35.6 Peripherals Power Consumption

Use the table below to calculate the additional current consumption for the different I/O peripherals in the various operating modes. Some peripherals will request the clock to be enabled when operating in STANDBY. Refer to the peripheral section for further information.

Table 35-6. Peripherals Power Consumption(1)
Operating conditions:
  • VDD = 3.0V
  • TA = 25°C
  • OSCHF at 20 MHz with a prescaler division factor of six used as clock source
  • Device in Standby sleep mode
Symbol Description Min. Typ.✝ Max. 85°C Max. 125°C Unit Conditions
IDD_WDT Watchdog Timer (WDT) 270 nA 32.768 kHz internal oscillator
IDD_VREF Voltage Reference (VREF) µA
µA
µA
IDD_BOD Brown-out Detector (BOD) 14 μA Brown-out Detect (BOD) continuous
0.60 μA Brown-out Detect (BOD) sampling @128 Hz, including IDD_OSC32K
0.42 μA Brown-out Detect (BOD) sampling @32 Hz, including IDD_OSC32K
IDD_TCA 16-bit Timer/Counter Type A (TCA) 38 μA Device in Idle sleep mode
IDD_TCB 16-bit Timer/Counter Type B (TCB) 19 μA
IDD_RTC Real-Time Counter (RTC) 0.6 μA 32.768 kHz internal oscillator (OSC32K)
IDD_OSC32K 32.768 kHz Internal Oscillator (OSC32K) 270 nA
IDD_XOSC32K 32.768 kHz Crystal Oscillator (XOSC32K) µA
IDD_OSCHF Internal High Frequency Oscillator (OSCHF) µA
IDD_XOSCHF High Frequency Crystal Oscillator (XOSCHF) µA
IDD_ADC Analog-to-Digital Converter (ADC) 270 μA

CLK_ADC = 1 MHz,

device in Idle sleep mode

IDD_AC Analog Comparator (AC) 160 μA

CTRLA.POWER = 0x0,

device in Idle sleep mode

μA

CTRLA.POWER = 0x1,

device in Idle sleep mode

110 μA

CTRLA.POWER = 0x2,

device in Idle sleep mode

IDD_DAC Digital-to-Analog Converter (DAC) 104 μA

VDACREF = 1.024 V,

device in Idle sleep mode

125 μA

VDACREF = 4.096 V,

device in Idle sleep mode

98 µA

VDACREF = VDD,

device in Idle sleep mode

IDD_USART Universal Synchronous and Asynchronous Receiver and Transmitter (USART) µA USART Enabled @9600 Baud
IDD_SPI Serial Peripheral Interface (SPI) 7 μA

SPI Host @100 kHz,

device in Idle sleep mode

IDD_TWI Two-Wire Interface (TWI) 27 μA

TWI Host @100 kHz,

device in Idle sleep mode

21 μA

TWI Client @100 kHz,

device in Idle sleep mode

IDD_NVM_ERASE Flash Programming Erase 1.5 mA
IDD_NVM_WRITE Flash Programming Write 3.0 mA

Data in the “Typ.” column is at TA = 25°C and VDD = 3.0V unless otherwise specified. These parameters are not tested and are for design guidance only.

Note:
  1. The module's current consumption only. To calculate the total internal power consumption of the microcontroller, add the power consumption values of all the peripherals and the clock sources used to the base power consumption given in 35.5 Power Consumption.
  2. Average power consumption with ADC active in Free Running mode.