36.6 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 36-6. 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) — 680 — — nA 32.768 kHz internal oscillator
IBG Bandgap — 18.5 — — µA
IDD_VREF Voltage Reference (VREF) — 55 — — µA

ACREF enabled, VREF = 2.048V

Excluding bandgap
IDD_BOD Brown-out Detector (BOD) — 14 — — μA

Brown-out Detect (BOD) continuous

Excluding bandgap
— 0.6 — — μA

Brown-out Detect (BOD) sampling @128 Hz, including IDD_OSC32K

Excluding bandgap
— 0.42 — — μA

Brown-out Detect (BOD) sampling @32 Hz, including IDD_OSC32K

Excluding bandgap
IDD_TCB 16-bit Timer/Counter Type B (TCB) — 23 — — μA
IDD_RTC Real-Time Counter (RTC) — 0.6 — — μA 32.768 kHz internal oscillator (OSC32K)
IDD_OSC32K 32.768 kHz Internal Oscillator (OSC32K) — 330 — — nA
IDD_XOSC32K 32.768 kHz Crystal Oscillator (XOSC32K) — 1.3 — — µA

LPMODE = Enabled

ESR=50 kOhm, CL = 12.5 pF
— 5.7 — — µA

LPMODE = Disabled

ESR=50 kOhm, CL = 12.5 pF
IDD_OSCHF Internal High Frequency Oscillator (OSCHF) — 90 — — µA
IDD_PLL Phase-Locked Loop (PLL) — 330 — — μA

PLL_MULFAC = 8x

device in Idle sleep mode
— 670 — — μA

PLL_MULFAC = 16x

device in Idle sleep mode
IDD_ADC(2) Analog-to-Digital Converter (ADC) — 280 — — μA ADC.REFSEL = VDD
— 400 — — μA ADC.REFSEL = Internal 2.048V
IDD_AC Analog Comparator (AC) — 147 — — μA

CTRLA.POWER = 0x0

device in Idle sleep mode
— 105 — — μA

CTRLA.POWER = 0x1

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) — 7.0 — — 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 — 7 — — mA
IDD_NVM_WRITE Flash Programming Write — 10 — — mA

✝ Unless otherwise specified, data in the “Typ.” column is at TA = 25°C and VDD = 3.0V . 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 Power Consumption.
  2. Average power consumption with the following conditions:
    • Single-ended 12-bit ADC
    • ADC active in Free Running Mode
    • CLK_ADC = 1 MHz
    • Device in Idle sleep mode