For anyone who might be interested……here are where the pin outs are on the ARM MCU when using the built in LTDC to drive the LCD-TFT Display. I have extrapolated all LCD related signals and RGB data lines from the ARM MCU data sheets tables pgs. 58 - 77 to transcribe them in color onto the chip drawing below. Feel free to fact check me.
By the way…..when working with electronics at the PCB or component level….always use a grounding strap to avoid possible damage by ESD
Below is from the the LTDC (LCD-TFT display controller) Application Notes….bare in mind that the RGB666 is not the LCD-TFT display used in the Tricorder…it is shown as an example LCD. The configuration of LCD module may change from mfg to mfg.
On the LDTC below I’ve labeled the pin outs to cross reference what I labeled on the chip with color coding for RGB, etc. as well as also cross reference to the tables in the ARM LTDC data sheets mentioned above.
Perhaps this will help someone, if not now, then in the future ……
I still think we need schematics or the mfg and or P/N to the Tricorder’s actual display module to see what it’s actual input requirements are from the ARM.
So far, from the teardown vid…I’m not seeing separate wiring cable for Power and Ground to the display other than the 24 pin ribbon cable. I’m presuming that those signals might be supplied to the display from the ARM through the 24 pin ribbon cable. Unless there was a separate power and ground cable that was hidden so that it wasn’t seen in the teardown vid.
Here’s a quick overview of what’s mentioned about power management within the ARM from its datasheet…
“
Reset and power management
• 3 separate power domains which can be independently clock-gated or switched off:
– D1: high-performance capabilities
– D2: communication peripherals and timers
– D3: reset/clock control/power management
• 1.62 to 3.6 V application supply and I/Os
• POR, PDR, PVD and BOR
• Dedicated USB power embedding a 3.3 V internal regulator to supply the internal PHYs
• Embedded regulator (LDO) with configurable scalable output to supply the digital circuitry
• Voltage scaling in Run and Stop mode (6 configurable ranges)
• Backup regulator (~0.9 V)
• Voltage reference for analog peripheral/VREF+
• Low-power modes: Sleep, Stop, Standby and VBAT supporting battery charging “
“
Low-power consumption
• VBAT battery operating mode with charging capability
• CPU and domain power state monitoring pins
• 2.95 μA in Standby mode (Backup SRAM OFF,
RTC/LSE ON)”
Btw…..the Tricorder LCD-TFT module is also known as a peripheral….when reading the ARM data sheets and the LTDC Application Notes….
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