71M6521FE-IMR/F Maxim Integrated Products, 71M6521FE-IMR/F Datasheet - Page 78

• Manufacturer Part Number: 71M6521FE-IMR/F
• Description: IC ENERGY METER 32K FLASH 68-QFN
• Manufacturer: Maxim Integrated Products

Specifications of 71M6521FE-IMR/F

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LCD_E
LCD_MODE[2:0]
LCD_NUM[4:0]
LCD_ONLY
LCD_SEG0[3:0]
…
LCD_SEG19[3:0]
LCD_SEG24[3:0]
…
LCD_SEG38[3:0]
LCD_Y
MPU_DIV[2:0]
MUX_ALT
Page: 78 of 107
2021[5]
2021[4:2]
2020[4:0]
20A9[5]
2030[3:0]
…
2043[3:0]
2048[3:0]
…
2056[3:0]
2021[6]
2004[2:0]
2005[2]
…
…
0
0
0
0
0
0
0
0
0
0
0
…
…
--
--
--
--
--
--
--
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
W
Enables the LCD display. When disabled, VLC2, VLC1, and VLC0
are ground as are the COM and SEG outputs.
The LCD bias mode.
Number of dual-purpose LCD/DIO pins to be configured as LCD.
This will be a number between 0 and 18. The first dual-purpose pin
to be allocated as LCD is SEG41/DIO21. Thus if LCD_NUM=2,
SEG41 and SEG 40 will be configured as LCD. The remaining
SEG39 to SEG24 will be configured as DIO19 to DIO4.
DIO1 and DIO2 (plus DIO3 on the QFN-68 package) are always
available, if not used for the optical port.
See tables in Application Section.
Takes the 6521FE/DE to LCD mode. Ignored if system power is
present. The part will awaken when autowake timer times out,
when push button is pushed, or when system power returns.
LCD Segment Data. Each word contains information for from 1 to 4
time divisions of each segment. In each word, bit 0 corresponds to
COM0, on up to bit 3 for COM3.
LCD Blink Frequency (ignored if blink is disabled or if segment is
off).
0: 1Hz (500ms ON, 500ms OFF)
1: 0.5Hz (1s ON, 1s OFF)
The MPU clock divider (from 4.9152MHz). These bits may be pro-
grammed by the MPU without risk of losing control.
MPU_DIV remains unchanged when the part enters BROWNOUT
mode.
The MPU asserts this bit when it wishes the MUX to perform ADC
conversions on an alternate set of inputs.
000-4.9152MHz, 001-4.9152MHz /2
These bits are preserved in LCD and SLEEP modes,
even if their pin is not configured as SEG. In this case,
they can be useful as general-purpose non-volatile
storage.
000: 4 states, 1/3 bias
001: 3 states, 1/3 bias
010: 2 states, ½ bias
011: 3 states, ½ bias
100: static display
71M6521DE/DH/FE Data Sheet
1
, …, 111-4.9152MHz /2
7
Rev 2