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Exar SP336E Manual

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SP336E Evaluation Board Manual
11-23-10
Rev 2.1
Features
• Easy Evaluation of the SP336E Transceiver
• RS-232 and RS-485 Protocols
• Local or Remote Loop Back testing
• 10Mbps Differential Transmission Rates
• Test point for cable or jumper loop-back
Description
The SP336 Evaluation Board is designed to analyze the SP336 multi-protocol transceiver.
The evaluation board provides access points to all of the driver and receiver I/O pins so that the
user can measure electrical characteristics and waveforms of each signal. The evaluation board
also has a switch to allow the user to select the mode of operation and slew control.
Furthermore, the SP336 Evaluation Board provides the means to test both local and remote
driver/receiver loop-back.
This Manual is split into sections to give the user the information necessary to perform a
thorough evaluation of the SP336. The "Layout" section describes the I/O pins, jumpers and the
other components used on the evaluation board. The layout diagram is also covered. The "Using
the SP336 Evaluation Board" section details the configuration of the SP336 evaluation board for
parametric testing.

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Summary of Contents for Exar SP336E

  • Page 1 SP336E Evaluation Board Manual 11-23-10 Rev 2.1 Features • Easy Evaluation of the SP336E Transceiver • RS-232 and RS-485 Protocols • Local or Remote Loop Back testing • 10Mbps Differential Transmission Rates • Test point for cable or jumper loop-back Description The SP336 Evaluation Board is designed to analyze the SP336 multi-protocol transceiver.

  • Page 2: Board Layout

    Board Layout Figure 1 – Evaluation Board Layout Table 1 TEST POINT WHERE DEVICE PAIR TEST POINT SIGNAL TP32 T1_IN U6-26 TP44 TP31 T2_IN U6-27 TP43 TP30 T3_IN U6-28 TP42 TP14 T4_IN U6-1 TP36 R1_OUT U6-19 TP48 TP35 R2_OUT U6-20 TP50 TP34 R3_OUT...
  • Page 3 Table 2 Resistor Header Device Mode Selected U6-6&7 Mode 100 U6-3&4 Mode 010 & 100 U6-15&16 Mode 101 U6-17&18 Mode 011 & 101 Table 3 SW3-1 SW3-2 SW3-3 SW3- MODE_0 MODE_1 MODE_3 SLEW Loopback TXin to Txout & Rxin High RXout Impedance RS-232 Mode...

  • Page 4: Mode Configuration

    The SP336 uses a 3 bit decoder to define the protocol selected. The mode selection truth table is shown in the data sheet and in Table 3. The SP336E supports eight distinct operating modes. Modes are set using the three Mode-Configuration input pins M0, M1, and M2, which correspond to SW3 (to the right is zero and to the left is one).
  • Page 6 Table 1. Slew rate control for the SP336E drivers is logic selectable using the SLEW pin which is connected to SW3-4 “1”. Connecting SW3-4 (Left) provides high speed and no slew limiting while SW3-4 “0”...

  • Page 7: Pin Functions

    Refer to Table 1 for the desired inputs and outputs for loading. Loading the receiver outputs can be done thru test points on Table 4. Remember that the receiver acts as one load when connected to a driver output in a loop back configuration. Table 5 –...