71M6542F-IGT/F Maxim Integrated Products, 71M6542F-IGT/F Datasheet - Page 66

• Manufacturer Part Number: 71M6542F-IGT/F
• Description: PMIC Solutions Precision Energy Meter IC
• Manufacturer: Maxim Integrated Products
• Type: Metering SoCr

Specifications of 71M6542F-IGT/F

• Core: 8051
• Core Architecture: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 5 KB
• Device Million Instructions Per Second: 5 MIPS
• Interface Type: I2C, ICE, SPI, UART
• Maximum Clock Frequency: 5 MHz
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Number Of Programmable I/os: 51
• Number Of Timers: 2
• On-chip Adc: 22 bit
• Operating Supply Voltage: 3 V to 3.6 V
• Package / Case: LQFP-100
• Processor Series: 8051
• Program Memory Size: 64 KB
• Program Memory Type: Flash
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

The LCD system has the ability to drive up to six segments per SEG driver. If the display is configured with
six back planes, the 6-way multiplexing compresses the number of SEG pins required to drive a display and
therefore enhance the number of DIO pins available to the application. Refer to the LCD_MODE[2:0] field
(I/O RAM 0x2400[6:4]) settings
multiplexing is selected, SEGDIO27 is converted to COM4. If 6-state multiplexing is selected, SEGDIO26
is converted to COM5. These conversions override the SEG/DIO mapping of SEGDIO26 and SEGDIO27.
Additionally, independent of LCD_MODE[2:0], if LCD_ALLCOM = 1, then SEGDIO26 and SEGDIO27
become COM4 and COM5 if their LCD_MAP[ ] bits are set.
The LCD_ON (I/O RAM 0x240C[0]) and LCD_BLANK (I/O RAM 0x240C[1]) bits are an easy way to either
blank the LCD display or turn it fully on. Neither bit affects the contents of the LCD data stored in the
LCDSEG_DIO[ ] registers. In comparison, LCD_RST (I/O RAM 0x240C[2]) clears all LCD data to zero.
LCD_RST affects only pins that are configured as LCD.
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A small amount of power can be saved by programming the LCD frequency to the lowest value
that provides satisfactory LCD visibility over the required temperature range.
© 2008–2011 Teridian Semiconductor Corporation
(Table
57) for the different LCD multiplexing choices. If 5-state
v1.1