Texas Instruments | TUSB211 to TUSB212 Changes | Application notes | Texas Instruments TUSB211 to TUSB212 Changes Application notes

Texas Instruments TUSB211 to TUSB212 Changes Application notes
Application Report
SLLA376 – September 2017
TUSB211 to TUSB212 Changes
ABSTRACT
This document defines pinout differences between the TUSB211 and the TUSB212 and highlights the
schematic changes needed to convert existing system designs from using the TUSB211 to the TUSB212.
This document also applies to the TUSB214 which shares the same pinout and pin functions of the
TUSB212.
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Contents
Pinout Comparison ..........................................................................................................
VCC and GND ...............................................................................................................
USB Data Pins ...............................................................................................................
RSTN, EQ, and VREG Pins ................................................................................................
Test and CD Pins ............................................................................................................
DC_BOOST/ENA_HS .......................................................................................................
Reference Schematic .......................................................................................................
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List of Figures
1
Reference Schematic
.......................................................................................................
3
List of Tables
1
TUSB211 to TUSB212 Pinout Changes .................................................................................. 2
2
TUSB212 Equalization Control Pin Settings ............................................................................. 2
3
TUSB212 DC_BOOST Control Pin Settings ............................................................................. 3
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1
Pinout Comparison
1
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Pinout Comparison
Table 1 lists the changes in the pin definitions of the TUSB211 and TUSB212 devices, and highlights pin
configurations that may require change when using the TUSB212 to replace the TUSB211 in an existing
system.
Table 1. TUSB211 to TUSB212 Pinout Changes
Pin
TUSB211
TUSB212
1
D1M
D1M
No change required
TUSB211 to TUSB212 Change Notes
2
D1P
D1P
No change required
3
TEST
SDA
4
CD
SCL/CD
5
RSTN
RSTN
No change required
6
EQ
EQ
No change required
GPIO mode: no change required
I2C mode: add a 4.7-k pullup to VCC; connect to
master SCL.
No change required
2
I2C mode: add a 4.7-k pulup to VCC; connect to
master SDA.
7
D2P
D2P
No change required
8
D2M
D2M
No change required
9
ENA_HS
DC_BOOST/ENA_HS
43-k pullup to VCC for high boost
Leave floating for mid boost
43-k pulldown to GND for low boost
10
GND
GND
No change required
11
VREG
VREG
No change required
12
VCC
VCC
No change required
VCC and GND
No changes are required for VCC and GND pins.
3
USB Data Pins
No changes are required for D1P, D1M, D2P, or D2M pins.
4
RSTN, EQ, and VREG Pins
No changes are required for RSTN, EQ, or VREG pins.
Table 2. TUSB212 Equalization Control Pin Settings
Pin
EQ
2
Description
AC Boost
AC Boost Level
Typical Pulldown Resistor
Value
0
100 Ω
1
1.7 kΩ
2
3.8 kΩ
3
10 kΩ
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Test and CD Pins
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5
Test and CD Pins
The Test and CD pins have changed from the TUSB211 to the TUSB212, these pins are dual-function
pins in the TUSB212 for the I2C interface. If the TUSB212 is not configured to use I2C, then there are no
changes needed for these pins. If the TUSB212 is configured to use I2C, the Test pin acts as the I2C SDA
pin and CD acts as the I2C SCL pin. Both SDA and SCL should have a 4.7-kΩ pullup to VCC.
6
DC_BOOST/ENA_HS
The DC_BOOST pin was added to the TUSB212, this pin is muxed with the ENA_HS pin. The state of the
DC_BOOST pin is sampled after Power-On Reset or de-assertion of the RSTN pin and selects the
amount of DC Boost added to the differential signal. After the DC_BOOST input is sampled, the pin
function changes to being the ENA_HS output signal.
Table 3. TUSB212 DC_BOOST Control Pin Settings
Pin
Description
DC_BOOST/ENA_HS
7
Logic State
Boost Setting
Low
Low boost (40 mV)
DC Boost
Floating
Mid boost (60 mV)
High
High boost (80 mV)
Reference Schematic
Figure 1 can be referenced for a dual design using the TUSB211 or TUSB212. Resistor REQ selects the
AC Boost configuration, resistors RDC1 and RDC2 select the DC_BOOST configuration (can be left
unpopulated for TUSB211). Please refer to the appropriate data sheet for complete pin configuration
information.
+3.3 V
1 µF
+3.3 V
REQ
EQ
RDC2
100 nF
100 nF
RSTN
RDC1
SCL/CD
VCC
USB Receptacle
USB_DP
USB_DN
DC_BOOST/ENA_HS
SDA
D2P
D1P
D2M
D1N
GND
USB_DP
USB_DN
USB
Host or Hub
VREG
100 nF
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Figure 1. Reference Schematic
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Revision History
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Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
4
Date
Revision
Description
September 2017
*
Initial release
Revision History
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