Rainbow-electronics MAX6652 Manual do Utilizador descarregar pdf (Página 6)

MAX6652

Writing a 1 to bit 0 of the configuration register starts

the monitoring function. The device will perform a

sequential sampling of all the inputs, starting with the

internal temperature sensor and continuing with 2.5V

12V

, 3.3V

, and V

. If the master terminates the

conversion, the sequential sampling will not stop until

the sampling cycle is completed and the results are

stored. When it starts again, it will always start with the

temperature measurement.

An interrupt signal is generated when a temperature

measurement goes above the hot limit or when a volt-

age measurement is either above the high limit or

below the low limit. This will cause the open-drain out-

put (ALERT) to go to the active-low state and set each

corresponding interrupt status bit (bits 0 through 4) to 1

(Table 5). The interrupt will be cleared by reading the

interrupt status register, except for temperature inter-

rupts generated in comparator mode. Reading the

interrupt status register also clears the register itself,

except for temperature interrupt bits set in comparator

mode.

Unless the fault is removed, the ALERT output will only

remain cleared until the end of the next conversion

cycle where it will again be asserted. The ALERT output

can also be masked by writing to the appropriate bits in

the interrupt mask register (Table 6) or by setting bit 1

of the configuration register (Table 4) to 0.

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 oscillation

frequency can be changed to provide the same protec-

tion against 50Hz by setting bit 7 in the configuration

sequences through the inputs, measuring voltages, and

temperature.

Temperature Sensor and System Monitor

in a 10-Pin µMAX

6 _______________________________________________________________________________________

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

Table 2. Temperature Data Format

ADC OUTPUT

CODE

INPUT VOLTAGE AT

12V

INPUT VOLTAGE AT

2.5V

INPUT VOLTAGE AT

3.3V

LSB weight 62mV (12V/192) 13mV (2.5V/192) 17.2mV (3.3V/192) 26mV (5.0V/192)

0 < 62mV < 13mV < 17.2mV —

1 62mV - 125mV 13mV - 26mV 17.2mV - 34.4mV —

2 125mV - 187mV 26mV - 39mV 34.4mV - 51.6mV —

———— —

64 (1/4 scale) 4.000V - 4.063V 833mV - 846mV 1.100V - 1.117V —

———— —

128 (1/2 scale) 8.000V - 8.063V 1.667V - 1.680V 2.200V - 2.217V 3.330V - 3.560V

———— —

192 (3/4 scale) 12.000V - 12.063V 2.500V - 2.513V 3.300V - 3.317V 5.000V - 5.026V

———— —

253 15.813V - 15.875V 3.294V - 3.307V 4.348V - 4.366V 6.566V - 6.615V

254 15.875V - 15.938V 3.572V - 3.586V 4.366V - 4.383V 6.615V - 6.640V

255 > 15.938 > 3.586 > 4.383 > 6.640

Table 3. Voltage Data Format

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

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