Hardware Description
5
SLLU221 – October 2016
Copyright © 2016, Texas Instruments Incorporated
SN65DSI83, SN65DSI84, and SN65DSI85 EVM User’s Manual and
Implementation Guide
the backlight power and its related signals. XC connections are open vias, in case there is a need to
connect to other signals. The mating connector part number is QTH-020-01-H-D-DP-A. For an SMA-
type connection, use the Samtec HDR-128291-XX breakout board. The HDR-128291-XX is a breakout
board with a mating connector to J6 and standard SMA male connectors via cables. More information
on this breakout board is provided upon request.
(B)
J2 and J5 – I-PEX-type connectors (P/N 20455-040E-12)
J2 and J5 are I-PEX connectors widely used in LCD video panels with LVDS receivers. Connect J2
and J5 via an SGC-type cable with one-to-one pin mapping to a panel using the I-PEX20455-040E-12
connectors. J2 connects to the LVDS Ch A signals while J5 connects to the LVDS CHB signals.
2.3
I
2
C
Access to I
2
C signals are provided via DSI input connectors J1 and J4 (as mentioned in
) or
J10. Note that I
2
C signal levels should be at 1.8 V when the I
2
C interface is accessed through connectors
J1 or J4. A 3.3-V to 1.8-V voltage translation is provided when an I
2
C host is connected through J10.
A stand-alone external I
2
C host can be connected via J10 to debug.
2.4
Enable or Reset
There are three device enable or reset options to use with the EVM:
(A)
Supervisor circuitry option
This is a default configuration. The enable (EN) signal is held low until the power good (PG) from the
1.8-V voltage regulator reaches a stable high voltage level, then it is released high.
(B)
RC timing option
The C10 external capacitor and internal resistor are used to control the EN ramp time after the device
is powered on. C10 is a DNI (Do Not Install option), by default. C10 needs to be installed and R52
needs to be uninstalled to enable this option.
(C)
External control option
A push button (SW1) or a DIP switch (SW2.3) is available for the manual control of the EN signal.
Install R64 to enable the DIP switch option.
2.5
Power
A 5- to 6-V power supply will operate the SN65DSI8X EVM. A plug to accept a 5- to 6-V wall power
adapter is provided on the EVM (J13). The jumper on position 1-2 of J15 should be placed while J14 is
left open. This should be the default configuration when the board is shipped.
The EVM is designed to accommodate up to maximum of 1.5 A current. The current consumption of
the board without backlight driver enabled is about 70 mA + SN65DSI85 device power. The
SN65DSI85 consumes about 50 mA at power on, approximately 80 mA to approximately 200 mA,
depending on the system configuration. The total power consumption of the board could vary
depending on LCD panels when the on-board backlight driver is used. When an LCD panel consumes
more current than 1.5 A minus 70 mA + SN65DSI85 device power, an external backlight source should
be used.
NOTE:
Do not plug in any power source higher than the configured voltage (5 V or 6 V).
2.6
Backlight Driver
The SN65DSI8X EVM incorporates the LED backlight driver circuitry using the TI backlight driver device
TPS61181A enabling use of the on-board backlight driver source. The default configuration of the EVM
enables the on-board backlight driver.
If the external backlight driver is used, a connection is available via J3. Uninstall FB6 if external backlight
driver is used.