EFM32TG210F32 Energy Micro, EFM32TG210F32 Datasheet - Page 386

• Manufacturer Part Number: EFM32TG210F32
• Description: MCU 32BIT 32KB FLASH 32-QFN
• Manufacturer: Energy Micro
• Series: Tiny Geckor

Specifications of EFM32TG210F32

• 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: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K 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: EFM32
• Core: ARM Cortex-M3
• Data Bus Width: 32 bit
• Data Ram Size: 32 KB
• Interface Type: UART, I2C, SPI
• Maximum Clock Frequency: 32 MHz
• Number Of Programmable I/os: 17
• Number Of Timers: 1
• Operating Supply Voltage: 1.8 V to 3.8 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Processor To Be Evaluated: EFM32TG210
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

24.3.4.2 Temperature Measurement
24.3.5 Reference Selection
2010-12-21 - d0034_Rev0.90
The RC input filter configuration is given in Figure 24.3 (p. 386) . The resistance and capacitance values
are given in the electrical characteristics for the device, named R
Figure 24.3. ADC RC Input Filter Configuration
The ADC includes an internal temperature sensor. This sensor is characterized during production and the
temperature readout from the ADC at production temperature, ADC0_TEMP_0_READ_1V25, is given
in the Device Information (DI) page. The production temperature, CAL_TEMP_0, is also given in this
page. The temperature gradient, TGRAD_ADCTH (mV/degree Celsius), for the sensor is found in the
datasheet for the devices. By selecting 1.25 V internal reference and measuring the internal temperature
sensor with 12 bit resolution, the temperature can be calculated according to the following formula:
ADC Temperature Measurement
Note
The reference voltage can be selected from these sources:
• 1.25 V internal bandgap
• 2.5 V internal bandgap
• V
• 5 V internal differential bandgap
• External single ended input from pin 6
• Differential input, 2x(pin 6 - pin 7)
• Unbuffered 2xV
• The 2.5 V reference needs a supply voltage higher than 2.5 V.
• The differential 5 V reference needs a supply voltage higher than 2.75 V.
Since the 2xV
and more susceptible to supply noise. The V
mode.
If a differential reference with a larger range than the supply voltage is combined with single ended
measurements, for instance the 5 V internal reference, the full ADC range will not be available because
the maximum input voltage is limited by the maximum electrical ratings.
Note
DD
Input
The minimum acquisition time for the temperature reference is found in the electrical
characteristics for the device.
DD
differential reference is unbuffered, it is directly connected to the ADC supply voltage
T
DD
CELSIUS
ADC_result)×Vref/(4096×TGRAD_ADCTH)
=CAL_TEMP_0-(ADC0_TEMP_0_READ_1V25-
R
C
ADC
DD
reference is buffered both in single ended and differential
...the world's most energy friendly microcontrollers
386
ADCFILT
and C
www.energymicro.com
ADCFILT
respectively.
(24.2)