XE8000EV110 Semtech, XE8000EV110 Datasheet - Page 161

• 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

19.5.4
The different voltages used in the LCD driver can be generated in several ways. Depending on the selected
multiplexing scheme, the LCD display driver needs 2, 3 or 4 different voltages.
The reference voltage can be derived from an internal 1.2V band gap reference or from an externally supplied
voltage. The circuit also contains a voltage multiplier/divider that can be configured to generate a 1/2 bias or a 1/3
bias. This multiplier/divider needs external capacitors. Instead of the internal multiplier/divider, an external resistive
ladder can be used. The use of the internal circuitry will in most applications give the lowest power solution.
The voltages V0, V1 and V2 are connected internally in the circuit. The voltage V3 is not connected internally but
externally by short-circuiting the pins pad_lcd_vr1 and pad_lcd_vr2 to pad_vgen_v3.
The voltages used in the LCD driver for the different multiplexing schemes are given in Table 19-22.
© Semtech 2006
LcdMux
00
00
01
01
10
10
11
11
Voltage generation
LcdMux
Table 19-18. LCD driver source frequency selection
LcdFreq
00
01
10
11
Table 19-21. Minimal and maximal Frame Rate
00
11
00
11
00
11
00
11
Table 19-19. LCD driver frequency division
LcdDivFreq
LcdFreq
XE8802 Sensing Machine Data Acquisition MCU
000
001
010
011
100
101
110
111
Table 19-20. LCD multiplexing
00
01
10
11
multiplexing scheme
direct drive
19-17
1:2
1:3
1:4
LcdDivFreq
with ZoomingADC™ and LCD driver
111
000
111
000
111
000
111
000
f
LCD
1048
2048
4096
512
div
1
2
3
4
5
6
7
8
[Hz]
mux
1
2
3
4
FR [Hz]
682.7
2048
1024
10.6
512
32
16
8
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