HX8357B TFT LCD controller pinout

The HX8357B drives a 320 × 480 TFT. The CFAF320480C4-035T module exposes selectable host interfaces and six separate LED backlight returns.

CFAF320480C4-035T · FPC-50

50 contacts Current package

Himax Technologies ·

CFAF320480C4-035T · FPC-50 pinout

CFAF320480C4-035T · FPC-50

Locate contact 1 in the module’s mechanical drawing and check the mating connector contact side.

Selected pin details

34 · MOSI

Input · Inputs

Host serial data input.

Crystalfontz CFAF320480C4-035T datasheet, 2017-09-07, §§ 6, 8 and 10.

Electrical limits · Link to this pin

All 50 pins

Pin	Signal	Direction	Function
1	GND Supply return	Supply return	Connect to host ground.
2	VLOGIC I/O Supply input	Supply input	Digital interface supply.
3	VLOGIC I/O Supply input	Supply input	Digital interface supply.
4	VANALOG Supply input	Supply input	Analog supply.
5	VANALOG Supply input	Supply input	Analog supply.
6	IM0 Input	Input	Interface mode strap. Tie high for 4-wire SPI.
7	IM1 Input	Input	Interface mode strap. Tie high for 4-wire SPI.
8	IM2 Input	Input	Interface mode strap. Tie high for 4-wire SPI.
9	RST Input	Input	Active-low reset after power-up.
10	VSYNC Input	Input	Vertical synchronization. Tie high when unused.
11	HSYNC Input	Input	Horizontal synchronization. Tie high when unused.
12	PCLK Input	Input	Pixel clock in RGB mode. Ground when unused.
13	DE Input	Input	Data enable in RGB mode. Ground when unused.
14	DB17 Bidirectional	Bidirectional	Parallel data bit 17.
15	DB16 Bidirectional	Bidirectional	Parallel data bit 16.
16	DB15 Bidirectional	Bidirectional	Parallel data bit 15.
17	DB14 Bidirectional	Bidirectional	Parallel data bit 14.
18	DB13 Bidirectional	Bidirectional	Parallel data bit 13.
19	DB12 Bidirectional	Bidirectional	Parallel data bit 12.
20	DB11 Bidirectional	Bidirectional	Parallel data bit 11.
21	DB10 Bidirectional	Bidirectional	Parallel data bit 10.
22	DB9 Bidirectional	Bidirectional	Parallel data bit 9.
23	DB8 Bidirectional	Bidirectional	Parallel data bit 8.
24	DB7 Bidirectional	Bidirectional	Parallel data bit 7.
25	DB6 Bidirectional	Bidirectional	Parallel data bit 6.
26	DB5 Bidirectional	Bidirectional	Parallel data bit 5.
27	DB4 Bidirectional	Bidirectional	Parallel data bit 4.
28	DB3 Bidirectional	Bidirectional	Parallel data bit 3.
29	DB2 Bidirectional	Bidirectional	Parallel data bit 2.
30	DB1 Bidirectional	Bidirectional	Parallel data bit 1.
31	DB0 Bidirectional	Bidirectional	Parallel data bit 0.
32	GND Supply return	Supply return	Connect to host ground.
33	MISO Output	Output	Serial data return. Leave open for a write-only host.
34	MOSI Input	Input	Host serial data input.
35	RD Input	Input	Parallel read strobe. Tie to VLOGIC I/O in the serial fixture.
36	WR_SCK Input	Input	Serial clock in SPI mode or write strobe in parallel mode.
37	DC Input	Input	Low for a command and high for data.
38	CS Input	Input	Active-low controller select.
39	NC None	None	Reserved contact. Leave open.
40	NC None	None	Reserved contact. Leave open.
41	NC None	None	Reserved contact. Leave open.
42	NC None	None	Reserved contact. Leave open.
43	A1 Supply input	Supply input	Common anode for the module backlight.
44	LEDK1 LED cathode	LED cathode	Use a separate current-limited return for this backlight branch.
45	LEDK2 LED cathode	LED cathode	Use a separate current-limited return for this backlight branch.
46	LEDK3 LED cathode	LED cathode	Use a separate current-limited return for this backlight branch.
47	LEDK4 LED cathode	LED cathode	Use a separate current-limited return for this backlight branch.
48	LEDK5 LED cathode	LED cathode	Use a separate current-limited return for this backlight branch.
49	LEDK6 LED cathode	LED cathode	Use a separate current-limited return for this backlight branch.
50	GND Supply return	Supply return	Connect to host ground.

Signal assignments

Display SPI

The host sends the clock and display data. The separate D/C line distinguishes command or register index from data.

RGB video input

RGB video timing and data-bus width depend on the mode straps and initialization.

Electrical limits

Parameter	Limit	Conditions and source
Shared analog and interface rail3.3 V fixture	3.3 V fixture	The reference design uses a single regulated 3.3 V rail for the four power contacts. Crystalfontz CFAF320480C4-035T datasheet, 2017-09-07, §§ 6, 8 and 10.
Panel pixels320 × 480	320 × 480	Portrait coordinates. Crystalfontz CFAF320480C4-035T datasheet, 2017-09-07, §§ 6, 8 and 10.
Backlight120 mA typical total	120 mA typical total	Six individual returns, 3.2 V typical forward voltage. Use independent current limiting per branch. Crystalfontz CFAF320480C4-035T datasheet, 2017-09-07, §§ 6, 8 and 10.

Models and documents

This map applies to the Crystalfontz non-touch FPC-50 module with HX8357B or a documented compatible controller. The touch-panel version has different assignments on contacts 39–42.

CFAF320480C4-035T: 3.5-inch 320 × 480 display module without touch panel.

Crystalfontz CFAF320480C4-035T manufacturer documentation· Crystalfontz CFAF320480C4-035T datasheet, 2017-09-07, §§ 6, 8 and 10.
HX8357B controller datasheet· Himax HX8357-B Preliminary V01, host-interface and command sections.