AM335x interface to LVDS based display panel

Viswanathan T

I have a 7" LCD panel with following pinout. I'm planning to use this display unit with Sitara Starter kit design.

So in that case please suggest what are the changes need to be done with the starter kit design in the display section?

Pin no	I/O	Function
1	P	Common Voltage
2	P	Power Voltage for digital circuit
3	P	Power Voltage for digital circuit
4	--	No Connection
5	I	Global reset pin
6	I	Standby mode , Normally pulled high STBYB = 1, normal operation STBYB = 0, timing controller, source driver will turn off, all output are High-Z
7	P	Ground
8	I	- LVDS differential data input
9	I	+ LVDS differential data input
10	P	Ground
11	I	- LVDS differential data input
12	I	+ LVDS differential data input
13	P	Ground
14	I	- LVDS differential data input
15	I	+ LVDS differential data input
16	P	Ground
17	I	- LVDS differential data input
18	I	+ LVDS differential data input
19	P	Ground
20	I	- LVDS differential data input
21	I	+ LVDS differential data input
22	P	Ground
23	--	No Connection
24	--	No Connection
25	P	Ground
26	--	No Connection
27	O	Backlight CABC controller signal output
28	I	6 Bit/ 8 Bit mode select
29	P	Power for Analog Circuit
30	P	Ground
31	P	LED Cathode
32	P	LED Cathode
33	I	Horizontal Inversion
34	I	Vertical Inversion
35	P	Gate OFF Voltage
36	I	CABC H/W enable
37	I	CABC H/W enable
38	P	Gate ON Voltage
39	P	LED Anode
40	P	LED Anode

P-Power; I-Input; O-Output

over 11 years ago

0 Biser Gatchev-XID over 11 years ago

TI__Guru**** 393215 points

You will need to design an adapter board with an RGB to LVDS interface. For example:

http://e2e.ti.com/support/arm/sitara_arm/f/791/t/181008.aspx.

0 Viswanathan T over 11 years ago in reply to Biser Gatchev-XID

Prodigy 80 points

Thanks for you reply.

Apart from the LVDS signal lines, LCD module also requires some supply voltage such as LED anode, Gate OFF voltage... which is as follows in the below table,

Signal	Voltage
Power Voltage for digital circuit	3.3
Power for Analog Circuit	11
Gate ON Voltage	20
Gate OFF Voltage	-6.8

Is there any option to take these signals from Starter kit from Power management unit (TPS65910A3).

Also the VBat, which is input to the power management unit is ~ 7v / 4A signal. How to calculate current load by the circuit. Can we add any more circuitry with VBat to get the required supply for LCD module.

0 Biser Gatchev-XID over 11 years ago in reply to Viswanathan T

TI__Guru**** 393215 points

You will have to generate the 11V, 20V and -6.8V voltages yourself. The 3.3V can be taken from the SK if the current required does not overload the SK PMIC.

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AM335x interface to LVDS based display panel