Texas Instruments | SN65LVPE502A to TUSB522P Change | Application notes | Texas Instruments SN65LVPE502A to TUSB522P Change Application notes

Texas Instruments SN65LVPE502A to TUSB522P Change Application notes
Application Report
SLLA363 – August 2016
SN65LVPE502A to TUSB522P Change Document
Undrea Fields
ABSTRACT
This document defines pinout differences between the SN65LVPE502A and the TUSB522P and highlights
possible changes needed to convert existing system designs from using the SN65LVPE502A to the
TUSB522P.
NOTE: This document also applies to the following devices: SN65LVPE502, SN65LVPE512, and
SN65LVPE502B.
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Contents
Pinout Comparison ..........................................................................................................
VCC/GND .....................................................................................................................
No Connect ...................................................................................................................
High-Speed Differential Signals ............................................................................................
Equalization (EQ) ............................................................................................................
Output Swing (OS)...........................................................................................................
De-Emphasis (DE) ...........................................................................................................
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List of Tables
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SN65LVPE502A to TUSB522P Pinout Change ......................................................................... 2
2
TUSB522P Equalization Control Pin Settings
3
SN65LVPE502A Equalization Control Pin Settings ..................................................................... 3
4
TUSB522P OS Control Pin Settings ...................................................................................... 3
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SN65LVPE502A OS Control Pin Settings ................................................................................ 3
6
TUSB522P De-Emphasis Control Pin Settings .......................................................................... 4
7
SN65LVPE502A De-Emphasis Control Pin Settings.................................................................... 4
...........................................................................
3
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SN65LVPE502A to TUSB522P Change Document
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1
Pinout Comparison
1
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Pinout Comparison
Table 1 documents the changes in the pin definitions of the SN65LVPE502A and TUSB522P devices and
highlights pin configurations that may need to change when using the TUSB522P to replace the
SN65LVPE502A in an existing system.
Table 1. SN65LVPE502A to TUSB522P Pinout Change
Pin
SN65LVPE502A
TUSB522P
1
VCC
VCC
SN65LVPE502A to TUSB522P Change Notes
No change required
2
EQ1
EQ1
Low = 3 dB, Floating = 6 dB, High = 9 dB
3
DE1
DE2
{OS = Low} Low = 0 dB, Floating = –3.5 dB, High = –6.2 dB
{OS = High} Low = –2.6 dB, Floating = –5.9 dB, High = –8.3 dB
Low(Floating) = 900 mV, High = 1200 mV
4
OS1
OS2
5
EN_RXD
EN_RXD
6
GND
NC
Can be tied to GND or left as NC
7
NC
NC
No change required
8
Host_RX1–
RX1N
Can be connected to either Host or Device
Requires Pull-up to VCC
9
Host_RX1+
RX1P
Can be connected to either Host or Device
10
GND
GND
No change required
11
Host_TX2–
TX2N
Can be connected to either Host or Device
12
Host_TX2+
TX2P
Can be connected to either Host or Device
13
VCC
VCC
No change required
14
RSVD
RSV
No change required
15
OS2
OS1
Low(Floating) = 900 mV, High = 1200 mV
16
DE2
DE1
{OS = Low} Low = 0 dB, Floating = –3.5 dB, High = –6.2 dB
{OS = High} Low = –2.6 dB, Floating = –5.9 dB, High = –8.3 dB
17
EQ2
EQ2
Low = 3 dB, Floating = 6 dB, High = 9 dB
18
GND
NC
Can be tied to GND or left as NC
19
Device_RX2+
RX2P
Can be connected to either Host or Device
20
Device_RX2–
RX2N
Can be connected to either Host or Device
21
GND
GND
No change required
22
Device_TX1+
TX1P
Can be connected to either Host or Device
23
Device_TX1+
TX1N
Can be connected to either Host or Device
24
NC
NC
No change required
No Changes Required
Possible Changes Required
Required for Normal Operation
2
SN65LVPE502A to TUSB522P Change Document
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VCC/GND
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2
VCC/GND
No changes are required for the VCC/GND pins. The TUSB522P has NC pins which are GND pins on the
SN65LVPE502A (Pins 6 and 18), these pins can also be tied to GND.
3
No Connect
No changes are required for NC pins.
4
High-Speed Differential Signals
The TUSB522P high-speed differential signals require no changes. The TUSB522P design no longer
requires dedicated pin connections for host and device as was needed for the SN65LVPE502A.
5
Equalization (EQ)
The equalization settings have changed from the SN65LVPE502A to the TUSB522P which may require
changes in the configuration of the EQ1/2 pins. For example, an EQ setting of “Low” configures the
SN65LVPE502A to use 7 dB of equalization, this same EQ setting should change to “Floating” to provide
6 dB equalization when configuring the TUSB522P. Table 2 and Table 3 show the EQ pin definitions for
the TUSB522P and SN65LVPE502A.
Table 2. TUSB522P Equalization Control Pin Settings
Pin
Description
EQ1/EQ2
Equalization Amount
Logic State
Gain (dB)
Low
3
Floating
6
High
9
Table 3. SN65LVPE502A Equalization Control Pin Settings
6
Pin
Description
Logic State
Gain (dB)
EQ1/EQ2
Equalization Amount
Low
7
Floating
0
High
15
Output Swing (OS)
The output swing settings have changed from the SN65LVPE502A to the TUSB522P which also may
require changes in the configuration of the OS1/2 pins. OS control for channels 1 and 2 are also swapped
in the TUSB522P. Table 4 and Table 5 show the OS1/2 pin definitions for the TUSB522P and the
SN65LVPE502A.
Table 4. TUSB522P OS Control Pin Settings
Pin
Description
Logic State
Transition Bit Output
Differential Voltage (mV)
OS1/2
Output Swing
Low (Floating)
900
High
1200
Table 5. SN65LVPE502A OS Control Pin Settings
Pin
Description
OS1/2
Output Swing
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Logic State
Transition Bit Output
Differential Voltage (mV)
Low
908
Floating
1042
High
1127
SN65LVPE502A to TUSB522P Change Document
Copyright © 2016, Texas Instruments Incorporated
3
De-Emphasis (DE)
7
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De-Emphasis (DE)
De-emphasis configuration settings have changed between the TUSB522P and the SN65LVPE502A. DE
control for channels 1 and 2 are also swapped in the TUSB522P. These changes may require
configuration changes when moving from the SN65LVPE502A to the TUSB522P. Table 6 and Table 7
show the DE pin definitions for the TUSB522P and the SN65LVPE502A.
Table 6. TUSB522P De-Emphasis Control Pin Settings
Pin
Description
Logic State
De-Emphasis Ratio (dB)
OS = Low(Floating)
OS = High
DE1/2
De-Emphasis Amount
Low
0
–2.6
Floating
–3.5
–5.9
High
–6.2
–8.3
Table 7. SN65LVPE502A De-Emphasis Control Pin Settings
Pin
DE1/2
4
Description
Logic State
De-Emphasis
Amount
De-Emphasis Ratio (dB)
OS = Floating
OS = Low
OS = High
–4.4
Low
–3.5
–2.2
Floating
0
0
0
High
–6.0
–5.2
–6.0
SN65LVPE502A to TUSB522P Change Document
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