71M6511-IGTR/F Maxim Integrated Products, 71M6511-IGTR/F Datasheet - Page 43

• Manufacturer Part Number: 71M6511-IGTR/F
• Description: IC ENERGY METER RESIDENT 64-LQFP
• Manufacturer: Maxim Integrated Products
• Type: Metering SoCr

Specifications of 71M6511-IGTR/F

• Mounting Style: SMD/SMT
• Package / Case: LQFP-64
• Core: 80515 MPU
• Data Bus Width: 32 bit
• Data Ram Size: 7 KB
• Device Million Instructions Per Second: 5 MIPS
• Interface Type: UART
• Maximum Clock Frequency: 70 Hz
• Maximum Operating Temperature: + 85 C
• Number Of Programmable I/os: 12
• Operating Supply Voltage: 3.3 V
• Processor Series: 71M6511
• Program Memory Size: 64 KB
• Program Memory Type: Flash
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

I2C Interface (EEPROM)
A dedicated 2-pin serial interface implements an I2C driver that can be used to communicate with external EEPROM devices.
The interface can be multiplexed onto the DIO pins DIO4 (SCK) and DIO5 (SDA) by setting the I/O RAM register DIO_EEX
(0x2008[4]). The MPU communicates with the interface through two SFR registers: EEDATA (0x9E) and EECTRL (0x9F). If the
MPU wishes to write a byte of data to EEPROM, it places the data in EEDATA and then writes the ‘Transmit’ code to EECTRL.
The write to EECTRL initiates the transmit sequence. By observing the BUSY bit in EECTRL the MPU can determine when the
transmit operation is finished (i.e. when the BUSY bit transitions from 1 to 0). INT5 is also asserted when BUSY falls. The MPU
can then check the RX_ACK bit to see if the EEPROM acknowledged the transmission.
A byte is read by writing the ‘Receive’ command to EECTRL and waiting for BUSY to fall. Upon completion, the received data
will appear in EEDATA.
The serial transmit and receive clock is 78kHz during each transmission, and SCL is held in a high state until the next
transmission. The bits in EECTRL are shown in Table 57.
The EEPROM interface can also be operated by controlling the DIO4 and DIO5 pins directly. However, controlling DIO4 and
DIO5 directly is discouraged, because it may tie up the MPU to the point where it may become too busy to process
interrupts.
Note: Clock stretching and multi-master operation is not supported for the I
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V3P3-10mV
Figure 11: Voltage Range for V1
400mV
V3P3 -
VBIAS
V3P3
0V
V1
operation,
Battery or
enabled
Normal
mode
WDT
reset
WDT dis-
abled
Single-Phase Energy Meter IC
(V1 < VBIAS)
the battery is
enabled
when
2
C interface.
71M6511/71M6511H
DATA SHEET
NOVEMBER 2010
V2.7