Author Topic: Active Lo/Active Hi signals for these TFTs?  (Read 71 times)

mike_s

  • Newbie
  • *
  • Posts: 2
  • Karma: 0
    • View Profile
Active Lo/Active Hi signals for these TFTs?
« on: January 06, 2019, 12:36:45 PM »
Hi Everyone,

I'm currently working on my initial setup with this TFT: NHD-5.0-800480TF-ATXL-CTP

The datasheets don't specifically call out or mark the signals as Active Hi or Active Lo... these are the signals for this panel:

 
Pin No.    Symbol    External Connection    Function Description       
1    LED-    LED Power Supply    Ground for Backlight    
 
2    LED+    LED Power Supply    Backlight Power Supply (60mA @ ~19.2V)       
3    GND    Power Supply    Ground       
4    VDD    Power Supply    Power supply for LCD and logic (3.3V)       
5-12    [R0-R7]    MPU    Red Data Signals       
13-20    [G0-G7]    MPU    Green Data Signals       
21-28    [B0-B7]    MPU    Blue Data Signals       
29    GND    Power Supply    Ground       
30    CLKIN    MPU    Clock for input data (Rising Edge)       
31    STBYB    MPU    1: Normal Operation;0: Standby Mode       
32    HSD    MPU    Line synchronization signal      ****   PULL-UP?  ****
33    VSD    MPU    Frame synchronization signal      ****  PULL-UP? ****
34    DEN    MPU    Data Enable signal       
35    NC    -    No Connect       
36    GND    Power Supply    Ground       
37    XR    -    No Connect       
38    YD    -    No Connect       
39    XL    -    No Connect       
40    YU    -    No Connect    


 
Pin No.    Symbol    External Connection    Function Description       
1    VCC    Power Supply    Power supply for logic (3.0V)       
2    GND    Power Supply    Ground       
3    SCL    MPU    Serial I2C Clock (Requires pull-up resistor)       
4    SDA    MPU    Serial I2C Data (Requires pull-up resistor)       
5    /INT    MPU    Interrupt signal from touch panel module to host        ****   PULL-UP  ****
6    /RESET    MPU    Active LOW Reset signal                                        ****   PULL-UP  ****



From the timing diagrams, It seems that ONLY  VSD, HSD, INT, & RESET are active LO signals?  all the rest are Active HI, ie default state is pulled down..

Can anyone verify that this is correct, ONLY VSD, HSD, INT, & RESET need to be pulled-up?

Thanks so much,

- Mike


« Last Edit: January 06, 2019, 12:49:01 PM by mike_s »

 

7.0" TFTs with capacitive Touch and 8080 interface availability?

Started by gdoraisaBoard TFTs

Replies: 1
Views: 4252
Last post June 30, 2016, 07:54:11 AM
by Saurabh_B
New 7.0" TFTs with Capacitive Touch are now available!

Started by Bridgette_EBoard New Product Releases

Replies: 0
Views: 5535
Last post April 07, 2014, 09:54:14 AM
by Bridgette_E
FPGA driver for NHD-2.4-240320CF TFTs

Started by joaBaurBoard TFTs

Replies: 3
Views: 955
Last post June 07, 2018, 08:12:24 AM
by Paul_B
FPGA driver for NHD-1.8-128160EF TFTs

Started by joaBaurBoard TFTs

Replies: 1
Views: 664
Last post June 13, 2018, 11:58:31 AM
by joaBaur
New 4.3" IPS TFTs

Started by Bridgette_EBoard New Product Releases

Replies: 0
Views: 5669
Last post March 24, 2014, 09:37:54 AM
by Bridgette_E