Introduction
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2
SLVUAU3 – January 2017
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Copyright © 2017, Texas Instruments Incorporated
TPD2S701-Q1 Evaluation Module
1
Introduction
Texas Instrument’s TPD2S701-Q1 evaluation module helps designers evaluate the operation and
performance of the TPD2S701-Q1 device. The TPD2S701-Q1 contains two data line nFET switches which
ensure safe data communication while protecting the internal system circuits from any over-voltage
conditions at the VD+ and VD– pins. See
Figure 1
. On these pins, this device can handle over-voltage
protection up to 18-V DC. This provides sufficient protection for shorting the data lines to the car battery
as well as the USB VBUS rail. This EVM allows the user to evaluate the operation of this device in a pass-
through application, as well as to measure the ESD response and bandwidth of the device. In addition,
this EVM offer, contains the device in both the DSK and DGS package offering, so that the device can be
evaluated regardless of the preferred package option.
Figure 1. TPD2S701-Q1 EVM
2
Board Setup
The TPD2S701-Q1 EVM consists of 5 devices allowing for three different test setups.
2.1
Device Information
To power the EVM, apply 5 V to the pin labeled '+5V' on the EVM. If the user is testing a device in Mode
0, they will need to apply an additional voltage to the pin labeled 'Vref', but if testing is done in Mode 1
then the 'Vref' pin can be left unused. The functional devices modes are discussed in greater depth later,
but for detailed information see the device data sheet.
Each TPD2S701-Q1 in this EVM contains headers for enabling the device and a mode switch to enable
each mode of operation. Before using any of the devices, ensure that the particular device has a header
between the center pin and the pin labeled 'On' for the corresponding set of pins. It is recommended that
any devices not currently in use be disabled by moving the header between the center pin and the 'Off'
pin.
In addition, the EVM allows testing of each device in either functional mode 0 or functional mode 1 by
moving the switch corresponding to the device. The functional mode changes how the overvoltage set
point of the TPD2S701-Q1 is determined. In order to operate properly, the device must be power-cycled
when changing functional modes. We recommend only changing device modes while there is no power
applied to the '+5V' board power to ensure that the device works properly.
In functional mode 0 the overvoltage set point is determined by an external voltage applied to the 'Vref' pin
on the EVM. The correlation between the Vref voltage and the overvoltage set point is determined by a
formula that can be found in the device datasheet. The voltage applied to the 'Vref' pin applies to all
TPD2S701-Q1 devices on the EVM that are currently enabled and in mode 0.