6: Display Card
Snapdragon 845 HDK Hardware Development Kit User Guide
43
B2B
QCT800H
B2B
5.7" FHD TFT
1x4lanes
1x4lanes
SPI
Carrier Board
Display Card
Processor Board (10L AnyLayer)
J
J
0
0
5
5
0
0
1
1
Figure 6-2 Display Card Default Configuration
Table 6-2 Display Power Domains
Display Signal
Power Domain
PM845 VREG_S4A_1P8 (1.8V)
up to 300 mA
PM845 VREG_L28A_3P0 (3.0V)
up to 150 mA
PM845 VREG_L14A_1P8 (1.8V)
up to 300 mA
PM845 VREG_L6A_1P85 (1.8V)
up to 50 mA
Carrier 3.3V
up to 0.5A
Carrier 5 V
up to 1.5A
Carrier 12 V
up to 0.5A
HDK845 display card (part number: 20-PB892-H10) is an additional PCBA that mates with the display
connector J1301 on the carrier board. This board allows users to interface with the development kit
via the LCD (see below for details) that comes preinstalled on the display card. Figure 6-2 Display
Card Default Configuration, illustrates the interfacing connectors on the display card.
The display card comes as an additional add-on to the HDK845 development kit.
Connecting the Display Card to the Development Kit
This configuration allows the user to use the preinstalled LCD display that comes with the display
board. As shown in the block diagram below, the MIPI DSI0 lines, which come from the 100-pin ERM8
connector, directly connects to the QHD TFT panel. See the section below for more details on this LCD
panel. It is important to note that connector J0501 of the display card needs to connect to J1301 of the
carrier board for this configuration to work.