Rainbow-electronics MAX1299 Manual do Utilizador descarregar pdf (Página 11)

MAX1298/MAX1299

12-Bit Serial-Output Temperature Sensors

with 5-Channel ADC

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Detailed Description

The MAX1298/MAX1299 are low-power, serial-output,

multichannel ADCs with temperature-sensing capability

for thermostatic, process-control, and monitoring appli-

cations. An algorithmic switched-capacitor converter

with T/H circuitry for both positive and negative inputs

supports fully differential 12-bit conversions from an

internal temperature sensor, two external temperature

sensors, or voltage sources in a variety of channel con-

figurations. Microprocessor (µP) control is made easy

through a flexible 3-wire serial interface.

Figure 1 shows a simplified functional diagram of the

internal architecture for the MAX1298/MAX1299. In tem-

perature-sensing mode, the multiplexer (mux) steers

bias currents through internal or external diodes while

the ADC computes their temperature in relation to

changes in forward voltage. Channels not used for tem-

perature measurement can be configured to measure

other system voltages.

INPUT

DIODE

BIAS

CONTROL

LOGIC

INPUT

MUX

OUTPUT

CLOCK

12-BIT

ADC

SHIELD

OUTPUT

T/H

GND

DOUT

SCLK

DIN

AIN0

AIN1

AIN2

AIN3

AIN4

AIN5

SHO REF

REF

MAX1298

MAX1299

Figure 1. Functional Diagram

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 19 20

MAX1298/MAX1299 1

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