35.6 Peripherals Power Consumption

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

Table 35-6. Peripherals Power Consumption⁽¹⁾
Operating conditions: V_DD = 3.0V T_A = 25°C OSCHF at 20 MHz with a prescaler division factor of six is used as clock source Device in Standby sleep mode
Symbol	Description	Min.	Typ.✝	Max. 85°C	Max. 125°C	Units	Conditions
I_{DD_WDT}	Watchdog Timer (WDT)	—	0.68	—	—	uA	Including I_{DD_OSC32K}
I_{DD_BG}	Bandgap	—	13	—	—	µA
I_{DD_VREF}	Voltage Reference (V_REF)	—	40	—	—	µA	ACREF enabled, V_REF = 2.048V Excluding I_{DD_BG}
I_{DD_BOD}	Brown-out Detector (BOD)	—	4.7	—	—	μA	Continuous mode Excluding I_{DD_BG}, OSCHF = 16 MHz
		—	0.5	—	—	μA	Sampling mode @128 Hz Including I_{DD_OSC32K} Excluding I_{DD_BG}, OSCHF = 16 MHz
		—	0.5	—	—	μA	Sampling mode @32 Hz Including I_{DD_OSC32K} Excluding I_{DD_BG}, OSCHF = 16 MHz
I_{DD_TCB}	16-bit Timer/Counter Type B (TCB)	—	20	—	—	μA	CLKSEL = DIV1 (CLK_PER) Periodic Interrupt mode
I_{DD_TCE}	16-bit Timer/Counter Type E (TCE)	—	40	—	—	μA	CLKSEL = DIV1 (fTCE = fCLK_PER) WGMODE = NORMAL
I_{DD_RTC}	Real-Time Counter (RTC)	—	0.81	—	—	μA	Including I_{DD_OSC32K} CTRLA.PRESCALER = `0x5` (DIV32)
I_{DD_OSC32K}	32.768 kHz Internal Oscillator (OSC32K)	—	0.42	—	—	uA
I_{DD_XOSC32K}	32.768 kHz Crystal Oscillator (XOSC32K)	—	1.1	—	—	µA	XOSC32KCTRLA.PMODE = `0x0` ESR = 50 KΩ C_L = 8 pF
		—	1.3	—	—	µA	XOSC32KCTRLA.PMODE = `0x1` ESR = 70 KΩ C_L = 12.5 pF
		—	5.6	—	—	µA	XOSC32KCTRLA.PMODE = `0x2` ESR = 100 KΩ C_L = 24 pF
I_{DD_OSCHF}	Internal High Frequency Oscillator (OSCHF)	—	92	—	—	µA
I_{DD_ADC}⁽²⁾	Analog-to-Digital Converter (ADC)	—	210	—	—	μA	CTRLC.REFSEL = `0x0` (V_DD) Excluding I_{DD_BG}
I_{DD_ADC}⁽²⁾	Analog-to-Digital Converter (ADC)	—	265	—	—	μA	CTRLC.REFSEL = `0x5` (Internal reference 2.048V) Including I_{DD_BG}
I_{DD_AC}	Analog Comparator (AC)	—	44	—	—	μA	Continuous mode CTRLA.HYSMODE = `0x2`
		—	4	—	—	μA	Event mode CTRLA.HYSMODE = `0x2`
		—	6.5	—	—	μA	Sampled mode = 1 KHz CTRLA.HYSMODE = `0x2` Including I_{DD_OSC32K}
		—	4.2	—	—	μA	Sampled mode = 128 Hz CTRLA.HYSMODE = `0x2` Including I_{DD_OSC32K}
I_{DD_PTC}	Peripheral Touch Controller (PTC)	—	50	—	—	μA	Device current consumption in Standby mode with PTC sampling every 20 ms, CLK_ADC 2 MHz, 16x accumulation
I_{DD_USART}	Universal Synchronous and Asynchronous Receiver and Transmitter (USART)	—	63	—	—	µA	USART Enabled @9600 Baud, Device in Idle sleep mode
I_{DD_SPI}	Serial Peripheral Interface (SPI)	—	14	—	—	μA	SPI Host @100 kHz, Device in Idle sleep mode
I_{DD_TWI}	Two-Wire Interface (TWI)	—	56	—	—	μA	TWI Host @100 kHz, Device in Idle sleep mode
I_{DD_TWI}	Two-Wire Interface (TWI)	—	46	—	—	μA	TWI Client @100 kHz, Device in Idle sleep mode
I_{DD_NVM_ERASE}	Flash Programming Erase	—	7	—	—	mA
I_{DD_NVM_WRITE}	Flash Programming Write	—	10	—	—	mA
✝ Data in the “Typ.” column is at T_A = 25°C and V_DD = 3.0V, unless otherwise specified. These parameters are not tested and are for design guidance only. Note: 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. Average power consumption with the following conditions: Single-ended 10-bit ADC ADC active in Free Running mode CLK_ADC = 1 MHz Device in Idle sleep mode