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PDF NCT7718W Data sheet ( Hoja de datos )
| Número de pieza | NCT7718W | |
| Descripción | Thermal Sensor IC | |
| Fabricantes | nuvoton | |
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NCT7718W
Nuvoton
Thermal Sensor IC
Date: Jan/11/2013 Revision: 1.1
1 page  
NCT7718W
1. GENERAL DESCRIPTION
NCT7718W is a temperature sensor with one local and one remote sensor; the remote temperature
sensor input could be connected to thermal diode or transistor, such as 2N3904. A 10-bit ADC
(Analog-to-Digital Converter) is built inside NCT7718W to convert the monitored temperature value
with 0.125C resolution.
Additionally, the NCT7718W supports 2-wire System Management Bus (SMBusTM) series interface,
and it also provides the hardware thermal alert or system shutdown via ALERT# and T_CRIT# pin.
The NCT7718W is a high precision, low-power consumption IC supporting SMBusTM interface, which
is specifically designed for the PC, Notebook applications, and any embedded environments. Its
available package is 8-pin MSOP, with the working voltage of 3.3V.
2. FEATURES
2.1 Temperature Measurement
Measure the temperature with high accuracy
One local on-die thermal sensor
One remote temperature sensor with current mode
2.2 Over Temperature
Supports 2 alert outputs : ALERT# and T_CRIT#
T_CRIT# point supports Hardware Power-on setting
ALERT# output supports SMBusTM 2.0 ARA function
2.3 General
I2C® Compatible System Management bus (SMBusTM)
3.3V±5% VDD operation
8-pin MSOP Green Package (Halogen-free)
Release Date: Feb., 2013
- 1 - Version: 1.1
5 Page 
NCT7718W
6.5.3 ALERT# Output SMBus alert Mode
Figure 3 shows the mechanism of the ALERT# output SMBusTM alert mode. In this mode, the ALERT#
output of the NCT7718W is connected to the SMBusTM alert line which has more than one device
connected to it. Through such and implementation, SMBusTM alert mode can assist the master in
resolving which salve generates an interrupt. When the measured temperature falls outside of the
allowed range, the ALERT# pin will be pulled low and the corresponding alert flags in Status Register
will be set to 1. The ALERT mask bit will just be set if there is a read command for Status Register or
when SMBusTM ALERT Response Address (ARA) occurs from master (Alert Response Address is
0001100x). Meanwhile, the NCT7718W will generate and return its own address to the master. If the
temperature never falls outside of the allowed range, the latched ALERT# pin can release by the reset
ALERT mask bit and the latched corresponding alert flags in Status Register can release by reading
command for Status Register.
Figure 3
6.5.4 T_CRIT# Output
T_CRIT# output pulls low when the measured temperature exceeds the critical temperature setting.
Once the T_CRIT# output pulls low, it will not be set high until the measured temperature is lower than
“T_CRIT – TH”, where TH is Temperature Hysteresis. Status Register will not be reset until it is read
and the temperature conversion falls below the T_CRIT set point, the ALERT-MSK bit of Configuration
Register will be set after Status Register read. Figure 4 shows this mechanism.
Figure 4
-7-
Release Date: Feb., 2013
Version: 1.1
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet NCT7718W.PDF ] | |
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