MAX9951DCCB+D Datasheet MAX9951DCCB+D, MAX9952DCCB+, MAX9951FCCB+T | P16-P18

MAX9951/MAX9952

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.

Dual Per-Pin Parametric

Measurement Units

16 ______________________________________________________________________________________

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

0001Transfer PMU register A from input register A. NOP.

0010NOP. Transfer PMU register B from input register B.

0011Transfer PMU register A from input register A. Transfer PMU register B from input register B.

0100Transfer input register A from shift register. NOP.

0101

Transfer input register A and PMU register A

from shift register.

NOP.

0110Transfer 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.

1000NOP. Transfer input register B from shift register.

1001Transfer PMU register A from input register A. Transfer input register B from shift register.

1010NOP.

Transfer input register B and PMU register B

from shift register.

1011Transfer PMU register A from input register A.

Transfer input register B and PMU register B

from shift register.

1100Transfer 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.

1110Transfer 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.

Current-Range Selection

Three bits from the control word, RS0, RS1, and RS2,

control the full-scale current range for either FI (force

current) or MI (measure current). Table 6 describes the

full-scale current-range control.

Clamp Enable

The CLENABLE bit enables the force-output-voltage

clamps when high and disables the clamps when low.

There is hysteresis equal to approximately 5% of the

current range for clamp when serial bit B1 is 1. For bit

B1 = 0, no hysteresis, but clamp voltage is less accurate.

Measure Output High-Impedance Control

MSR_ attains a low-leakage, high-impedance state by

using the HI-ZMSR control bit, or the HI-Z_ input. HI-Z_ is

internally pulled up to V

with a 1.5MΩ resistor. The 2

bits are logically ANDed together to control the MSR_

output. HI-Z_ allows external multiplexing among several

PMU MSR_ outputs without using the serial interface.

Table 7 explains the various output modes for the MSR_

output.

Digital Output (DOUT)

The digital output follows the last output of the serial-

shift register and clocks out on the falling edge of

SCLK. DOUT serially shifts the first bit of the incoming

serial data word 16.5 clock cycles later. This allows for

daisy-chaining additional devices using DOUT and the

same clock.

MAX9951/MAX9952

Dual Per-Pin Parametric

Measurement Units

______________________________________________________________________________________ 17

Table 5. PMU Force-Measure Mode Selection

INMODE* FMODE MMODE HI-ZFORCE PMU MODE

FORCE

OUTPUT

MEASURE

OUTPUT

ACTIVE

INPUT

0 0 1 1 FVMI Voltage I

DUT

IN0

1 0 1 1 FVMI Voltage I

DUT

IN1

0 0 0 1 FVMV Voltage V

DUT

IN0

1 0 0 1 FVMV Voltage V

DUT

IN1

0 1 1 1 FIMI Current I

DUT

IN0

1 1 1 1 FIMI Current I

DUT

IN1

0 1 0 1 FIMV Current V

DUT

IN0

1 1 0 1 FIMV Current V

DUT

IN1

X 0 1 0

FNMI

(range E only)

High-

Impedance

DUT

X 0 0 0 FNMV

High-

Impedance

DUT

0 1 0 0 Termination Voltage V

DUT

IN0

1 1 0 0 Termination Voltage V

DUT

IN1

0 1 1 0 Termination Voltage I

DUT

IN0

1 1 1 0 Termination Voltage I

DUT

IN1

INSEL_ = 0

Table 6. Current-Range Selection

RS2 RS1 RS0 RANGE

NOMINAL

RESISTOR VALUE

(Ω)

0 0 X ±2µA R_E = 500k

0 1 0 ±20µA R_D = 50k

0 1 1 ±200µA R_C = 5k

1 0 0 ±2mA R_B = 500

1 X 1 ±64mA R_A = 15.6

1 1 0 External —

Table 7. MSR_ Output Truth Table

HI-ZMSR HI-Z_ MSR_

1 1 Measure output enabled

0 1 High impedance

1 0 High impedance

0 0 High impedance

MAX9951/MAX9952

“Quick Load” Using Chip Select

If CS goes low and then returns high without any clock

activity, the data from the input registers latch into the

PMU registers. This extra function is not standard for

SPI/QSPI/MICROWIRE interfaces. The quick load mim-

ics the function of LOAD without forcing LOAD low.

Comparators

Two comparators configured as a window comparator

monitor MSR_. THMAX_ and THMIN_ set the high and

low thresholds that determine the window. Both out-

puts are open drain and share a single disable control

that places the outputs in a high-impedance, low-leak-

age state. Table 8 describes the comparator output

states of the MAX9951/MAX9952.

Applications Information

In force-voltage (FV) mode, the voltage at FORCE_ is

directly proportional to the input control voltage. In

force-current (FI) mode, the current flowing out of

FORCE_ is proportional to the input control voltage.

Positive current flows out of the PMU.

In force-nothing (FN) mode, FORCE_ is high impedance.

In measure-current (MI) mode, the voltage at MSR_ is

directly proportional to the current exiting FORCE_.

Positive current flows out of the PMU.

In measure-voltage (MV) mode, the voltage at MSR_ is

directly proportional to the voltage at SENSE_.

Current-Sense-Amplifier

Offset-Voltage Input

IOS is a buffered input to the current-sense amplifiers.

The current-sense amplifiers convert the input control

voltage (IN0_ or IN1_) to the forced DUT current (FI),

and convert the sensed DUT current to the MSR_ out-

put voltage (MI). When IOS equals zero relative to

DUTGND (the GND voltage at the DUT, which the level-

setting DACs and the ADC are presumed to use as a

ground reference), the nominal voltage range that cor-

responds to ±full-scale current is -4V to +4V. Any volt-

age applied to IOS adds directly to this control

input/measure output voltage range, i.e., applying +4V

to IOS forces the voltage range that corresponds to

±full-scale current from 0 to +8V.

The following equations determine the minimum and

maximum currents for each current range correspond-

ing to the input voltage or measure voltage:

MAXCURRENT

= V

IOS

+ 4V

MINCURRENT

= V

IOS

- 4V

Choose IOS so the limits of MSR_ do not go closer than

2.8V to either V

or V

. For example, with supplies of

+10V and -5V, limit the MSR_ output to -2.2V and

+7.2V. Therefore, set IOS between +1.8V and +3.2V.

MSR_ could clip if IOS is not within this range. Use

these general equations for the limits on IOS:

Minimum V

IOS

= V

+ 6.8V

Maximum V

IOS

= V

- 6.8V

Current Booster for Highest Current Range

An external buffer amplifier can be used to provide a

current range greater than the MAX9951/MAX9952

maximum ±64mA output current (Figure 5). This func-

tion operates as follows:

Dual Per-Pin Parametric

Measurement Units

18 ______________________________________________________________________________________

Table 8. Comparator Truth Table

DI SABLE CONDITION DUTH_ DUTL_

0 X High-Z High-Z

1 V

MSR_

> V

THMAX_

and V

THMIN_

0 1

1 V

THMAX_

> V

MSR_

> V

THMIN_

1 1

1 V

THMAX_

and V

THMIN_

> V

MSR_

1 0

1 V

THMIN_

> V

MSR_

> V

THMAX_

* 0 0

THMAX_

> V

THMIN_

constitutes normal operation. This condi-

tion, however, has V

THMIN_

> V

THMAX_

and does not cause any

problems with the operation of the comparators.

MAX9951

MAX9952

MAIN AMP

CURRENT-

SENSE AMP

CCOM_ EXTSEL_

FORCE_

SENSE_

PMU

DUT

EXT

R_E

R_AS

R_A

R_X

50Ω

IN_

MSR_

Figure 5. External Current Boost

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24

MAX9951DCCB+D

Mfr. #:

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Maxim Integrated

Description:

Interface - Specialized Dual Per-Pin PMU

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MAX9951DCCB+D

MAX9951DCCB+D

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