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14 TRI-COLOR LED CONNECTION CIRCUIT
36
EPSON
S5U1C17801T1100 HARDWARE MANUAL
(SOFTWARE EVALUATION TOOL FOR S1C17801)
14 Tri-color LED Connection Circuit
The SVT17801 is equipped with a tri-color LED being connected to the S1C17801 as shown in the following dia-
gram.
+5V
LED1
598-9920-307F
R92
R31
MMBTA42-TP
S1C17801
P14
P16
P15
MMBTA42-TP
MMBTA42-TP
Q4
Q2
Q3
1K
R29 1K
R30 1K
R28
R26
R27
5.1K
1.8K
1.8K
1
2
3
0
4
Fig. 14.1 Tri-color LED Connection Circuit
As the figure 14.1 shows, P14/P15/P16 ports are connected to the tri-color LED, H/L combination of which can
represent total seven colors. The following table lists the LED colors formed by H/L combination of each port.
Table 14.1 Color on Tri-color LED Corresponding to Port Status
S1C17801 Color on Tri-color LED
P16 P15 P14
L L L (light off)
L L H (green)
L H L (blue)
L H H (aqua)
H L L (red)
H L H (orange)
H H L (purple)
H H H (white)