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130
OQ0063
PROGRAMMABLE CURRENT
SOURCE
Specification of the inputs
and
outputs
of
the
000063
ST2485
1
rs
C
Cs
c
1
rc
c
Vss
C
C
.clock
C
C.clockc
RNG
B C
V
OUTc
C
COMP,
c
00
0063
18
1
^
0
1
rp
Cs
1
Rx
GNO
Vdd
RNG
A
RNG
C
-Vin
+Vin
/
Pin no.
1
2
3
4
5
6
7
8
g
10
11
12
13
14
15
16
17
18
Name
Description
Irs
Ref.
current
adjustment
Cs
Smoothing
Capacitor
Ire
1
Ref.
Common
Vss
Supply
C
clock
C
clock
RNG
B
Range B
V
out
Output
voltage
C
comp
C.
Compensation
-i-Vin
-t-
input
—Vin
—
input
RNG
C
Range
C
RNG A
Range
A
Vdd
Supply
GND
GROUND,^
1
out
Cs
Irp
With Rs
the
output
current can
be
adjusted.
Smoothing
capacitor for the
switched
currents.
Common
connection of Rs and Rp.
Negative
supply
voltage.
Capacitor
for
the
clock-oscillator.
Range information
(see
12,
13).
Output
of the
compensation
amplifier.
Compensation
capacitor
for the
compensation
amplifier.
+ and
—
input of the
compensation/protection
amplifier.
Compensation: With
the ampifier the current
consumption
of
the
ADC
is
compensated
during 12
measurements.
Protection:
With
the
amplifier
also
the
leak
current
through the
protection
diodes during 12
measurements
is
compensated.
Together with
signal
RNG
B
the
signals
determine
the
digital
range
information
from
the
jUP.
Range
Measuring
current
RNG
A
RNG
B
RNG
C
1
kl2
1mA
1
1
1
10 kl2
100
A
0
0
0
100
kl2
10
M
A
1
0
0
1Ml2
1
M
A
0
1
0
10M12
100
nA
1
1
0
Positive
supply
voltage.
Supply
zero
^
Output
current.
Smoothing
capacitor.
With
Rp
the temperature-coefficient of the reference current
is
determined.
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