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LM75AD Datasheet(PDF) 7 Page - NXP Semiconductors

Part # LM75AD
Description  Digital temperature sensor and thermal Watchdog
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

LM75AD Datasheet(HTML) 7 Page - NXP Semiconductors

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Philips Semiconductors
Product data sheet
LM75A
Digital temperature sensor and thermal Watchdog
2004 Oct 05
7
FUNCTIONAL DESCRIPTION
General operation
The LM75A uses the on-chip band-gap sensor to measure the
device temperature with the resolution of 0.125
°C and stores the
11-bit 2’s complement digital data, resulted from 11-bit A-to-D
conversion, into the device Temp register. This Temp register can be
read at any time by a controller on the I2C-bus. Reading
temperature data does not affect the conversion in progress during
the read operation.
The device can be set to operate in either mode: normal or
shut-down. In normal operation mode, the temp-to-digital conversion
is executed every 100 ms and the Temp register is updated at the
end of each conversion. In shut-down mode, the device becomes
idle, data conversion is disabled and the Temp register holds the
latest result; however, the device I2C interface is still active and
register write/ read operation can be performed. The device
operation mode is controllable by programming bit B0 of the
configuration register. The temperature conversion is initiated when
the device is powered-up or put back into normal mode from
shut-down.
In addition, at the end of each conversion in normal mode, the
temperature data (or Temp) in the Temp register is automatically
compared with the over-temp shut-down threshold data (or Tos)
stored in the Tos register, and the hysteresis data (or Thyst) stored
in the Thyst register, in order to set the state of the device OS output
accordingly. The device Tos and Thyst registers are write/read
capable, and both operate with 9-bit 2’s complement digital data.
To match with this 9-bit operation, the temp register uses only the
9 MSB bits of its 11-bit data for the comparison.
The way that the OS output responds to the comparison operation
depends upon the OS operation mode selected by configuration
bit B1, and the user-defined fault queue defined by configuration
bits B3 and B4.
In OS comparator mode, the OS output behaves like a thermostat. It
becomes active when the Temp exceeds the Tos, and is reset when
the Temp drops below the Thyst. Reading the device registers or
putting the device into shut-down 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 Tos; then it remains active indefinitely
until being reset by a read of any register. Once the OS output has
been activated by crossing Tos and then reset, it can be activated
again only when the Temp drops below the Thyst; 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:
Tos trip, Reset, Thyst trip, Reset, Tos trip, Reset, Thyst trip, Reset,
Putting the device into shut-down mode 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 register.
Also, the OS output active state is selectable as HIGH or LOW by
setting accordingly the configuration register bit B2.
At power-up, the device is put into normal operation mode, the Tos
is set to 80
°C, the Thyst is set to 75 °C, 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 5.
SL01392
Temp
**
*
POWER-UP
TIME
OS RESET
OS ACTIVE
OS OUTPUT IN INTERRUPT MODE
OS OUTPUT IN COMPARATOR MODE
OS RESET
OS ACTIVE
Tos
Thyst
READING TEMPERATURE & LIMITS
* = OS is reset by either reading register or putting the device in shutdown.
Assumed that the fault queue is met at each Tos and Thyst crossing point.
Figure 5. OS response to temperature.


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