71m6521be Maxim Integrated Products, Inc., 71m6521be Datasheet - Page 63

• Manufacturer Part Number: 71m6521be
• Description: Energy Meter Ic
• Manufacturer: Maxim Integrated Products, Inc.

I
Pull-up resistors of roughly 10kΩ to V3P3D (to ensure operation in BROWNOUT mode) should be used for both SCL and SDA
signals. The DIO_EEX register in I/O RAM must be set to 01 in order to convert the DIO pins DIO4 and DIO5 to I
and SDA.
µWire EEPROMs and other compatible devices should be connected to the DIO pins DIO4 and DIO5, as shown in Figure 32.
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
71M6521BE. A pull-up resistor of roughly 10kΩ to V3P3D (to ensure operation in BROWNOUT mode) should be used for the
DI/DO signals, and the CS pin should be pulled down with a resistor to prevent that the three-wire device is selected on power-
up, before the 71M6521BE can establish a stable signal for CS. The DIO_EEX register in I/O RAM must be set to 10 in order to
convert the DIO pins DIO4 and DIO5 to uWire pins. The pull-up resistor for DIO5 may not be necessary.
V1.0
2
C EEPROMs or other I
2
C compatible devices should be connected to the DIO pins DIO4 and DIO5, as shown in Figure 31.
Connecting Three-Wire EEPROMs
© 2005-2008 TERIDIAN Semiconductor Corporation
Figure 32: Three-Wire EEPROM Connection
6521B
6521B
Figure 31: I
Connecting I
6521B
6521B
DIO5
DIO5
DIOn
DIOn
DIO4
DIO4
DIO4
DIO4
DIO5
DIO5
2
10kΩ
10kΩ
C EEPROM Connection
2
C EEPROMs
10kΩ
10kΩ
10kΩ
10kΩ
10kΩ
10kΩ
EEPROM
EEPROM
SCL
SCL
SDA
SDA
V3P3D
V3P3D
V3P3D
V3P3D
EEPROM
EEPROM
DI
DI
DO
DO
CS
CS
SCLK
SCLK
Energy Meter IC
71M6521BE
DATA SHEET
JANUARY 2008
Page: 63 of 97
2
C pins SCL