500 Series Module Front Panel Design

azet

azet

It’s a 4-pin bicolor. Can you outline the correct series resistor placement for independent red/green control?

flux

Here’s how to wire a 4‑pin, independent bi‑color indicator so red and green are controlled separately. Use one series Resistor per color. Do not share a resistor between dies.
Option A: source current from GPIO (active‑high)
  • RISC-V microcontroller GPIOx -> Rred -> LED_R Anode; LED_R Cathode -> GND
  • MCU GPIOy -> Rgreen -> LED_G Anode; LED_G Cathode -> GND
  • Drive pin HIGH to turn on, LOW (or Hi‑Z) to turn off.
Option B: sink current to GPIO (active‑low)
  • VDD -> Rred -> LED_R Anode; LED_R Cathode -> MCU GPIOx
  • VDD -> Rgreen -> LED_G Anode; LED_G Cathode -> MCU GPIOy
  • Drive pin LOW to turn on, HIGH (or Hi‑Z) to turn off.
Notes
  • Use one resistor per color on your Bi-color LED 0805. Choose R independently for red vs green to balance brightness.
  • When powering an LED directly from an MCU GPIO, ensure the LED current is kept between 4 and 20 mA and always check the datasheet. Also check the MCU’s per‑pin and per‑port limits.
  • Keep the LED supply at or below the MCU I/O voltage. If VLED > VIO (e.g., 5 V LED supply with 3.3 V MCU), do not connect directly to the GPIO; use a transistor driver or level shifting.
  • For dimming and matching, use PWM on each color channel. Turning both channels on mixes to an intermediate color.
If you share your LED supply voltage and your target currents, I can compute the exact resistor values next.
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Files

Pins

Symbol

Layout

Preview

VDD1(VDD)
NC
SCL
VPP(VCC)
SDA
VDD2(VBAT)
IREF
VCOMH
C2N
C2P
VSS
~{RES}
C1P
C1N
Name
Pin #
Type
Part Type
Terminal Order
Terminal Type
C2P
1
Unspecified
Terminal
unspecified
C2N
2
Unspecified
Terminal
unspecified
C1P
3
Unspecified
Terminal
unspecified
C1N
4
Unspecified
Terminal
unspecified
VDD2(VBAT)
5
Unspecified
Terminal
unspecified
NC
6
Unspecified
Terminal
unspecified
VSS
7
Unspecified
Terminal
unspecified
VDD1(VDD)
8
Unspecified
Terminal
unspecified
~{RES}
9
Unspecified
Terminal
unspecified
SCL
10
Unspecified
Terminal
unspecified
SDA
11
Unspecified
Terminal
unspecified
IREF
12
Unspecified
Terminal
unspecified
VCOMH
13
Unspecified
Terminal
unspecified
VPP(VCC)
14
Unspecified
Terminal
unspecified

N050-8848TSWYG02-H14