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MAX9951/MAX9952
Dual Per-Pin Parametric
Measurement Units
16
Maxim Integrated
C1 = C2 = 0 allows for data transfer from the shift regis-
ter to the input register without transferring data to the
PMU register (unless
LOAD is low). This permits the
latching of data into the PMU register at a later time by
LOAD or subsequent command. Table 4 summarizes
the possible control and address bit combinations.
When asynchronously latching only one PMU’s data,
the input register of the other PMU maintains the same
data. Therefore, loading both PMU registers would
update the one PMU with new data while the other PMU
remains in its current state.
Mode Selection
Four bits from the control word select between the vari-
ous force-measure modes of operation. INMODE
selects between the two input analog control voltages.
FMODE selects whether the PMU forces a voltage or a
current. MMODE selects whether the DUT current or
DUT voltage is directed to MSR_.
HI-ZFORCE places
the driver amplifier in a high-output-impedance state.
Table 5 describes the various force and measure
modes of operation.
Table 4. PMU Operation Using Control and Address Bits
A2
A1
C2
C1
PMU-A OPERATION
PMU-B OPERATION
0000
NOP: data just passes through
0001
Transfer PMU register A from input register A.
NOP.
0010
NOP.
Transfer PMU register B from input register B.
0011
Transfer PMU register A from input register A.
Transfer PMU register B from input register B.
0100
Transfer input register A from shift register.
NOP.
0101
Transfer input register A and PMU register A
from shift register.
NOP.
0110
Transfer input register A from shift register.
Transfer PMU register B from input register B.
0111
Transfer input register A and PMU register A
from shift register.
Transfer PMU register B from input register B.
1000
NOP.
Transfer input register B from shift register.
1001
Transfer PMU register A from input register A.
Transfer input register B from shift register.
1010
NOP.
Transfer input register B and PMU register B
from shift register.
1011
Transfer PMU register A from input register A.
Transfer input register B and PMU register B
from shift register.
1100
Transfer input register A from shift register.
Transfer input register B from shift register.
1101
Transfer input register A and PMU register A
from shift register.
Transfer input register B from shift register.
1110
Transfer input register A from shift register.
Transfer input register B and PMU register B
from shift register.
1111
Transfer input register A and PMU register A
from shift register.
Transfer input register B and PMU register B
from shift register.