AVT5246 PCB Layout, ATmega32A Photo Frame Board, TFT Layout

User question

AVT5246 PCB layout

Artificial Intelligence Response

Direct answer to the question

The AVT5246 PCB layout is available in the official AVT documentation package. AVT5246 is not an LED automotive controller; it is the AVT-5246 “ATframe” digital photo frame project from Elektronika Praktyczna 7/2010. The official manual states that AVT-5246A is the PCB version and that additional materials include PCB patterns/wzory płytek PCB. (serwis.avt.pl)

You can get the layout in two practical ways:

• From the AVT5246 PDF manual: the PCB assembly/layout drawing is shown as Figure 3: “Schemat montażowy układu ATframe”. (serwis.avt.pl)
• From the AVT service archive: the AVT software/materials page lists AVT5246.zip, 300.3 kB, which is the likely package containing the project’s additional files, including PCB artwork mentioned in the manual. (serwis.avt.pl)

Detailed problem analysis

AVT5246 is a compact AVR-based digital photo frame board built around:

Block	Main parts
MCU	ATmega32A, TQFP-44
Display	Winstar WF35DTIBCDB, 3.5", 320×240 TFT, FSA506 controller
Storage	SD card socket, push-push type
Supply	5.5–6 V input, 3.3 V regulator
Regulator	NCP1117DT33G in DPAK
Clock	16 MHz low-profile crystal
Interface	20-pin ZIF connector, 1 mm pitch

The official manual gives the basic electrical parameters as 5.5–6 VDC supply, about 400 mA load current, and a 72×54 mm active image area. (serwis.avt.pl)

The PCB was designed to mount mechanically to the TFT display in a sandwich-style construction, and the design intentionally uses small SMD parts to reduce the total device thickness. (serwis.avt.pl)

Important PCB layout / assembly notes for AVT5246

From the official mounting description:

• The board uses SMD parts, including the ATmega32A in TQFP-44, so fine-pitch soldering quality is important. (serwis.avt.pl)
• The ZIF connector for the TFT ribbon cable is mounted on the component side. (serwis.avt.pl)
• Components C1, C2, C6, R1 and U1 are to be mounted on the bottom side of the PCB. (serwis.avt.pl)
• Depending on enclosure/mechanical requirements, D1 and the PWR connector may also be mounted on the bottom side to reduce thickness. (serwis.avt.pl)
• The SD card socket and UP/DOWN microswitches are mounted last. (serwis.avt.pl)

The parts list from the manual includes:

Designator	Value / type
R1	22 kΩ, SMD 1206
C1, C2	10 µF / 16 V, SMD
C3, C4	22 pF
C5–C7	100 nF
D1	1N4004
U1	NCP1117DT33G, DPAK, 3.3 V regulator
U2	ATmega32A, TQFP-44
Q1	16 MHz low-profile crystal
ZIF	20-pin, 1 mm pitch, top-contact ZIF connector
SD-CON	Push-push SD card socket
GLCD	Winstar WF35DTIBCDB 3.5" TFT display	(serwis.avt.pl)

Practical guidelines

If you want to reproduce the PCB:

1. Use the AVT5246.zip archive first
   It is the best source for the actual PCB artwork/files because the PDF manual explicitly says that additional materials include PCB patterns. (serwis.avt.pl)

2. If using the PDF image only, print at 100% scale
   Do not use “fit to page”. Verify dimensions against the TFT mounting holes and ZIF connector spacing before etching or ordering a PCB.

3. Check top/bottom orientation carefully
   The AVT drawing shows both component-side and bottom-side placement. If making the board by toner transfer or photo method, incorrect mirroring will make the TQFP, SD socket, or ZIF connector unusable.

4. Pay special attention to the ATmega32A TQFP-44 footprint
   Inspect all pins under magnification after soldering. Bridges between adjacent pins are likely if hand-soldered.

5. Keep the 3.3 V regulator layout thermally adequate
   The NCP1117 in DPAK dissipates power from roughly 5.5–6 V down to 3.3 V at up to about 400 mA. That can be around:

\[ P \approx (6.0 - 3.3) \times 0.4 = 1.08\ \text{W} \]

So the copper area around U1 should not be reduced if you redraw the board.

6. Do not lengthen the TFT ribbon unnecessarily
   The manual suggests a ZIF ribbon length of about 3.5–4 cm. Longer cables can increase signal integrity problems on the 8-bit parallel TFT bus. (serwis.avt.pl)

Brief summary

The original AVT5246 PCB layout is in the official AVT5246 project materials. The PDF manual shows the board layout in Figure 3, and the AVT service archive lists AVT5246.zip, which is the best place to obtain the actual PCB artwork. The board is an AVR/TFT/SD-card digital photo frame using an ATmega32A, NCP1117-3.3 V regulator, SD socket, and 20-pin ZIF TFT connector—not an automotive LED controller.

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