EFM32G200F64 Energy Micro, EFM32G200F64 Datasheet - Page 332

• Manufacturer Part Number: EFM32G200F64
• Description: MCU 32BIT 64KB FLASH 32-QFN
• Manufacturer: Energy Micro
• Series: Geckor

Specifications of EFM32G200F64

• 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: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K 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: 16 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

24.3 Functional Description
24.3.1 Warm-up Time
24.3.2 Response Time
2010-09-06 - d0001_Rev1.00
An overview of the VCMP is shown in Figure 24.1 (p. 332) .
Figure 24.1. VCMP 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 negative input voltage, the digital output is high and vice versa.
The output of the comparator can be read in the VCMPOUT bit in VCMP_STATUS. Configuration
registers should only be changed while the comparator is disabled.
VCMP is enabled by setting the EN bit in VCMP_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 HFPERCLK cycles, set in WARMTIME, which should be set to
at least 10 µs. When the comparator is enabled and warmed up, the VCMPACT bit in VCMP_STATUS
will be set to indicate that the comparator is active.
As long as the comparator is not enabled or not warmed up, VCMPACT will be cleared and the
comparator output value is set to the value in INACTVAL in VCMP_CTRL.
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.
There is a delay from when the actual input voltage changes polarity, to when the output toggles. This
period is called the response time and can be altered by increasing or decreasing the bias current to the
comparator through the BIAS and HALFBIAS fields in VCMP_CTRL as shown in Table 24.1 (p. 332)
. Setting a lower bias current will result in lower power consumption, but a longer response time.
Table 24.1. Bias Configuration
BIAS
0b0000
0b0001
0b0010
0b0011
0b0100
0b0101
V
DD
TRIGLEVEL
Scaler
BIASPROG
HALFBIAS
HYSTEN
EN
HALFBIAS=0
0.1
0.2
0.4
0.6
0.8
1.0
Warm -up
counter
LPREF
1.25V
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332
INACTVAL
VCMPACT
1
0
Read/Write registers
Read only register
Bias Current (µA)
HALFBIAS=1
0.05
0.1
0.2
0.3
0.4
0.5
Warm up interrupt
Edge interrupt
PRS
VCMPOUT
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