Exar SP336E Manuale utente

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.

Board Layout

Figure 1 – Evaluation Board Layout

Table 1

TEST POINT

WHERE

DEVICE

PAIR TEST POINT

SIGNAL

TP32

T1_IN

U6-26

TP44

GND

TP31

T2_IN

U6-27

TP43

GND

TP30

T3_IN

U6-28

TP42

GND

TP14

T4_IN

U6-1

TP8

GND

TP36

R1_OUT

U6-19

TP48

GND

TP35

R2_OUT

U6-20

TP50

GND

TP34

R3_OUT

U6-21

TP45

GND

TP33

R4_OUT

U6-22

TP41

GND

TP17

T1_OUT

U6-6

TP11

GND

TP18

T2_OUT

U6-7

TP12

GND

TP16

T3_OUT

U6-4

TP10

GND

TP15

T4_OUT

U6-3

TP9

GND

TP40

R1_IN

U6-15

TP47

GND

TP39

R2_IN

U6-16

TP51

GND

TP38

R3_IN

U6-17

TP49

GND

TP37

R3_IN

U6-18

TP46

GND

TP27, TP26

VCC

U6-5

TP28, TP29

GND

U6-8

TP24

V+

U6-10 (C3)

TP22 (C3)

TP25

V-

U6-14 (C4)

TP23 (C4)

J1-2 & J2-2

VCC

Board

VCC

TP53, TP54, TP54, & TP56

GND

Board

GND

J3-2 & J4-2

GND

Board

GND

Table 2

Resistor

Header

Device

Mode Selected

R10

U6-6&7

Mode 100

R11

U6-3&4

Mode 010 & 100

R16

U6-15&16

Mode 101

R17

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

RXout

Txout & Rxin High

Impedance

RS-232 Mode

4T/4R RS232 Mode

Mixed Protocol, Half

Duplex

2T/2R RS232 Mode &

1T/1R RS-485

Mixed Protocol, Full

Duplex

2T/2R RS232 Mode &

1T/1R RS-485

RS-485/422 Half Duplex

2T/2R RS-485

RS-485/422 Full Duplex

2T/2R RS-485

Low Power, 4Rx Active

Driver at High

Impedance

Low Power Shutdown

All I/O at High

Impedance

RS-232 at 250kbps

RS-485 at 250Kbps

RS-232 at 1Mbps

RS-485 at 10Mbps

Note: Mode set for zero, SW3 to the Right

Mode set for one, SW3 to the Left

Using the SP336 Evaluation Board

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). The driver and receiver electrical

characteristics and the pin functions change depending on the mode selected.

Figure 1- Mode Configuration

Table 2 is a matrix describing all the possible modes for the SP366 and lists the jumper settings

for each mode. The Driver inputs, SLEW, MODE and the Loop back are all define an operating

mode. The modes are listed in the first column. The inputs to T1_In (TP32 & TP44), T2_In (TP31

& TP43), T3_In (TP30 & TP42) and T4_In (TP14 & TP8) can be made using the 50 Ohm

terminated resistor. Set the SP336 for the mode to be tested. Channels can also be connected

high or low individually by the test points mention above and reference in 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” (Right) limits the driver slew rate.

Local loop back diagnostic mode for RS232 is provided “on chip” by using logic programmable

mode 000. Local loop back testing for RS485/422 mode is also provided on the evaluation board

and can be implemented using the headers (Sw3-1 is Mode 0, SW3-2 is Mode 1 & SW3-3 is

Mode 2). Set mode input logic to 101 to define RS485/422 mode. Follow Table 4 and jumper

from test point to test point to Loopback.

Reference to Table 4:

Table 4

Device

Signal

Device

Signal

U6-6

T1_out TP17

U6-15

R1_in TP40

U6-7

T2_out TP21

U6-16

R2_in TP39

U6-4

T1_out TP16

U6-17

R3_in TP38

U6-3

T1_out TP15

U6-18

R4_in TP37

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 – Pin Descriptions

Pin Functions

Name

Type

Single Ended

Full-Duplex

Half-Duplex

T4_In

TTL Input

T4 Driver Input

T3 Driver Enable

Active High

T3 Driver Enable

Active High, R3

Enable Active Low

Mode_1

TTL Input

Mode configuration pin 1

T4_Out

Bus Driver

T4 Driver

Output

T3(A) Output

T3_Out

Bus Driver

T3 Driver

Output

T3(B) Output

Vcc

Supply

Power Supply Voltage

T1_Out

Bus Driver

T1 Driver

Output

T1(A) Output

T2_Out

Bus Driver

T2 Driver

Output

T1(B) Output

GND

Supply

Ground

C1+

Pump

Positive terminal of positive flying capacitor

V+

Pump

Vdd of charge pump

C2+

Pump

Positive terminal of negative flying capacitor

C1-

Pump

Negative terminal of positive flying capacitor

C2-

Pump

Negative terminal of negative flying capacitor

V-

Pump

Vss of charge pump

R1_In

Bus Receiver

R1 Receiver

Input

R1(A) Receiver Input

Tri-State

R2_In

Bus Receiver

R2 Receiver

Input

R1(B) Receiver Input

R3_In

Bus Receiver

R3 Receiver

Input

R3(A) Receiver Input

Tri-State

R4_In

Bus Receiver

R4 Receiver

Input

R3(B) Receiver Input

R1_Out

TTL Output

Receiver 1 Output

R2_Out

TTL Output

Receiver 2 Output

R3_Out

TTL Output

Receiver 3 Output

R4_Out

TTL Input

Receiver 4 Output

Mode_2

TTL Input

Mode configuration pin 2

Mode_0

TTL Input

Mode configuration pin 0

SLEW

TTL Input

Slew Rate Control. Logic low input will limit driver slew from

either RS-232 or RS-485 to 250kbps

T1_In

TTL Input

T1 Driver Input

T2_In

TTL Input

T2 Driver Input

or T1 Driver

Enable

T1 Driver Enable

Active High

T1 Driver Enable

Active High, R1

Enable Active Low

T3_In

TTL Input

T3 Driver Input

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