Table 5.1. Radio States
State/Mode Response Time
TX RX
Shutdown 15 ms 15 ms
Sleep 500 μs 500 μs
SPI Active 340 μs 340 μs
Ready 110 μs 120 μs
TX Tune 60 μs 125 μs
RX Tune 120 μs 84 μs
TX N/A 132 μs
RX 120 μs N/A
Note: While the chip is in sleep state, the NSEL pin has to stay in high state. If the host processor is not able to provide this during
sleep, a pull-up resistor can be necessary on the NSEL pin.
Shutdown = 30nA
10ms @ 2mA
5ms @ 1.8mA Ready = 1.8mA
5.5ms
@
2mA
POR=1ms @ 1.25mA
Reg. inrush = 5μs @ 2mA
Power Up Configuration
RX Chain calibration
400μs @ 10mA
Figure 5.3. Supply Current versus Time Diagram from Shutdown to RF Initialized Ready State
AN954: Programming Guide for EFM8 and EZRadio ®
Radio Initialization
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