71M6543F/H and 71M6543G/GH Data Sheet
behavior of each individual part across industrial temperatures (see 4.5.3 Temperature Coefficients for
the 71M6543H). The resulting tracking of the reference VREF voltage is within ±10 ppm/°C.
4.6
Connecting I2C EEPROMs
I2C EEPROMs or other I2C compatible devices should be connected to the DIO pins SEGDIO2 and
SEGDIO3, as shown in Figure 33.
Pullup resistors of roughly 10 kΩ to V3P3D (to ensure operation in BRN mode) should be used for both
SDCK and SDATA signals. The DIO_EEX (I/O RAM 0x2456[7:6]) field must be set to 01 in order to convert
the DIO pins SEGDIO2 and SEGDIO3 to I2C pins SCL and SDATA.
V3P3D
10 kΩ
10 kΩ
EEPROM
DIO2
DIO3
SDCK
SDATA
71M6543
Figure 33: I2C EEPROM Connection
4.7
Connecting Three-Wire EEPROMs
µWire EEPROMs and other compatible devices should be connected to the DIO pins SEGDIO2 and
SEGDIO3, as described in 2.5.11 EEPROM Interface on page 66.
4.8
UART0 (TX/RX)
The UART0 RX pin should be pulled down by a 10 kΩ resistor and additionally protected by a 100 pF
ceramic capacitor, as shown in Figure 34.
71M6543
10 kΩ
100 pF
RX
RX
TX
Figure 34: Connections for UART0
TX
4.9
Optical Interface (UART1)
The OPT_TX and OPT_RX pins can be used for a regular serial interface (by connecting a RS_232
transceiver for example), or they can be used to directly operate optical components (for example, an
infrared diode and phototransistor implementing a FLAG interface). Figure 35 shows the basic connections
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