1000 times per edge to determine the minimum and

maximum values of the rise/fall times

Verify Rise Time , Fall Time

Acceptance Criteria:

                     Minimum                   Maximum

Risetime          75ns                         1.28μs

Fall Time          30ns                         2.25 μs

4.3.7.1.1.1 Signal Rise Fall time Min Ld at Min Tau

Measure the signal rise and fall times for Min Ld Min Tau

Verify Rise Time , Fall Time

Acceptance Criteria:

                     Minimum                   Maximum

Risetime          75ns                         1.28μs

Fall Time          30ns                         2.25 μs

Signal Rise Fall time Min Ld at Max Tau

Measure the signal rise and fall times for Min Ld Miax Tau

Verify Rise Time , Fall Time

Acceptance Criteria:

                     Minimum                   Maximum

Risetime          75ns                         1.28μs

Fall Time          30ns                         2.25 μs

4.3.7.1.1.2 Signal Rise Fall time Max Ld at Min Tau

Measure the signal rise and fall times for Max Ld Min Tau

Verify Rise Time , Fall Time

Acceptance Criteria:

                     Minimum                   Maximum

Risetime          75ns                         1.28μs

Fall Time          30ns                         2.25 μs

Signal Rise Fall time Max Ld at Max Tau

Measure the signal rise and fall times for Max Ld Max Tau

Verify Rise Time , Fall Time

Acceptance Criteria:

                     Minimum                   Maximum

Risetime          75ns                         1.28μs

Fall Time          30ns                         2.25 μs

4.3.9 Signal Characteristics

All wire length shall be < 1.0 m. The signals are measured under maximum and minimum physical load conditions

Measure the signal shapes under the given conditions with an oscilloscope

Acceptance Criteria:

In the first half of the bit time, the bus output level shall not drop below 81 % of the DC-value.

In the second half of the bit time, the bus output level shall be in the range of (95 to 105) % of the DC-value.

4.3.9.3.1 Signal Char Min Ld Min Tau

Measure the signal shapes for Min Ld Min Tau

Acceptance Criteria:

In the first half of the bit time, the bus output level shall not drop below 81 % of the DC-value.

In the second half of the bit time, the bus output level shall be in the range of (95 to 105) % of the DC-value.

Signal Char Min Ld Max Tau

Measure the signal shapes for Min Ld Max Tau

Acceptance Criteria:

In the first half of the bit time, the bus output level shall not drop below 81 % of the DC-value.

In the second half of the bit time, the bus output level shall be in the range of (95 to 105) % of the DC-value.

4.3.9.3.2 Signal Char Max Ld Min Tau

Measure the signal shapes for Max Ld Min Tau

Acceptance Criteria:

In the first half of the bit time, the bus output level shall not drop below 81 % of the DC-value.

In the second half of the bit time, the bus output level shall be in the range of (95 to 105) % of the DC-value.

Signal Char Max Ld Max Tau

Measure the signal shapes for Max Ld Max Tau

Acceptance Criteria:

In the first half of the bit time, the bus output level shall not drop below 81 % of the DC-value.

In the second half of the bit time, the bus output level shall be in the range of (95 to 105) % of the DC-value.

4.3.10.1 Tolerance of CAN Bit Time

Measure the bit time under the combinations of given conditions.

Choose a DUT message, and then measure the bit time between the recessive-to-dominant edges of the slopes of at least 20 consecutive bits and calculate the bit time of a single bit.

Acceptance Criteria:

The maximum bit time deviation shall be ± 0.35 % of the nominal bit time.

4.3.10.1.3.1 Tol of CAN Bit Min Ld Min Tau

Measure the bit time for Min Ld Min Tau

Acceptance Criteria:

The maximum bit time deviation shall be ± 0.35 % of the nominal bit time.

4.3.10.1.3.2 Tol of CAN Bit Min Ld Max Tau

Measure the bit time for Min Ld Max Tau

Acceptance Criteria:

The maximum bit time deviation shall be ± 0.35 % of the nominal bit time.

4.3.10.1.3.3 Tol of CAN Bit Max Ld Min Tau

Measure the bit time for Max Ld Min Tau

Acceptance Criteria:

The maximum bit time deviation shall be ± 0.35 % of the nominal bit time.

4.3.10.1.3.4 Tol of CAN Bit Max Ld Max Tau

Measure the bit time for Max Ld Max Tau

Acceptance Criteria:

The maximum bit time deviation shall be ± 0.35 % of the nominal bit time.