71M6541D Datasheet, PDF (68/166 Pages) Maxim Integrated Products – 0.1% Accuracy Over 2000:1 Current Range Energy Meter ICs

71M6541D/F/G and 71M6542F/G Data Sheet
The LCD bias may be compensated for temperature using the LCD_DAC[4:0] field (I/O RAM 0x240D[4:0]).
The bias may be adjusted from 1.4 V below the 3.3 V supply (V3P3SYS in MSN mode and VBAT in BRN
and LCD modes). When the LCD_DAC[4:0] field is set to 000, the DAC is bypassed and powered
down. This can be used to reduce current in LCD mode.
STATIC (LCD_MODE=100)
COM0
COM1
COM2
COM3
COM4
COM5
SEG_ON
SEG_OFF
(1/2)
(1/2)
(1/2)
(1/2)
(1/2)
1/3 BIAS, 3 STATES (LCD_MODE = 011 )
012
COM0
COM1
COM2
COM3
COM4
(2/3)
(1/3)
COM5
SEG_ON
SEG_OFF
1/2 BIAS, 2 STATES (LCD_MODE = 010 )
01
COM0
COM1
COM2
(1/2)
COM3
(1/2)
COM4
(1/2)
COM5
(1/2)
SEG_ON
SEG_OFF
T
1/3 BIAS, 4 STATES (LCD_MODE = 000 )
0123
COM0
COM1
COM2
COM3
COM4
COM5
SEG_ON
SEG_OFF
1/2 BIAS, 3 STATES (LCD_MODE = 011 )
012
COM0
COM1
COM2
COM3
(1/2)
COM4
(1/2)
COM5
(1/2)
SEG_ON
SEG_OFF
1/3 BIAS, 6 STATES (LCD_MODE = 110 )
012345
COM0
COM1
COM2
COM3
COM4
COM5
SEG_ON
SEG_OFF
Figure 21: LCD Waveforms