MAX6683EVKIT【PDF 7/14 页】EVAL KIT FOR MAX6683

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Temperature Sensor and

System Monitor in a 10-Pin μMAX

Table 2. Temperature Data Format

(Two's Complement)

HIGH BYTE

voltage. This is equivalent to 4 and 2 cycles of 60Hz,

respectively, and provides protection against noise

pickup from the main supply. The internal oscillator fre-

quency can be changed to provide the same protection

against 50Hz by setting bit 7 in the Configuration

TEMPERATURE

(°C)

+125

+25

+1

0

-1

-25

-40

LOW BYTE

0.875

0.125

DIGITAL OUTPUT

(BINARY)

0111 1101

0001 1001

0000 0001

0000 0000

1111 1111

1110 0111

1101 1000

1110 0000

0010 0000

DIGITAL OUTPUT

(HEX)

7D

19

01

00

FF

E7

D8

D0

20

Register to 1 (Table 4). The multiplexer automatically

sequences through the inputs, measuring voltages and

temperature.

Low-Power Shutdown Mode

Setting bit 0 in the Configuration Register to zero stops

the monitoring loop and puts the MAX6683 into low-

power shutdown mode. In this mode, the SMBus/I 2 C

interface remains active, and the supply current drops

to 10μA or less.

Power-On Reset

The MAX6683 POR supply voltage is typically 2V.

Below this supply voltage, all registers are reset, the

device is put into shutdown mode, and the SMBus/I 2 C

interface is inactive.

ten to the Serial Address Register. This code overwrites

the code set by connection of the ADD pin, until the

MAX6683 is taken through a POR cycle.

ADC and Multiplexer

The ADC integrates over a 66ms period, an integral

multiple of the line period with excellent noise rejection.

The internal oscillator is trimmed to produce a 66ms

conversion time for temperature and 33ms for each

Table 3. Voltage Data Format

Alarm Threshold Registers

Two registers, a hot temperature limit (T HOT ) at 39h and

a hot temperature hysteresis (T HYST ) at 3Ah, store

alarm threshold data (Table 1). If a measured tempera-

ture exceeds the value of T HOT , an ALERT is asserted.

Alerts are cleared and reasserted depending on

the interrupt mode selected in the Temperature

Configuration Register (see ALERT Interrupts).

ADC OUTPUT

CODE

LSB weight

0

1

2

—

64 (1/4 scale)

—

128 (1/2 scale)

—

192 (3/4 scale)

—

253

254

255

INPUT VOLTAGE

AT 1.8V IN

9.375mV (1.8V/192)

< 9.375mV

9.375mV to 18.75mV

18.75mV to 28.125mV

—

600mV to 609.4mV

—

1.2V to 1.2094V

—

1.8V to 1.737V

—

2.372V to 2.381V

2.381V to 2.391V

= 2.391V

INPUT VOLTAGE

AT 2.5V IN

13mV (2.5V/192)

< 13mV

13mV to 26mV

26mV to 39mV

—

833mV to 846mV

—

1.667V to 1.680V

—

2.5V to 2.513V

—

3.294V to 3.307V

3.572V to 3.586V

= 3.586V

INPUT VOLTAGE

AT 5V IN

26mV (5V/192)

< 26mV

26mV to 52mV

52mV to 78mV

—

1.664V to 1.692V

—

3.330V to 3.560V

—

5V to 5.026V

—

6.566V to 6.640V

6.615V to 6.640V

= 6.640V

V CC = +3.3V

17.2mV (3.3V/192)

—

—

—

—

—

—

—

—

3.3V to 3.317V

—

4.348V to 4.366V

4.366V to 4.383V

= 4.383V

_______________________________________________________________________________________

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