NUC130LE3CN Nuvoton Technology Corporation of America, NUC130LE3CN Datasheet - Page 468

• Manufacturer Part Number: NUC130LE3CN
• Description: IC MCU 32BIT 128KB FLASH 48LQFP
• Manufacturer: Nuvoton Technology Corporation of America
• Series: NuMicro™ NUC100r

Specifications of NUC130LE3CN

• Core Processor: ARM Cortex-M0
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: CAN, I²C, IrDA, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
• Number Of I /o: 35
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Eeprom Size: -
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 2.5 V ~ 5.5 V
• Data Converters: A/D 8x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LQFP
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

5.16.4 Functional Description
5.16.4.1 Self-Calibration
5.16.4.2 ADC Clock Generator
The A/D converter operates by successive approximation with 12-bit resolution. This A/D
converter equips with self calibration function to minimize conversion error, user can write 1 to
CALEN bit in ADCALR register to enable calibration function, while internal calibration is finished
the CAL_DONE bit will be set to 1 by hardware. The ADC has three operation modes: single
mode, single-cycle scan mode and continuous scan mode. When changing the operating mode or
analog input channel, in order to prevent incorrect operation, software must clear ADST bit to 0 in
ADCR register.
When chip power on or switch ADC input type between single-end input and differential input, it
needs to do ADC self calibration to minimize the conversion error. User can write 1 to CALEN bit
of ADCALR register to start the self calibration. It needs 127 ADC clocks to complete the
calibration and the CAL_DONE bit will be set to 1 by hardware. The detail timing is shown as
below:
The maximum sampling rate is up to 700K SPS. The ADC engine has four clock sources selected
by 2-bit ADC_S (CLKSEL[3:2]), the ADC clock frequency is divided by an 8-bit prescaler with the
formula:
The ADC clock frequency = (ADC clock source frequency) / (ADC_N+1);
where the 8-bit ADC_N is located in register CLKDIV[23:16].
If the clock source is from HCLK, the ADC_N can’t be 0. In generally, software can set ADC_S
and ADC_N to get 16 MHz or slightly less.
NuMicro™ NUC130/NUC140 Technical Reference Manual
CAL_DONE
ADC_CLK
CAL_EN
Figure 5-100 ADC Converter Self-Calibration Timing Diagram
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Publication Release Date: June 14, 2011
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Revision V2.01