User guide

71M6533-DB Demo Board User’s Manual
Page: 48 of 75 ` REV 3
Figure 2-10: EEPROM Circuit
2.4.5 LCD
The 71M6533 has an on-chip LCD controller capable of controlling static or multiplexed LCDs. Figure 2-11
shows the basic connection for LCDs. Note that the LCD module itself has no power connection.
Figure 2-11: LCD Connections
2.4.6 OPTICAL INTERFACE
The 71M6533 IC is equipped with two pins supporting the optical interface: OPT_TX and OPT_RX. The
OPT_TX pin can be used to drive a visual or IR light LED with up to 20mA, a series resistor (R
2
in Figure 2-12)
helps limiting the current). The OPT_RX pin can be connected to the collector of a photo-transistor, as shown in
Figure 2-12.
DIO4
DIO5
71M6533
EEPROM
SCL
SDA
V3P3D
10kΩ
10kΩ
DIO4
DIO5
71M6533
EEPROM
SCL
SDA
V3P3D
10kΩ
10kΩ
segments
71M6533
LCD
commons
segments
71M6533
LCD
commons