Stand-Alone, 10-Channel, 10-Bit System Monitors

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13

In differential mode, the T/H samples the difference

between two analog inputs, eliminating common-mode

DC offsets and noise. See the

Input Configuration

Register section and Tables 5 and 6 for more details on

configuring the analog inputs.

Unipolar/Bipolar

When performing differential conversions, the input

configuration register (Tables 5 and 6) also selects

between unipolar and bipolar operation. Unipolar mode

tive differential analog input in unipolar mode causes

the digital output code to be zero. Selecting bipolar

mode sets the differential input range to

digital output code is straight binary in unipolar mode

and two’s complement in bipolar mode (see the

Transfer Function section).

In single-ended mode, the MAX1153/MAX1154 always

operate in unipolar mode. The analog inputs are inter-

nally referenced to GND with a full-scale input range

Digital Interface

The MAX1153/MAX1154 digital interface consists of

five signals: CS, SCLK, DIN, DOUT, and INT. CS,

SCLK, DIN, and DOUT comprise an SPI™-compatible

serial interface (see the

Serial Digital Interface section).

INT is an independent output that provides an indica-

tion that an alarm has occurred in the system (see the

INT Interrupt Output section).

Serial Digital Interface

The MAX1153/MAX1154 feature a serial interface com-

patible with SPI, QSPI™, and MICROWIRE™ devices.

For SPI/QSPI, ensure that the CPU serial interface runs

in master mode so it generates the serial clock signal.

Select a serial clock frequency of 10MHz or less, and

set clock polarity (CPOL) and phase (CPHA) in the µP

control registers to the same value, one or zero. The

MAX1153/MAX1154 support operation with SCLK idling

high or low, and thus operate with CPOL = CPHA = 0 or

CPOL = CPHA = 1.

T

T

TT

H

HH

ADC

8-TO-1

DIFFERENTIAL

MUX

TEMP

DIFFERENTIAL INPUT EQUIVALENT INPUT CIRCUIT

T

CHOLD

CHOLDP

CHOLDN

T

H

H

ADC

8-TO-1

DIFFERENTIAL

MUX

TEMP

SINGLE-ENDED INPUT EQUIVALENT INPUT CIRCUIT

Figure 5. Single-Ended/Differential Input Equivalent Input Circuit

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.