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EFM32WG842 Datasheet, PDF (50/78 Pages) Silicon Laboratories – Operation from backup battery when main power drains out
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3.15 LCD
Table 3.20. LCD
...the world's most energy friendly microcontrollers
Symbol
fLCDFR
NUMSEG
VLCD
ILCD
ILCDBOOST
VBOOST
Parameter
Condition
Min
Frame rate
Number of seg-
ments supported
LCD supply voltage Internal boost circuit enabled
range
Display disconnected, stat-
ic mode, framerate 32 Hz, all
segments on.
Steady state current
consumption.
Display disconnected, quadru-
plex mode, framerate 32
Hz, all segments on, bias
mode to ONETHIRD in
LCD_DISPCTRL register.
Steady state Cur-
rent contribution of
internal boost.
Internal voltage boost off
Internal voltage boost on,
boosting from 2.2 V to 3.0 V.
VBLEV of LCD_DISPCTRL
register to LEVEL0
VBLEV of LCD_DISPCTRL
register to LEVEL1
VBLEV of LCD_DISPCTRL
register to LEVEL2
Boost Voltage
VBLEV of LCD_DISPCTRL
register to LEVEL3
VBLEV of LCD_DISPCTRL
register to LEVEL4
VBLEV of LCD_DISPCTRL
register to LEVEL5
VBLEV of LCD_DISPCTRL
register to LEVEL6
VBLEV of LCD_DISPCTRL
register to LEVEL7
Typ
30
Max
18×8
Unit
200 Hz
seg
2.0
3.8 V
250
nA
550
nA
0
µA
8.4
µA
3.02
V
3.15
V
3.28
V
3.41
V
3.54
V
3.67
V
3.73
V
3.74
V
The total LCD current is given by Equation 3.3 (p. 50) . ILCDBOOST is zero if internal boost is off.
Total LCD Current Based on Operational Mode and Internal Boost
ILCDTOTAL = ILCD + ILCDBOOST
(3.3)
2014-06-13 - EFM32WG842FXX - d0196_Rev1.40
50
www.silabs.com
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