4
HARDWARE CONTROL INTERFACE
Multi-Function Pins
The Hardware Control Interface (JP9) provides access to
the Multi-Function (MF) pins which decode 4-level supply
voltages to establish two independent settings per pin. The
first setting determines chip address. The second setting
determines configuration of the LXT970A.
Input Voltage Levels
The 4-level inputs referred to as V
MF
1, V
MF
2, V
MF
3 and
V
MF
4 are shown in Table 3. To select an Input Level place
a jumper on the appropriate pins as shown in Figure 1. The
4-level input pins (V
MF
1, V
MF
2, V
MF
3 and V
MF
4) are
identical for each Multi-Function (MF) section.
Figure 1: Hardware Control Interface Jumper Placement
Table 3:
MF Pins Input Voltage Levels
Parameter
Symbol
Min
Max
Units
Input Voltage Level 1
V
MF
1
Vcc - 0.5
-
V
Input Voltage Level 2
V
MF
2
(Vcc/2) + 0.5
Vcc - 1.2
V
Input Voltage Level 3
V
MF
3
1.2
Vcc/2 - 0.5
V
Input Voltage Level 4
V
MF
4
-
0.5
V
pin 49
pin 50
pin 1
pin 2
MF0
MF1
MF2
MF3
MF4
CFG0
FDE
CFG1
TRST
MDDIS
V
MF
1
V
MF
2
V
MF
3
V
MF
4
