Silicon Laboratories UG524, User Manual

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2.2 Current Consumption
The operating current of the board greatly depends on the application. The table below attempts to give some indication of how different
features of the board contribute to the overall power consumption. Note that the numbers are taken from the data sheets for the devi-
ces. For a full overview of the conditions that apply for a specific number from a data sheet, the reader is encouraged to read the specif-
ic data sheet.
Table 2.1. Current Consumption
Parameter Symbol Condition Typ Unit
EFR32 Current Consump-
tion
1
I
EFR32
MCU current consumption in EM0 mode with all peripher-
als disabled (DC-DC converter at 3.0 V input and 1.8 V
output, 39 MHz crystal, CPU running Prime from flash at
25 ˚C) 33.9 µA/MHz
EM4, no BURTC, no LF oscillator 0.25 µA
Radio system current consumption in receive mode, active
packet reception (DC-DC converter at 3.0 V input and 1.8
V output, MCU in EM1 and all MCU peripherals disabled,
HCLK = 39 MHz, 1Mbit/s, 2GFSK, f = 2.4 GHz, VSCALE1
at 25 ˚C) 4.4 mA
Radio system current consumption in transmit mode (DC-
DC converter at 3.0 V input and 1.8 V output, MCU in
EM1P and all MCU peripherals disabled, HCLK = 39 MHz,
f = 2.4 GHz, CW, 10 dBm output power, VSCALE1 at 25
˚C) 20 mA
RH/Temp Sensor Current
Consumption
2
I
Si7021
Standby, -40 to +85˚C 0.06 µA
RH conversion in progress 150 µA
Temperature conversion in progress 90 µA
Peak I
DD
during I
2
C operations
3.5 mA
Hall Effect Sensor Current
Consumption
3
I
Si7210
Sleep mode at 3.3 V 50 µA
Average current for periodic activation at 3.3 V, sleep tim-
er enabled, 200 msec sleep time 0.4 µA
Conversion in progress at 3.3 V 5 mA
Microphone Current Con-
sumption
4,5
I
MIC
Sleep mode, f
s
less than 3.125 kHz 12 µA
Performance mode (V
DD
= 1.8 V) 490 µA
IMU Current Consumption
6
I
IMU
Full-chip sleep mode at 1.8 V supply 6 µA
Gyr Accelerometer 6-Axis low power mode, 100
Hz update rate at 1.8 V supply 1.9 mA
External Flash Current Con-
sumption
7
I
MX25R3235F
Deep Power-down at 1.8 V supply 7 nA
Standy at 1.8 V supply 5 µA
Program current (PP) at 1.8 V supply 3.5 mA
Ambient Light Sensor Cur-
rent Consumption
8
I
VEML6035
Shutdown at 1.8 V supply 0.5 µA
Operation mode at 1.8 V supply (ALS only) 170 µA
Pressure Sensor Current
Consumption
9
I
BMP384
Sleep current 2 µA
Peak current during pressure measurement 700 µA
Precise Voltage Reference I
ADC_VREF
Enabled at 3.3 V supply 127 µA
UG524: xG24 Dev Kit User's Guide
Specifications
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