EFM32G840F128 Datasheet, PDF (45/71 Pages) Silicon Laboratories – ARM Cortex-M3 CPU platform

3.14 LCD
Table 3.18. LCD
...the world's most energy friendly microcontrollers
Symbol
f_LCDFR
NUM_SEG
V_LCD
I_LCD
I_LCDBOOST
V_BOOST
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
4×40
Unit
200 Hz
seg
2.0
3.8 V
250
nA
550
nA
0
µA
8.4
µA
3.0
V
3.08
V
3.17
V
3.26
V
3.34
V
3.43
V
3.52
V
3.6
V
The total LCD current is given by Equation 3.3 (p. 45) . I_LCDBOOST is zero if internal boost is off.
Total LCD Current Based on Operational Mode and Internal Boost
I_LCDTOTAL = I_LCD + I_LCDBOOST
(3.3)
2013-11-22 - EFM32G840FXX - d0008_Rev1.71
45
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