xe8802 Semtech Corporation, xe8802 Datasheet - Page 169

• Manufacturer Part Number: xe8802
• Description: Data Acquisition Soc With 16+10 Bit Zoomingadc? Embedded Risc Controller And Lcd Driver
• Manufacturer: Semtech Corporation

Figure 19-20 and Table 19-27 show a possible example for such a configuration. In this case, the LCD driver
voltage V3=VBAT and V1=VBAT/2 (1/2 bias mode, VgenMode=1, VgenRefEn=0 and VgenOff=0 in
RegVgenCfg0). The LCD is in 1:2 multplexing (LcdMux=01 in RegLcdOn) and LcdSe19=LcdSe23=1 while all
other bits in RegLcdSe are 0.
© Semtech 2006
VGEN
1.2V voltage
reference
Figure 19-20: Sharing LCD (1:2 mux) and digital I/O (low impedance V3)
Table 19-27. Register contents for configuration of Figure 19-20.
RegVgenCfg0
RegLcdOn
RegLcdSe
pad_lcd_io[31:24]
pad_lcd_io[23:16]
pad_lcd_io[15:0]
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
Register
vbat
vss
XE8802 Sensing Machine Data Acquisition MCU
SEGMENTS[7:0]
C
lcd1
COM1
COM0
19-25
Contents[7:0]
xx110100
xxxxx001
11110011
with ZoomingADC™ and LCD driver
C
lcd3
C
aux
LCD DISPLAY
vdd
External circuit
vss
IO_1[15:0]
IO_2[7:0]
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