MAX1253AEUE View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX1253AEUE

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and VDD Monitor

Maxim Integrated 

Stand-Alone, 10-Channel, 12-Bit System Monitors

with Internal Temperature Sensor and VDD Monitor

VDD

T

8-TO-1

DIFFERENTIAL H

MUX

T

TEMP

CHOLDP

CHOLDN

TT

H

ADC

H

VAZ

DIFFERENTIAL INPUT EQUIVALENT INPUT CIRCUIT

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

VDD

T

CHOLD

8-TO-1

ADC

DIFFERENTIAL H

MUX

T

H

TEMP

VAZ

SINGLE-ENDED INPUT EQUIVALENT INPUT CIRCUIT

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

sets the differential input range from 0 to VREF. A nega-

tive differential analog input in unipolar mode causes

the digital output code to be zero. Selecting bipolar

mode sets the differential input range to ±VREF/2. The

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 MAX1253/MAX1254 always

operate in unipolar mode. The analog inputs are inter-

nally referenced to GND with a full-scale input range

from 0 to VREF.

Digital Interface

The MAX1253/MAX1254 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 MAX1253/MAX1254 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

MAX1253/MAX1254 support operation with SCLK idling

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

CPOL = CPHA = 1.

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

______________________________________________________________________________________ 13

Share Link: