78M6612-IM/F View Datasheet(PDF) - Teridian Semiconductor Corporation

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78M6612-IM/F

Single-Phase, Dual-Outlet Power and Energy Measurement IC

Teridian Semiconductor Corporation 

78M6612 Data Sheet

DS_6612_001

3.7 Connecting Three-Wire EEPROMs

µWire EEPROMs and other compatible devices should be connected to the DIO pins DIO4 and DIO5, as

shown in Figure 13 and described below:

• DIO5 connects to both the DI and DO pins of the three-wire device.

• The CS pin must be connected to a vacant DIO pin of the 78M6618.

• In order to prevent bus contention, a 10 kΩ to resistor is used to separate the DI and DO signals.

• The CS and CLK pins should be pulled down with resistors to prevent operation of the three-wire

device on power-up, before the 78M6618 can establish a stable signal for CS and CLK.

• The DIO_EEX register in I/O RAM must be set to 2 (b10) in order to convert the DIO pins DIO4 and

DIO5 to µWire pins.

The µ-Wire EEPROM interface is only functional when MPU_DIV[2:0] = 000.

78M6612

10k Ω

DIO4

DIO5

DIOn

V3P3D

10k Ω

EEPROM

SCLK

DI

DO

CS

Figure 13: Three-Wire EEPROM Connection

3.8 UART0 (TX0/RX0)

The UART0 RX0 pin should be pulled down by a 10 kΩ resistor and additionally protected by a 100 pF

ceramic capacitor, as shown in Figure 14.

78M6612

RX0 100pF 10kΩ

RX 0

TX0

TX0

Figure 14: Connections for the RX0 Pin

24

Rev 2

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