EFM32WG990 Datasheet, PDF (52/80 Pages) List of Unclassifed Manufacturers – The EFM32 MCUs are the world’s most energy friendly microcontrollers.

3.15 LCD
Preliminary
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Table 3.20. LCD
Symbol
f_LCDFR
NUM_SEG
V_LCD
I_LCD
I_LCDBOOST
V_BOOST
Parameter
Condition
Min
Typ
Max
Unit
Frame rate
30
200 Hz
Number of segments sup-
ported
34×8
seg
LCD supply voltage range Internal boost circuit enabled
2.0
3.8 V
Steady state current con-
sumption.
Display disconnected, stat-
ic mode, framerate 32 Hz, all
segments on.
Display disconnected,
quadruplex mode, framer-
ate 32 Hz, all segments on,
bias mode to ONETHIRD in
LCD_DISPCTRL register.
250
nA
550
nA
Steady state Current contri-
bution of internal boost.
Internal voltage boost off
Internal voltage boost on,
boosting from 2.2 V to 3.0 V.
0
µA
8.4
µA
VBLEV of LCD_DISPCTRL
register to LEVEL0
3.0
V
VBLEV of LCD_DISPCTRL
register to LEVEL1
3.08
V
VBLEV of LCD_DISPCTRL
register to LEVEL2
3.17
V
Boost Voltage
VBLEV of LCD_DISPCTRL
register to LEVEL3
VBLEV of LCD_DISPCTRL
register to LEVEL4
3.26
V
3.34
V
VBLEV of LCD_DISPCTRL
register to LEVEL5
3.43
V
VBLEV of LCD_DISPCTRL
register to LEVEL6
3.52
V
VBLEV of LCD_DISPCTRL
register to LEVEL7
3.6
V
The total LCD current is given by Equation 3.3 (p. 52) . 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)
3.16 Digital Peripherals
Table 3.21. Digital Peripherals
Symbol
I_USART
Parameter
USART current
I_UART
UART current
Condition
Min
USART idle current, clock en-
abled
UART idle current, clock en-
abled
Typ
Max
7.5
5.63
Unit
µA/
MHz
µA/
MHz
2013-05-06 - EFM32WG990FXX - d0203_Rev1.10
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