E4257ALPT Semtech, E4257ALPT Datasheet - Page 12

• Manufacturer Part Number: E4257ALPT
• Manufacturer: Semtech

Specifications of E4257ALPT

• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

Control Inputs
All control inputs are CMOS compatible with characteristics
as defined in the “Digital Inputs” section of the specification
table.
FV/FI* is a digital input which determines whether the
PMU forces current or voltage, and MI/MV* is an Digital
input which determines whether the PMU measures current
or voltage. FV/FI* and MI/MV* are independent for each
channel.
HiZ is a digital input that is used to place the PMU’s force
amp into a high impedance state. Table 1 describes the
modes of operation related to these three input pins.
RS0 and RS1 are digital inputs to an internal analog MUX
which selects an external resistor corresponding to a
desired current range. The truth table for RS0 and RS1,
along with the associated external resistor values and
current ranges, is shown in Table 2. RS0 and RS1 are
independent for each channel of the E4287 and E4257.
RS0 and RS1 for each channel should be connected
together externally on the E4237.
TEST AND MEASUREMENT PRODUCTS
Circuit Description (continued)
2005 Semtech Corp. / Rev. 5, 11/30/05
R
H
S
0
0
1
1
1
0
0
0
0
Z i
0
R
S
0
1
1
0
1
F
V
F /
X
0
0
1
1
R
a
* I
D
n
A
B
C
g
e
M
/ I
C
M
X
0
1
0
1
r u
±
±
e r
±
V
±
(
4
M
4
*
4
t n
4
0
Table 1.
Table 2.
0
0
a
0
m
R
) x
m
µ
H
F
F
F
F
µ
A
a
A
A
A
r o
r o
r o
r o
n
g i
g
h
e c
e c
e c
e c
e
I
m
M
C
C
V
V
N "
l o
l o
p
r u
r u
o
R
R
e
R
a t
a t
o
d
e r
e r
R
B
A
d
m
D
e
C
g
g
a
n
n
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=
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a
1
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2 .
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4 .
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u s
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t a
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12
2
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8
8
7
7
SELCOMP is a digital input pin that is used to switch
external capacitance in parallel with the E42X7’s internal
compensation in order to stabilize the force amplifier (see
Figure 1) in situations where a large capacitive loading
condition exists on the FORCE pin (such as during system
calibration). SELCOMP functionality is illustrated in Table
3.
SELIPMU is a digital input that is used to change the
connectivity of the FORCE/SENSE pair of each channel
such that the force amplifier’s output/feedback is routed
directly to the FORCE/SENSE pins or through an ~4.5K
integrated pull-up resistance path. SELIPMU functionality
is described in Table 4.
SELEPMU is a digital input that is used to connect an
external (system) PMU to FORCE/SENSE pins as may be
done during calibration of the device in a typical ATE
application. SELEPMU functionality is described below in
Table 5.
S
E
L
S
P I
0
1
E
C L
M
0
1
U
O
M
P
Table 4. SELIPMU Functionality
F
F
V F
M
F
p
a
r o
O
O
n i
m
o
F /
R
R
e c
e d
p
h t
C
C
E4237/E4257/E4287
* I
f i l
E
E
o r
=
r e i
a
s
F
m
c e
p
a
u
1
r o
n i
m
h g
F
p
o c
o i t
n a
e c
o
f i l
p
h t
t n
f i l
c r
~
) n
r e i
d
o r
r e i
l o r
A
Table 3.
4
n I
e
H
m
u
o
0
e t
Z i
t s
A
h g
u
o
p
m
n r
=
p t
u
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e h
p t
r
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l p
~
l a
0
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s e
r e
e t
t u
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4
F
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+
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