71M6541D Datasheet, PDF (69/166 Pages) Maxim Integrated Products – 0.1% Accuracy Over 2000:1 Current Range Energy Meter ICs

71M6541D/F/G and 71M6542F/G Data Sheet
LCD Drivers (71M6541D/F/G)
With a maximum of 35 LCD driver pins available, the 71M6541D/F/G is capable of driving up to 6 x 35 =
210 pixels of an LCD display when using the 6 x multiplex mode. At eight pixels per digit, this
corresponds to 26 digits.
LCD segment data is written to the LCD_SEGn[5:0] I/O RAM registers as described in 2.5.8.2 and 2.5.8.3.
SEG46 through SEG50 cannot be configured as DIO pins. Display data for these pins are written to I/O
RAM registers LCD_SEG46[5:0] through LCD_SEG50[5:0] (see Table 58). When the ICE_E pin is pulled
high, it overrides the SEG functionality, and pins E_RXTX/SEG48, E_TCLK/SEG49 and E_RST/SEG50
function as ICE interface pins.
LCD_MAP[46] and LCD_MAP[47] (I/O RAM 0x2406[6] and 0x2407[7]) must be set to 1 in order to permit
TMUX2OUT/SEG46 and TMUXOUT/SEG47 to operate as SEG drivers, otherwise. If LCD_MAP[46] and
LCD_MAP[47] are 0, these pins operate as TMU2XOUT and TMUXOUT (see 2.5.12 Test Ports
(TMUXOUT and TMUX2OUT Pins) on page 78).
Table 58: 71M6541D/F/G LCD Data Registers for SEG46 to SEG50
SEG
Pin #
46 47 48 49 50
61 60 38 37 36
Configuration
Always LCD pins, except
when used for ICE interface
or TMUXOUT/TMUX2OUT.
SEG Data Register