Philips pm2521 - Page 120

132
OQ0064 V-l
CONVERTOR (ADC)
ST2489
Specification
of inputs and outputs
Pin
no. Name
1
PROT
2 n.c.
3
D1
4
Ra
5
SI
6 Rb
7
1
8 1
9 Rb
10
S2
11 Ra
12 D2
13
Vss
14
1 in
15 Rs
16
1
ref
17
Rp
18
n.c.
19
n.c.
20
Vdd
21
n.c.
22
GND
23
Sin
24
So
Description
Protection input,
no connection
Drain input for device
1
.
Range a conversion resistor
(input sensitivity
0,1V).
Source input for device
1
.
Range b conversion resistor
(input sensitivity
IV).
Current
output.
Current output
Range b conversion resistor
(input
sensitivity IV).
Source
input for device
2.
Range
a
conversion resistor (input
sensitivity 0,1V).
Drain
input for
device 2.
Negative
supply voltage.
Current input.
Current setting resistor.
Adjustment reference
current.
Current reference
output.
Tc
setting
resistor.
Rp
determines
temperature coefficient,
no connection
no connection
Positive supply
voltage,
no
connection.
Supply Zero
^
Range
selecting input
(a or b).
Range selecting reference
input.
Sin So Ra
Rb Sensitivity ADC
0 1 X
0,1V
1 1
X IV