Rainbow-electronics MAX6683 Manual do Utilizador descarregar pdf (Página 7)

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

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

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

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

interface is inactive.

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).

MAX6683

Temperature Sensor and System Monitor

in a 10-Pin µMAX

_______________________________________________________________________________________ 7

Table 3. Voltage Data Format

ADC OUTPUT

CODE

INPUT VOLTAGE

AT 1.8V

INPUT VOLTAGE

AT 2.5V

INPUT VOLTAGE

AT 5V

= +3.3V

LSB weight 9.375mV (1.8V/192) 13mV (2.5V/192) 26mV (5V/192) 17.2mV (3.3V/192)

0 < 9.375mV < 13mV < 26mV —

1 9.375mV to 18.75mV 13mV to 26mV 26mV to 52mV —

2 18.75mV to 28.125mV 26mV to 39mV 52mV to 78mV —

—————

64 (1/4 scale) 600mV to 609.4mV 833mV to 846mV 1.664V to 1.692V —

—————

128 (1/2 scale) 1.2V to 1.2094V 1.667V to 1.680V 3.330V to 3.560V —

—————

192 (3/4 scale) 1.8V to 1.737V 2.5V to 2.513V 5V to 5.026V 3.3V to 3.317V

—————

253 2.372V to 2.381V 3.294V to 3.307V 6.566V to 6.640V 4.348V to 4.366V

254 2.381V to 2.391V 3.572V to 3.586V 6.615V to 6.640V 4.366V to 4.383V

255 = 2.391V = 3.586V = 6.640V = 4.383V

Table 2. Temperature Data Format

(Two's Complement)

HIGH BYTE

TEMPERATURE

(°C)

DIGITAL OUTPUT

(BINARY)

DIGITAL OUTPUT

(HEX)

+125 0111 1101 7D

+25 0001 1001 19

+1 0000 0001 01

0 0000 0000 00

-1 1111 1111 FF

-25 1110 0111 E7

-40 1101 1000 D8

LOW BYTE

0.875 1110 0000 D0

0.125 0010 0000 20

1 2 3 4 5 6 7 8 9 10 11 12 13 14

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