DESCRIPTION
The NE1618 is an accurate two-channel
temperature monitor. It measures the
temperature of itself and the temperature
of a remote sensor. It can replace the
NE1617 for a more precise measurement
to the remote temperature when it operates
in extended mode. The remote sensor is a
diode connected transistor being in the form of
either a discrete NPN/PNP, such as the
2N3904/2N3906, or a diode connected PNP
built into another die, such as is done on some
INTEL microprocessors.The temperature of both
the remote and local sensors are stored in
the registers that can be read via a 2-wire
SMBus. The data in the temp reading registers
are updated at the end of every data
conversion when the conversion is enable.
At all time, data conversion is initiated
automatically in the rate defined by the
programmable data in the conversion rate register.
However, a conversion can be forced to occur
immediately by a one-shot programming.
The local temp is always measured with a resolution
of 1.0℃ but the remote temp can be measured in either
one of two modes.extended mode with a resolution of
0.125℃ and basic mode with a resolution of 1.0℃
The mode is set up automatically according to
the programmable data stored in the conversion rate
register. (See Table 6). Extended mode is set when
the conversion rate is slow(rate 0.7 Hz or less)
and normal mode is set when the rate is high
(conversion rate of 2, 4, or 8 Hz).
There is also an alarm that senses either an over or under
temperature condition. The trip points for this alarm are also
programmable. The device can have 1 of 9 addresses (determined
by 2 address pins), so there can be up to 9 of the NE1618 on the
SMBus. It can also be put in a standby mode (in order to save
power). This can be done either with software (over the SMBus) or
with hardware (using the STBY pin).
FEATURES
Monitors local and remote temperature
Accuracy
–±2℃ local (on-chip) sensor
–±1.5℃ remote sensor with 1℃ resolution
–±1.0℃ remote sensor with 0.125℃ resolution
No calibration required
Programmable over/under temperature alarm
SMBus 2-wire serial interface
3 V to 3.6 V supply range
80µA supply current in operating mode
3µA(typical) supply current in standby mode
Small 16-lead QSOP package
APPLICATIONS
Desktop computers
Notebook computers
Smart battery packs
Industrial controllers
Telecom equipment
FUNCTIONAL BLOCK DIAGRAM
TYPICAL OPERATING CIRCUIT
NOTES:
1. May be required if remote diode is in a noisy environment and/or several feet from the NE1618.
2. May be required in noisy environment. Up to 2200 pF may be used.
FROM: Company Name: Aunytor Electronic (HK) Co.,Ltd
Contact Person: Charlotte
Skype: Aunytor
whatsapp：+86 13537622113
Email: carrot@aunytorchips.com