EFM32G200F16 Energy Micro, EFM32G200F16 Datasheet - Page 77

• 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

9.3.3 Brown-Out Detector Reset (BOD)
9.3.4 RESETn pin Reset
9.3.5 Watchdog Reset
9.3.6 Lockup Reset
2010-09-06 - d0001_Rev1.00
threshold voltage is reached, the EFM32G is kept in reset state. The operation of the POR is illustrated
in Figure 9.2 (p. 77) , with the active low POWERONn reset signal. The reason for the “unknown”
region is that the corresponding supply voltage is too low for any reliable operation.
Figure 9.2. RMU Power-on Reset Operation
The EFM32G has 2 brownout detectors, one for the unregulated 3.0 V power and one for the internal 1.8
V power. The BODs are constantly monitoring the voltages. Whenever the voltage is below the VBODthr
value (see Electrical Characteristics for details), the corresponding active low BROWNOUTn line is held
low. The BODs also include hysteresis, which prevents instability in the corresponding BROWNOUTn
line when the supply is crossing the VBODthr limit. The operation of the BOD is illustrated in Figure 9.3 (p.
77) . The “unknown” regions are handled by the POR module.
Figure 9.3. RMU Brown-out Detector Operation
Forcing the RESETn pin low generates a reset of the EFM32G. The RESETn pin includes an on-chip pull-
up resistor, and can therefore be left unconnected if no external reset source is needed. Also connected
to the RESETn line is a filter which prevents glitches from resetting the EFM32G.
The Watchdog circuit is a timer which (when enabled) must be cleared by software regularly. If software
does not clear it, a Watchdog reset is activated. This functionality provides recovery from a software
stalemate. Refer to the Watchdog section for specifications and description. A Watchdog reset does not
reset the Debug Interface. This allows an active debug session to continue in case of a Watchdog reset.
A Cortex-M3 lockup is the result of the core being locked up because of an unrecoverable exception
following the activation of the processor’s built-in system state protection hardware.
BROWNOUTn
VBODthr
V
DD
V
POWERONn
Unknown
VPORthr
V
Unknown
VBODhyst
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77
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DD
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VBODhyst
www.energymicro.com
Unknown
tim e