EDGE4707B View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'EDGE4707B' PDF : 25 Pages View PDF
Edge4707B
TEST AND MEASUREMENT PRODUCTS
Circuit Description (continued)
IVMON
Force Current Mode
IVMON is a real time analog voltage output which tracks
the sensed parameter.
In the MV mode, the output voltage displayed at IVMON is
a 1:1 mapping of the SENSE voltage. In the MI mode,
IVMON follows the equation:
IVMON = I(measured) * REXT
Using nominal values for the external resistors (RA, RB,
RC, and RD), a voltage at IVMON of +2V corresponds to
Imax and –2V corresponds to Imin of the selected current
range.
The IVMON pin can also be placed into a high impedance
state by using the DISABLE input (see Table 3).
In the FI mode (FV/FI* = 0), IVIN is a high impedance
analog voltage input that is converted into a current at
the FORCE pin using the following relationship:
Forced Current = IVIN / REXT
(Positive current is defined as current flowing out of the
FORCE pin.) The IVIN input voltage range and forced cur-
rent (at FORCE) can be seen in Table 4.
IVIN
+2V
0V
–2V
Corresponding
Forced Current
Imax (full scale)
0
Imin (full scale)
Table 4.
Disable
1
0
0
MI / MV* Sensed Parameter
X
High Impedance
0
Measured Voltage
1
Measured Current
Table 3.
Measure Voltage Mode
In the MV mode (MI/MV* = 0), DUT voltage is measured
via the SENSE input pin. Note that EXT_SENSE_SEL = 0
when the Edge4707B SENSE is used. This measured
voltage is also tested with the on-board window compara-
tor.
Force Voltage Mode
Comparator
In the FV mode (FV/FI* = 1), VINP is a high impedance
analog voltage input that maps directly to the voltage forced
at the FORCE pin.
Measure Current Mode
The Edge4707B features an on-board window compara-
tor which provides two-bit measurement range classifica-
tion. IVMAX and IVMIN are high impedance analog inputs
that establish the upper and lower thresholds for the win-
dow comparator.
In the MI mode (MI/MV* = 1), a current monitor is
connected in series with the PMU forcing amplifier. This
monitor generates a voltage that is proportional to the
current passing through it, and is brought out to IVMON.
This voltage (corresponding to the measured current) is
also tested by the on-board window comparator.
In the MI mode, an I/V MAX input of +2V will set the
upper threshold of the window comparator to a voltage
corresponding to +FSC (full-scale current), and an I/V MIN
input of –2V will set the lower threshold to a voltage
corresponding to –FSC (positive current is defined as
current flowing out of the PMU).
DUTGTL the DUTLTH are LVTTL compatible outputs which
indicate the range of the measured parameter in relation
to IVMIN and IVMAX. Comparator functionality is sum-
marized in Table 5 for MI Mode and Table 6 for MV mode.
Revision 3 / December 18, 2002
7
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