Texas Instruments SmartRF06, Руководство пользователя, Страница: 27 / 46

User’s Guide
SWRU321A
– May 2013
Page 27/32
6.12 Current Measurement
The SmartRF06EB provides two options for easy measurements of the current consumption of a
mounted EM. The following sections describe these two options in detail.
6.12.1 High-side current sensing
The SmartRF06EB comes with a current sensing unit for measuring the current consumption of
the mounted EM (Figure 20). The current sensi
ng setup is “high-side”, that is, it measures the
current going to the mounted EM. The current is converted to a voltage, available at the
CURMEAS_OUTPUT test point (TP11), located near the right edge of the SmartRF06EB. Using
the SmartRF06EB together with for example an oscilloscope makes it easy to measure the EM
current consumption as a function of time.
The relationship between the voltage measured at CURMEAS_OUTPUT, V
CURMEAS
, and the EM
current consumption, I
EM
, is given by Equation 1 below.
15
V
I
CURMEAS
EM
(1)
G = 100
0.15 Ohm
To EM
I
EM
V
CURMEAS
Figure 20
– Simplified schematic of high-side current sensing setup
6.12.2 Current Measurement Jumper
SmartRF06EB has a current measurement header, J503, for easy measurement of EM current
consumption. Header J503 is located on the upper right hand side of the EB. By replacing the
jumper with an ammeter, as shown in Figure 21, the current consumption of the mounted EM can
be measured.
Figure 21
– Measuring current consumption using jumper J503