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PDF NCT7511Y Data sheet ( Hoja de datos )
| Número de pieza | NCT7511Y | |
| Descripción | H/W Monitoring IC | |
| Fabricantes | nuvoton | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de NCT7511Y (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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NCT7511Y
Nuvoton
H/W Monitoring IC
Date: July/2012 Revision: 1.0
1 page  
NCT7511Y
1. GENERAL DESCRIPTION
The NCT7511Y is a Nuvoton Hardware Monitor IC, which can monitor several critical hardware
parameters of the systems, including the temperature and fan speeds, to make the system work stably
and efficiently.
The NCT7511Y supports one on-die and two remote temperature sensors with SMBus interface.
There’s a 10-bit analog-to-digital converter (ADC) is built inside NCT7511Y, to convert the monitored
temperature value. Both of the remote temperature inputs can be connected to CPU/GPU thermal
diode or any diode sensors and thermistor.
The NCT7511Y has 1 fan control groups and two GPIO pins. The SMART FANTM IV mode of the fan
speed control provides 4 sets of temperature setting points, and they can also control the duty cycle of
fan outputs. It provides an easy method to implement quiet and cooling solution with maximum safety
and flexibility.
Meanwhile, there’re two pure hardware event pins ALERT# and T_CRIT# for independent alarm
signals, and all threshold values could be set for system protection without timing delay.
2. FEATURES
2.1 Temperature Measurement
Measure the temperature with high accuracy.
One local on-die thermal sensor
Two pairs thermal diode (current mode) temperature channels
2.2 Fan Speed Monitoring and Control
SMART FANTM IV mode or Manual mode to control the fan speed
One fan control output multi-function (PWM/DC mode supported)
One fan tachometer input multi-function
2.3 Event Notification
Supports 2 alarm outputs: ALERT# and T_CRIT# signals to activate system protection.
ALERT# output supports SMBusTM 2.0 ARA function
T_CRIT# supports Hardware Power-on setting
2.4 General
Two GPIO pins
I2C® Compatible System Management bus (SMBus)
3.3V±5% VCC operation
16-pin QFN (Halogen free)
Confidential
July, 2012
- 1 - Version: 1.0
5 Page 
NCT7511Y
6.8 SMART FANTM IV
SMART FANTM IV supports Fan Duty Outputs Mode and Close Loop Fan Control (RPM) Mode to
control the fan speed.
There’re 3 slopes can be obtained by setting FanDuty/RPM1~FanDuty/RPM4 and T1~T4 through the
registers. When the temperature rises, FAN Output will calculate the target FanDuty/RPM based on
the current slope. For example, assuming Tx is the current temperature and FanDuty/RPM is the
target, then the slope:
X
2
FanDuty3
/
RPM 3
T 3
FanDuty2
T 2
/
RPM
2
Fan Output:
T arg et FanDuty or RPM FanDuty2 or RPM 2 Tx T 2 X 2
Fanduty/RPM
(unit RPM = 50 )
FullSpeed (FF, 100%)
Fanduty4/RPM4
Fanduty3/RPM3
Ty
Fanduty2/RPM2
Critical Hyst.
Operation Hyst.
X3
X2
Fanduty1/RPM1
X1
T1 T2 Tx T3 T4 TRCritical
Temperature
Figure 6-2 SMART FANTM IV Mechanism
In addition, SMART FANTM IV can also set up Critical Temperature and Hysteresis. If the current
temperature exceeds Critical Temperature, external fan will be forced by maximum FanDuty to meet
the largest target FanDuty or RPM, Which is 0xFF. The target FanDuty & RPM value will be
determined in accordance to the slope only when the temperature falls below (TCritical – Criticl Hyst.)
NCT7511Y provides 3 temperature source selections to map the fan, the algorithm will make a
decision to control the fan as below figure:
Confidential
July, 2012
- 7 - Version: 1.0
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet NCT7511Y.PDF ] | |
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