ST ST25RU3993-EVAL, User Manual, Page: 19 / 48

5.6.1 Analog test points
Table 17. Analog test point connections
Component: U5 Component: U2 Component: U3
Analog
test point
ST25RU3993
pin name
ST25RU3993
pin number
PA
pin name
PA
pin number
Power det.
pin name
Power det.
pin number
OSCO 30 - - - - ATP1
VCO (LF_CEXT) 45 - - - - ATP2
- - VBIAS 1 - - ATP3
- - - - OUT 7 ATP4
5.6.2 Supply voltage test points
Table 18. Supply voltage test points
5 V external supply 3V3 digital supply VSUP RF supply VPA power amplifier supply
P2 J5 J20 J21
Pin number Pin name Pin number Pin name Pin number Pin name Pin number Pin name
1 VBUS 1 GND 1 GND 1 GND
2 VBUS 2 3V3 2 VSUP 2 VPA
- - 3 3V3 3 VSUP 3 VPA
Supply voltage measurement
At the output of each of the three LDOs two test points are placed in order to conveniently measure the regulated
voltage of each voltage domain. A GND pad is placed directly next to the voltage test point to allow accurate
voltage measurements.
Example:
Figure 11. Connection a voltmeter to the supply voltage test points
Current Consumption Measurement
The current consumption flowing into each of the three voltage domains can be measured separately. To enable
this kind of measurement a 0 Ω resistor needs to be removed. Make sure to establish a connection again once
the measurement is done reverting to normal operation.
Example:
UM2353
Test points
UM2353 - Rev 2
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