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參數(shù)資料

型號(hào)：	MAX6581TG98+
廠商：	MAXIM INTEGRATED PRODUCTS INC
元件分類：	模擬信號(hào)調(diào)理
英文描述：	SPECIALTY ANALOG CIRCUIT, QCC24
封裝：	4 X 4 MM, ROHS COMPLIANT, TQFN-24
文件頁(yè)數(shù)：	13/24頁(yè)
文件大?。?/td>	881K
代理商：	MAX6581TG98+

±1°C Accurate 8-Channel Temperature Sensor

MAX6581

20 _____________________________________________________________________________________

Series-Resistance Cancellation

Some thermal diodes on high-power ICs have exces-

sive series resistance that can cause temperature-mea-

surement errors when used with conventional remote-

temperature sensors. Channels 1–7 of the MAX6581

have a series-resistance cancellation feature (enabled

by bits [7:0] of the Resistance Cancellation register) that

eliminates the effect of diode series resistance and inter-

connection resistance. Set these bits to 1 if the series

resistance is large enough to affect the accuracy of the

channels. The series-resistance cancellation function

increases the conversion time for the remote channels by

125ms (typ). This feature cancels the bulk resistance of

the sensor and any other resistance in series (e.g., wire,

contact resistance, etc.). The cancellation range is from

0I to 100I.

Applications Information

Remote-Diode Selection

The MAX6581 directly measures the die temperature of CPUs

and other ICs that have on-chip temperature-sensing diodes

(see the Typical Application Circuit), or it can measure the

temperature of a discrete diode-connected transistor.

Discrete Remote Diodes

When the remote-sensing diode is a discrete transistor,

its collector and base must be connected together. Table

13 lists examples of discrete transistors that are appro-

priate for use with the MAX6581. The transistor must be

a small-signal type with a relatively high forward voltage;

otherwise, the A/D input-voltage range can be violated.

The forward voltage at the highest expected temperature

must be greater than 0.25V at 10FA, and at the lowest

expected temperature the forward voltage must be less

than 0.95V at 100FA. Large power transistors must not

be used. Also, ensure that the base resistance is less

than 100I. Tight specifications for forward-current gain

(e.g., 50 < A < 150) indicate that the manufacturer has

good process controls and that the devices have con-

sistent VBE characteristics. Manufacturers of discrete

transistors do not normally specify or guarantee ideality

factor. This normally is not a problem since good-quality

discrete transistors tend to have ideality factors that fall

within a relatively narrow range. Variations in remote

temperature readings of less than Q2NC with a variety of

discrete transistors have been observed. However, it is

good design practice to verify good consistency of tem-

perature readings with several discrete transistors from

any supplier under consideration.

Table 12. Resistance Cancellation Register (4Ah)

X = Don’t care.

BIT

NAME

POR

STATE

FUNCTION

7 (MSB)

—

RESISTANCE

CANCELLATION 7

Channel 7 Resistance Cancellation Enable Bit. Set this bit to logic 1 to enable