11
ISOMET
The slave address for the digital I2C potentiometer is at 0101100. (AD0 = AD1 = 0)
Maximum resistance equates to maximum RF power.
The digital potentiometer value is non-volatile and will recall the last saved value on power-
up.
5V
+5V
24V
10T Pot (40MHz)
1
3
2
10k
560
R39
470
P82B715TD
1
2
6
7
8
4
3
5
n
c
1
Lx
Sy
Ly
Vc
c
G
nd
Sx
n
c
560
R38
470
47k
A
D
5
2
5
4
B
R
U
10
5
8
4
3
2
7
6
10
11
12
13
14
16
17
9
20
15
1
18
19
-WP
A1
AD0
A0
B0
B1
W1
Vss
A2
B2
W2
SCL
AD1
A3
SDA
Vdd
GNDd
W0
B3
W3
10T Pot (50MHz)
1
3
2
1
2
1
3
1
14
2
4
5
11
10
6
7
8
9
3
V
dd
G
n
d
A0
A1
en
S1
S2
S3
S4
D
nc
nc1
nc2
Vs
s
15 way D-Ty pe
8
15
7
14
6
13
5
12
4
11
3
10
2
9
1
560
10k
560
-
+
6
7
4
3
2
R_W-B = D/256
S0
LCL
GND
Control
Connector
(Inv erts)
I2C Buffer
LDA
S0
POT SELECT
INPUT
RF Level
Freq MOD
NC
S1
40MHz
50MHz
DO NOT 5V on the I2C Inputs, LDA (data IO) and LCL (clock)
The I2C signals are buffered using the bus extender chip P82B715 from NXP
To enable remote RF power control, connect pin 1 (S0) of the 15way D-type control driver connector
to a PLC compatible logic port and apply a high signal.
