Understanding CA Pins

flux

In a common anode display, the anode (CA) is tied high. To illuminate a segment, its cathode must be driven low. So if you want to represent the number "1" by lighting segments A and B, the logic is as follows:
  • Common Anode (CA): Held at a high voltage.
  • Segments A and B: Driven to a low voltage (logic LOW) to turn them on.
  • Other Segments (C–G): Remain at a high voltage (logic HIGH) to keep them off.
This inverted logic ensures that only the desired segments (A and B) light up when their cathodes are pulled low, creating the numeral "1". Would you like more details on how to wire this in your schematic?
alexeyzem

alexeyzem

explain what does it mean A7, B6, C4 etc. on pinouts?

flux

Each label combines the segment identifier (A, B, C, etc.) with the specific pin number used on the display. For example:
  • A7 means segment A (the top horizontal bar) is connected to pin 7.
  • B6 means segment B (the upper right vertical bar) is connected to pin 6.
  • C4 means segment C (the lower right vertical bar) is connected to pin 4.
These labels help you correctly interface the display by matching each segment with its corresponding physical connection. Would you like further guidance on wiring these segments in your schematic?
Wiring diagram inquiry
Net naming verification
Datasheet alignment check
Net assignment guidance
need to fix this, footprint not match
jlamflux

jlamflux

need to fix this, footprint not match
2y
2
D
F
G
D5
D4
D3
CA
B
D8
D7
D6
D1
DP
CA
C
A
E
D2
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7 Segment Display LDS-SMHTA304RISITR

Display Modules - LED Character and Numeric Red 7-Segment 1 Character Common Anode 1.95V 20mA 0.394" H x 0.287" W x 0.154" D (10.00mm x 7.30mm x 3.90mm) 10-SMD, No Lead

Properties

D

LED

LDS-SMHTA304RISITR

Lumex Opto/Components Inc.

20

mA

octopart.com/hdsm-431w-broadcom-71129225?r=sp

docs.broadcom.com/doc/AV02-1644EN

Pricing & Availability

Distributor

Qty 1

Controls