EFM32G200F16 Energy Micro, EFM32G200F16 Datasheet - Page 344

• 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

25.3.6 Programming of Bias Current
25.3.7 ADC Modes
25.3.7.1 Single Sample Mode
25.3.7.2 Scan mode
2010-09-06 - d0001_Rev1.00
The bias current of the bandgap reference and the ADC comparator can be scaled by the BIASPROG,
HALFBIAS and COMPBIAS bit fields of the ADCn_BIASPROG register. The BIASPROG and HALFBIAS
bitfields scale the current of ADC bandgap reference, and the COMPBIAS bits provide an additional bias
programming for the ADC comparator as illustrated in Figure 25.4 (p. 344) .
Figure 25.4. ADC Bias Programming
The minimum value of the BIASPROG and COMPBIAS bitfields of the ADCn_BIASPROG register
(i.e. BIASPROG=0b0000, COMPBIAS=0b0000) represent the minimum bias currents. Similarly
BIASPROG=0b1111 and COMPBIAS=0b1111 represent the maximum bias currents. Additionally, the
bias current defined by the BIASPROG setting can be halved by setting the HALFBIAS bit of the
ADCn_BIASPROG register.
The bias current settings should only be changed while the ADC is disabled.
The ADC contains two separate programmable modes, one single sample mode and one scan mode.
Both modes have separate configuration and result registers and can be set up to run only once per
trigger or repetitively. The scan mode has priority over the single sample mode. However, if scan
sequence is running, a triggered single sample will be interleaved between two scan samples.
The single sample mode can be used to convert a single sample either once per trigger or repetitively.
The configuration of the single sample mode is done in the ADCn_SINGLECTRL register and the
results are found in the ADCn_SINGLEDATA register. The SINGLEDV bit in ADCn_STATUS is set
high when there is valid data in the result register and is cleared when the data is read. The single
mode results can also be read through ADCn_SINGLEDATAP without SINGLEDV being cleared. DIFF
in ADCn_SINGLECTRL selects whether differential or single ended inputs are used and INPUTSEL
selects input pin(s).
The scan mode is used to perform sweeps of the inputs. The configuration of the scan sequence is done
in the ADCn_SCANCTRL register and the results are found in the ADCn_SCANDATA register. The
SCANDV bit in ADCn_STATUS is set high when there is valid data in the result register and is cleared
when the data is read. The scan mode results can also be read through ADCn_SCANDATAP without
SCANDV being cleared. The inputs included in the sequence are defined by a the mask in INPUTMASK
in ADCn_SCANCTRL. When the scan sequence is triggered, the sequence samples all inputs that are
included in the mask, starting at the lowest pin number. DIFF in ADCn_SCANCTRL selects whether
single ended or differential inputs are used.
Reference
Current
Single ended measurements with the external differential reference are not supported.
BIASPROG
HALFBIAS
reference
bandgap
Internal
COMPBIAS
Com parator
ADC
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