LM75BD,112【PDF 6/37 页】IC TEMP SENSOR DIGITAL 8-SOIC

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Sheet目录41

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LM75B

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Product data sheet

Rev. 5 22 January 2014

6 of 37

NXP Semiconductors

LM75B

Digital temperature sensor and thermal watchdog

In OS comparator mode, the OS output behaves like a thermostat. It becomes active

when the Temp exceeds the T

th(ots)

, and is reset when the Temp drops below the T

hys

Reading the device registers or putting the device into shutdown does not change the

state of the OS output. The OS output in this case can be used to control cooling fans or

thermal switches.

In OS interrupt mode, the OS output is used for thermal interruption. When the device is

powered-up, the OS output is first activated only when the Temp exceeds the T

th(ots)

; then

it remains active indefinitely until being reset by a read of any register. Once the OS output

has been activated by crossing T

th(ots)

and then reset, it can be activated again only when

the Temp drops below the T

hys

; then again, it remains active indefinitely until being reset

by a read of any register. The OS interrupt operation would be continued in this sequence:

th(ots)

trip, Reset, T

hys

trip, Reset, T

th(ots)

trip, Reset, T

hys

trip, Reset, etc. Putting the

device into the shutdown mode by setting the bit 0 of the configuration register also resets

the OS output.

In both cases, comparator mode and interrupt mode, the OS output is activated only if a

number of consecutive faults, defined by the device fault queue, has been met. The fault

queue is programmable and stored in the two bits, B3 and B4, of the Configuration

accordingly the configuration register bit B2.

At power-up, the device is put into normal operation mode, the T

th(ots)

is set to 80 癈, the

hys

is set to 75 癈, the OS active state is selected LOW and the fault queue is equal to 1.

The temp reading data is not available until the first conversion is completed in about

100 ms.

The OS response to the temperature is illustrated in Figure 6

(1) OS is reset by either reading register or putting the device in shutdown mode. It is assumed that

the fault queue is met at each T

th(ots)

and T

hys

crossing point.

Fig 6. OS response to temperature

(1)

th(ots)

hys

OS reset

S active

OS reset

S active

OS output in comparator mode

OS output in interrupt mode

reading temperature limits

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