EFM32G200F16 Energy Micro, EFM32G200F16 Datasheet - Page 321

• Manufacturer Part Number: EFM32G200F16
• Description: MCU 32BIT 16KB FLASH 32-QFN
• Manufacturer: Energy Micro
• Series: Geckor

Specifications of EFM32G200F16

• Core Processor: ARM® Cortex-M3™
• Core Size: 32-Bit
• Speed: 32MHz
• Connectivity: EBI/EMI, I²C, IrDA, SmartCard, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 24
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.8 V
• Data Converters: A/D 4x12b, D/A 1x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-VQFN Exposed Pad
• Processor Series: EFM32G200
• Core: ARM Cortex-M3
• Data Bus Width: 32 bit
• Data Ram Size: 8 KB
• Interface Type: I2C, UART
• Maximum Clock Frequency: 32 MHz
• Number Of Programmable I/os: 24
• Number Of Timers: 2
• Operating Supply Voltage: 1.8 V to 3.8 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

23.3 Functional Description
23.3.1 Warm-up Time
2010-09-06 - d0001_Rev1.00
• Comparator output direct on PRS
• Comparator output on GPIO through alternate functionality
An overview of the ACMP is shown in Figure 23.1 (p. 321) .
Figure 23.1. ACMP Overview
The comparator has two analog inputs, one positive and one negative. When the comparator is active,
the output indicates which of the two input voltages is higher. When the voltage on the positive input is
higher than the voltage on the negative input, the digital output is high and vice versa.
The output of the comparator can be read in the ACMPOUT bit in ACMPn_STATUS. It is possible to
switch inputs while the comparator is enabled, but all other configuration should only be changed while
the comparator is disabled.
The analog comparator is enabled by setting the EN bit in ACMPn_CTRL. When this bit is set, the
comparator must stabilize before becoming active and the outputs can be used. This time period is called
the warm-up time. The warm-up time is a configurable number of peripheral clock (HFPERCLK) cycles,
set in WARMTIME, which should be set to at least 10 µs. When the comparator is enabled and warmed
up, the ACMPACT bit in ACMPn_STATUS will indicate that the comparator is active. The output value
when the comparator is inactive is set to the value in INACTVAL in ACMPn_CTRL (see Figure 23.1 (p.
321) ).
An edge interrupt will be generated after the warm-up time if edge interrupt is enabled and the value set
in INACTVAL is different from ACMPOUT after warm-up.
One should wait until the warm-up period is over before entering EM2 or EM3, otherwise no comparator
interrupts will be detected. EM1 can still be entered during warm-up. After the warm-up period is
completed, interrupts will be detected in EM2 and EM3.
• Output inversion available
ACMPn_CH0
ACMPn_CH1
ACMPn_CH2
ACMPn_CH3
ACMPn_CH4
ACMPn_CH5
ACMPn_CH6
ACMPn_CH7
0000
1011
000
111
-
-
BIASPROG
HALFBIAS
FULLBIAS
HYSTSEL
POSSEL
NEGSEL
EN
V
DD_SCALED
VDDLEVEL
Warm -up
counter
Scaler
...the world's most energy friendly microcontrollers
321
V
2.5 V
1.25 V
INACTVAL
DD
ACMPACT
LPREF
1
0
GPIOINV
Read/Write registers
Read only registers
Warm up interrupt
Edge interrupt
Output to PRS
Output to GPIO
ACMPOUT
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