EFM32WG840F128 Energy Micro, EFM32WG840F128 Datasheet - Page 44

• Manufacturer Part Number: EFM32WG840F128
• Description: ARM Microcontrollers - MCU 128kb flash 32kb RAM
• Manufacturer: Energy Micro

Specifications of EFM32WG840F128

• Rohs: yes
• Core: ARM Cortex M4F
• Processor Series: EFM32WG840
• Data Bus Width: 32 bit
• Maximum Clock Frequency: 48 MHz
• Program Memory Size: 128 KB
• Data Ram Size: 32 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 1.85 V to 3.8 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: QFN-64
• Mounting Style: SMD/SMT

3.15 LCD
3.16 Digital Peripherals
2012-09-11 - EFM32WG840FXX - d0195_Rev1.00
Table 3.20. LCD
The total LCD current is given by Equation 3.3 (p. 44) . I
Total LCD Current Based on Operational Mode and Internal Boost
Table 3.21. Digital Peripherals
Symbol
f
NUM
V
I
I
V
Symbol
I
I
LCDFR
LCD
LCDBOOST
USART
UART
LCD
BOOST
SEG
Parameter
Frame rate
Number of segments sup-
ported
LCD supply voltage range
Steady state current con-
sumption.
Steady state Current contri-
bution of internal boost.
Boost Voltage
Parameter
USART current
UART current
Preliminary
I
LCDTOTAL
Condition
Internal boost circuit enabled
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.
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
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
Condition
USART idle current, clock en-
abled
UART idle current, clock en-
abled
= I
LCD
...the world's most energy friendly microcontrollers
+ I
44
LCDBOOST
LCDBOOST
Min
Min
is zero if internal boost is off.
2.0
30
Typ
Typ
www.energymicro.com
20×8
3.08
3.17
3.26
3.34
3.43
3.52
5.63
250
550
8.4
3.0
3.6
7.5
0
Max
Max
200 Hz
3.8 V
Unit
seg
nA
nA
µA
µA
V
V
V
V
V
V
V
V
Unit
µA/
MHz
µA/
MHz
(3.3)