Adafruit TFP401 HDMI/DVI Decoder to 40-pin TTL Display
Created by lady ada
Last updated on 2018-08-22 03:44:43 PM UTC
Guide Contents
Guide Contents
Overview
Touch Screen
Backlight
Editing the EDID
Downloads
Datasheets & Files
Schematics
Fabrication Print
Raspberry Pi Config
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© Adafruit Industries
https://learn.adafruit.com/adafruit-tfp401-hdmi-slash-dvi-decoder-to-40-pin-ttl-display
Page 2 of 19
Overview
Its a mini HDMI decoder board! So small and simple, you can use this board as an all-in-one display driver for TTL
displays, or perhaps decoding HDMI/DVI video for some other project. This breakout features the TFP401 for decoding
video, and for the touch version, an AR1100 USB resistive touch screen driver.
The TFP401 is a beefy DVI/HDMI decoder from TI. It can take unencrypted video and pipe out the raw 24-bit color pixel
data - HDCP not supported! It will decode any resolution from 25-165MHz pixel clock, basically up to 1080p. We've
used this breakout with 800x480 displays, so we have not specifically tested it with higher resolutions. We added a
bunch of supporting circuitry like a backlight driver and configured it for running basic TTL display panels such as the
ones we have in the shop
© Adafruit Industries
https://learn.adafruit.com/adafruit-tfp401-hdmi-slash-dvi-decoder-to-40-pin-ttl-display
Page 3 of 19
You can even power the display and decoder from a USB port. For example, with a 5" 800x480 display and 50mA
backlight current, the current draw is 500mA total. You can reduce that down 370mA by running the backlight at half-
brightness (25mA). With the backlight off, the decoder and display itself draws 250mA. If you want more backlight
control, there's a PWM input, connect that to your microcontroller or other PWM output and you can continuously dim
the backlight as desired
We have two versions, one is video only and one is video+touch. If you want a screen that you can poke at, get the
+touch version and pair it with a screen that has a resistive touch overlay. The USB port then acts as both power and
data, with the touch screen appearing like a USB mouse.
This driver is designed specifically as a small and easy to use display driver for our 40-pin TTL displays. In particular,
we suggest it for use with single board computers (or desktop/laptops!) with DVI/HDMI output like the Raspberry Pi or
BeagleBone Black. You can power the driver over USB and then feed it video via the HDMI port. It's a very small board
so great for tucking into an enclosure. It can drive our 4.3", 5.0" or 7.0" displays but we really only recommend the 5"
or 7" 800x480 as some computers do not like the low resolution of the 4.3" and the TFP401 does not contain a video
scaler, it will not resize/shrink video!
© Adafruit Industries
https://learn.adafruit.com/adafruit-tfp401-hdmi-slash-dvi-decoder-to-40-pin-ttl-display
Page 4 of 19
We ship this board with an 800x480 resolution EDID so it will be auto-detected at that resolution. For advanced users,
the EDID can be reprogrammed using our example Arduino code. Or, for computers that use linux, you can always just
force the resolution to whatever display you have connected.
This is just a decoder breakout, a display is not included! We recommend either the 800x480
5" with
touch
(http://adafru.it/1596),
5" without touch
(http://adafru.it/1680),
7" with touch
(http://adafru.it/2354)
or
7" without
touch
(http://adafru.it/2353)
Please check out the detailed tutorial on adjusting the backlight brightness. We also have information on how to tweak
the EDID if you want to use other display resolutions.
If you need a little more distance between the driver and display,
check out the 40-pin FPC extension board.
(https://adafru.it/dXI)
© Adafruit Industries
https://learn.adafruit.com/adafruit-tfp401-hdmi-slash-dvi-decoder-to-40-pin-ttl-display
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