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EVM Setup and Operation

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3 EVM Setup and Operation

This section describes the EVM configuration(s) required to set-up the EVM for device evaluation. The

EVM can be configured to evaluate one SN65HVD62 device individually or evaluate two of devices

simultaneously, one device acting as the transmitter and the other as the receiver. Table 4 describes the

jumper settings required for setting up U1 and U2 for various data rates during this evaluation.

Table 4. Data Rate Settings

U1 Jumper setting U2 Jumper setting

DIRSET2 DIRSET1

Data Rate

JU2 for JU3 for JU8 for JU9 for

Logic Level Logic Level

DIRSET2 DIRSET1 DIRSET2 DIRSET1

9.6kbps 0 0 Short pins 2-3 Short pins 2-3 Short pins 2- 3 Short pins 2-3

38.4kbps 0 1 Short pins 2-3 Short pins 1-2 Short pins 2-3 Short pins 1-2

115.2kbps 1 0 Short pins 1-2 Short pins 2-3 Short pins 1-2 Short pins 2-3

Standby Mode

1 1 Short pins 1-2 Short pins 1-2 Short pins 1-2 Short pins 1-2

(Receive only)

If these jumpers are left OPEN, then the internal pull-down on the DIRSET1 and DIRSET2 pins of the

device will set the open pins to logic ‘0’ level.

3.1 Equipment

The following equipment is required to perform the evaluation described in this section:

1. SN65HVD62EVM

2. Arbitrary Function Generator

3. DC Power Supply

4. Four channel Oscilloscope

3.2 Standalone Evaluation

This section covers the board configuration required to evaluate either U1 or U2 individually for either

Transmit or Receive channel parameters.

To set-up the board for standalone evaluation, refer to Table 2 for the default settings of the jumpers.

NOTE: OPEN JU13 FOR STANDALONE EVALUATION.

Table 1 indicates how each of the device pins may be accessed depending on whether U1 or U2 is

selected for evaluation. The remaining section describe the connections to required for evaluation of U1.

See Table 1 for the corresponding component connections necessary for the standalone alone evaluation

of U2.

3.2.1 Tx Channel Evaluation

This section describes the evaluation of the transmit channel of the SN65HVD62 transceiver. Adjusting the

transmit output power using different voltage settings at the RES pin is also explained.

1. From the default jumper positions as described in Table 2, open Jumper JU13 for standalone

evaluation of either U1 or U2.

2. Set the DC power supply to source 5V with 80mA current limit and connect it between TP1 (U1_VCC)

and TP2 (GND).

3. Since JU1 is shorted by default, this means that VL supply will also get 5V. In case a different supply is

required for VL, open JU1 and connect the second supply between TP3 (U1_VL) and TP4 (GND).

4. See Table 4 for data-rate settings. The board is configured by default for 115.2kbps data rate.

5. Set the waveform generator to output a square wave. Set the high and low levels to 5V (= V

) and 0V

respectively into a high-impedance load, frequency to half of the data-rate setting and duty cycle to

50%.

SN65HVD62 AISG On-Off Keying Modem Evaluation Module (EVM) SLLU152–December 2012

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