Understanding CA Pins

flux

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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?
286 days
alexeyzem

alexeyzem

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

flux

0:29

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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?
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need to fix this, footprint not match
jlamflux

jlamflux

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

7 Segment Display LDS-SMHTA304RISITR
Description

Created
Last updated by jlamflux
3 Contributor(s)
jlamflux
jbreidfjord-dev
angus

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Properties

Designator Prefix
D
Part Type
LED
Manufacturer Part Number
LDS-SMHTA304RISITR
Manufacturer Name
Lumex Opto/Components Inc.
Current
20 mA

Availability & Pricing

DPNStockQty 1
11K$1.355
13.6K$0.9342
10$2.2063
10$2.30
5450–1.7K$1.355–$1.9285

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