XE8000EV110 Semtech, XE8000EV110 Datasheet - Page 155

• Manufacturer Part Number: XE8000EV110
• Description: EVAL BOARD FOR XE8802AMI035LF
• Manufacturer: Semtech
• Type: MCUr

Specifications of XE8000EV110

• Contents: Fully Assembled Evaluation Board
• For Use With/related Products: XE88LC02MI035
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

19.4.3
With 1:3 multiplexing, each pad_lcd_io pin can drive three segments of the display. In this mode, up to 93
segments of the display can be driven by the pad_lcd_io[30:0] pins. The common nodes are to be connected to the
pad_lcd_com0, pad_lcd_com1 and pad_lcd_io[31]. These connections are shown in Figure 19-6.
Lots of different configurations for the voltage generation can be used. Figure 19-6 shows the connections and
external elements that are required if the display is to be driven from 3.6V independently from the circuit supply
voltage. Other possible configurations are given in section 19.5.4. The recommended value for the external
capacitors is 470nF.
To operate the driver in this configuration, the registers should be loaded with the values in Table 19-15.
© Semtech 2006
1:3 Multiplex scheme
VGEN
Figure 19-6: LCD with 1:3 multiplexing and on-chip 1/3 bias voltage generation.
1.2V voltage
reference
pad_lcd_io[30:0]
pad_lcd_io[31]
pad_lcd_com1
pad_lcd_com0
pad_vgen_v3
pad_vgen_v2
pad_vgen_v1
pad_vgen_va
pad_vgen_vb
pad_lcd_vr1
pad_lcd_vr2
RegVgenCfg0
RegLcdOn
RegLcdSe
RegLcdClkFrame
Table 19-15. Register contents for 1:3 mux example
Register
XE8802 Sensing Machine Data Acquisition MCU
C
SEGMENTS
lcd1
COM2
COM1
COM0
C
lcd2
19-11
C
lcd3
Contents[7:0]
xx110001
xxxxx010
11111111
110xxx10
with ZoomingADC™ and LCD driver
C
aux
LCD DISPLAY
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