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Assembled Board with an external supply current limited, turn on the DC input power; Check DC in to 3.3v
measure DCtoDC converter 3.3v out, value, ripple/noise. Record DC into 3.3v ISK board
T3-2
Assembled Board, DC In applied, release PMIC NRST high, EN1 high, while keeping IWR6843 NRST low; Check DC out of PMIC 1.24v, 1.8v, 1.0v (if LDO used), 3.3v are within 2.5% of set point, use oscilloscope measure ripple, noise
measure PMIC output set point, ripple and noise; record DC current input as reset IWR current
T3-6
Power up the IWR device in SOP mode 2 measure the VBAP voltage on B10 ball
Make sure the VBGAP voltage is ~0.9V
T3-7
measure the clock frequency on the CLKP pin, also CLKM if connected to crystal
The frequency should be 40Mhz
T3-8
measure the WARM_RESET output, should be 6-8ms logic 1-> 0 at nRESET 0->1, Also check nERROR out = '1'
see power sequence, should be 1->0->1
T3-9
Measure the voltages on the "1p4V_APLL" and 1p4V_SYNTH" pins.
The voltages on both the pins should be ~1.4V
T3-10
Using Radar Studio configure the device with the desired chirp and frame configuration; Start the chirping with infinite number of frames ; Measure the voltage on the "VOUT_PA" pin
你看，我的复位高电平，只有1.32V。nRST的复位无效电平是1.57V，是不是我的复位上拉太弱，导致复位信号高电平达不到3.0V？