EFM32G Data Sheet
Electrical Characteristics
4.14 LCD
Table 4.18. LCD
Parameter
Symbol
fLCDFR
NUMSEG
VLCD
Test Condition
Min
30
Typ
—
Max
200
—
Unit
Hz
seg
V
Frame rate
Number of segments supported
LCD supply voltage range
—
4×40
—
Internal boost circuit enabled
2.0
—
3.8
—
Display disconnected, static mode,
framerate 32 Hz, all segments on.
250
nA
Display disconnected, quadruplex
mode, framerate 32 Hz, all seg-
ments on, bias mode to ONE-
THIRD in LCD_DISPCTRL regis-
ter.
—
550
—
nA
ILCD
Steady state current consumption.
Internal voltage boost off
—
—
0
—
—
µA
µA
Steady state Current contribution
of internal boost.
ILCDBOOST
Internal voltage boost on, boosting
from 2.2 V to 3.0 V.
8.4
VBLEV of LCD_DISPCTRL regis-
ter to LEVEL0
—
—
—
—
—
—
—
—
3.0
—
—
—
—
—
—
—
—
V
V
V
V
V
V
V
V
VBLEV of LCD_DISPCTRL regis-
ter to LEVEL1
3.08
3.17
3.26
3.34
3.43
3.52
3.6
VBLEV of LCD_DISPCTRL regis-
ter to LEVEL2
VBLEV of LCD_DISPCTRL regis-
ter to LEVEL3
VBOOST
Boost Voltage
VBLEV of LCD_DISPCTRL regis-
ter to LEVEL4
VBLEV of LCD_DISPCTRL regis-
ter to LEVEL5
VBLEV of LCD_DISPCTRL regis-
ter to LEVEL6
VBLEV of LCD_DISPCTRL regis-
ter to LEVEL7
The total LCD current is given by the following equation. ILCDBOOST is zero if internal boost is off.
= I + I
I
LCDTOTAL
LCD
LCDBOOST
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