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
`80 A supply current in operating mode
`3 A (typical) supply current in standby mode
`Small 16-lead QSOP packageApplication·Desktop computers
·Notebook computers
·Smart battery packs
·Industrial controllers
·Telecom equipmentPinout
Specifications
| PARAMETER |
MIN. |
MAX. |
UNIT |
| VDD to GND |
-0.3 |
+6 |
V |
| D+, ADD0, ADD1 |
-0.3 |
VDD +0.3 |
V |
| D-C to GN |
-0.3 |
+0.8 |
V |
| SCLK, SDATA, ALERT, STBY |
-0.3 |
+6 |
V |
| Input current SDATA |
-1 |
+50 |
mA |
| D-C curren |
|
±1 |
mA |
ESD
Human Body Model
Machine Model |
-
- |
2000
200 |
V
V |
| Operating temperature range |
0 |
+120 |
|
| Maximum junction temperature |
|
+150 |
|
| Storage temperature range |
-65 |
+150 |
|
NOTE:
1.This is a stress rating only. Functional operation of the device as indicated in the operational section is not applied to this absolute maximum rating. Stress above those listed in !Absolute maximum ratings! may cause permanent damage to the device, and exposure to anyf these rating conditions for extended periods may affect device reliability.
DescriptionThe NE1618 is an accurate two-channel temperature monitor. It measures the temperature of itself and the temperature of a remote sensor. NE1618 can replace the NE1617 for a more precise measurement to the remote temperature when it operates in extended mode. The remote sensor of NE1618 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, NE1618 can be read via a 2-wire SMBus. The data of NE1618 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 of NE1618 is always measured with a resolution of 1.0 C 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 alsoprogrammable. 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. NE1618 can also be put in a standby mode (in order to save power). This can be done either with software (over the SMBus) or pin). with hardware (using the STBY pin)
NE1618 Data Sheet
