Exar SP336E User Manual
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.
2
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
3
Table 2
Resistor
Header
Device
Mode Selected
R10
J7
U6-6&7
Mode 100
R11
J6
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
SW34
MODE_0
MODE_1
MODE_3
SLEW
0 0 0
x
Loopback TXin to
RXout
Txout & Rxin High
Impedance
0 0 1
x
RS-232 Mode
4T/4R RS232 Mode
0 1 0
x
Mixed Protocol, Half
Duplex
2T/2R RS232 Mode &
1T/1R RS-485
0 1 1
x
Mixed Protocol, Full
Duplex
2T/2R RS232 Mode &
1T/1R RS-485
1 0 0
x
RS-485/422 Half Duplex
2T/2R RS-485
1 0 1
x
RS-485/422 Full Duplex
2T/2R RS-485
1 1 0
x
Low Power, 4Rx Active
Driver at High
Impedance
1 1 1
x
Low Power Shutdown
All I/O at High
Impedance
x x x
0
RS-232 at 250kbps
RS-485 at 250Kbps
x x x
1
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
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