Features: • Replacement for Maxim MAX1617 and Analog Devices ADM1021
• Monitors local and remote temperature
• Accuracy
± 2 local (on-chip) sensor
± 3 remote sensor
• No calibration required
• Programmable over/under temperature alarm
• SMBus 2-wire serial interface
• 3V to 5.5V supply range
• 70ma supply current in operating mode
• 3ma (typical) supply current in standby mode
• Small 16lead 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 to GND |
0.3 |
+0.8 |
V |
| SCLK, SDATA, ALERT, STBY |
0.3 |
+6 |
V |
| Input current SDATA |
1 |
+50 |
mA |
| D current |
|
±1 |
mA |
| Operating temperature range |
0 |
+120 |
|
| Maximum junction temperature |
|
+150 |
|
| Storage temperature range |
65 |
+150 |
|
DescriptionThe NE1617 is an accurate two-channel temperature monitor. It measures the temperature of itself and the temperature of a remote sensor. The remote sensor is a diode connected transistor. NE1617 can be 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 NE1617 is stored in a register that can be read via a 2-wire SMBus. The temperatures are updated at a rate that is programmable via the SMBus (the average supply current is dependent upon the update rate-the faster the rate, the higher the current).
In addition to the normal operation, which is to update the temperature at the programmed rate, there is a one shot mode that will force a temperature update.
There is also an alarm that senses either an over or under temperature condition. The trip points for this alarm are also programmable.
The NE1617 can have 1 of 9 addresses (determined by 2 address pins), so there can be up to 9 of the NE1617 on the SMBus.
NE1617 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 STANDBY pin).
NE1617 Data Sheet
