ADT7468ARQ-REEL datasheet(10/81 Pages) ONSEMI

Numer części	ADT7468ARQ-REEL

Szczegółowy opis	dBCool짰 Remote Thermal Controller and Voltage Monitor

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ADT7468

Rev. 3 | Page 10 of 81 | www.onsemi.com

PRODUCT DESCRIPTION

The ADT7468 is a complete thermal monitor and multiple fan

controller for any system requiring thermal monitoring and

cooling. The device communicates with the system via a serial

system management bus. The serial bus controller has a serial

data line for reading and writing addresses and data (Pin 1), and

an input line for the serial clock (Pin 2). All control and

programming functions for the ADT7468 are performed over

the serial bus. In addition, a pin can be reconfigured as an

SMBALERT output to signal out-of-limit conditions.

COMPARISON BETWEEN ADT7463 AND ADT7468

The ADT7468 is an upgrade to the ADT7463. The ADT7468

and ADT7463 are almost pin and register map compatible. The

ADT7468 and ADT7463 have the following differences:

1.

On the ADT7468, the PWM drive signals can be config-

ured as either high frequency or low frequency drives. The

low frequency option is programmable between 10 Hz and

100 Hz. The high frequency option is 22.5 kHz. On the

ADT7463, only the low frequency option is available.

2.

Once VCC is powered up, monitoring of temperature and

fan speeds is enabled on the ADT7468 when VCCP is

powered up. If VCCP is never powered up, this is enabled

when the first SMBus transaction with the ADT7468 is

completed. On the ADT7463, the STRT bit in Configur-

ation Register 1 must be set to enable monitoring.

3.

The fans are switched off by default upon power-up. On

the ADT7463, the fans run at full speed on power-up.

Fail-safe cooling is provided such that when the measured

temperature exceeds the THERM limit (100°C), the fans

run at full speed.

Fail-safe cooling is also provided 4.6 secs after VCCP is

powered-up (see Figure 48). The fans operate at full speed

if the ADT7468 has not been addressed via the SMBus

within 4.6 secs of when the VCCP is powered up. This

protects the system in the event that the SMBus fails. The

ADT7468 can be programmed at any time, and it behaves

as programmed. If VCCP is never powered-up, fail-safe

cooling is effectively disabled. If VCCP is disabled, writing to

the ADT7468 at any time causes the ADT7468 to operate

normally.

4.

Series resistance cancellation (SRC) is provided on the

remote temperature channels on the ADT7468, but not on

the ADT7463. SRC automatically cancels linear offset

introduced by a series resistance between the thermal

diode and the sensor.

5.

The ADT7468 has an extended temperature measurement

range. The measurement range goes from–64°C to +191°C.

On the ADT7463, the measurement range is from −127°C

to +127°C. This means that the ADT7468 can measure

higher temperatures. The ADT7468 also includes the

ADT7463 temperature range; the temperature measure-

ment range can be switched by setting Bit 0 of

Configuration Register 5.

6.

The ADT7468 maximum fan speed (% duty cycle) in the

automatic fan speed control loop can be programmed. The

maximum fan speed is 100% duty cycle on the ADT7463

and is not programmable.

7.

The offset register in the ADT7468 is programmable up to

±64°C with 0.50°C resolution. The offset register of the

ADT7463 is programmable up to ±32°C with 0.25°C

resolution.

8.

VCCP is monitored on Pin 23 of the ADT7468 and can be

used to set the threshold for THERM (PROCHOT) (2/3 of

VCCP). The threshold for THERM (PROCHOT) is set at

VIH = 1.7 V and VIL = 0.8 V on the ADT7463.

9.

On the ADT7463, Pin 22 can be reconfigured as SMBus

ALERT. This is not available on the ADT7468; instead,

SMBALERT can be enabled on Pin 14.

10. A GPIO can also be made available on Pin 14 on the

ADT7468. This is not available on the ADT7463. Set the

GPIO polarity and direction in Configuration Register 5.

The GPIO status bit is Bit 5 of Status Register 2 (shared

with TACH4 and THERM, because only one can be

enabled at a time).

11. The ADT7463 has three possible SMBus addresses, which

are selectable using the address select and address enable

pins. The ADT7468 has one SMBus address available at

Address 0x2E.

Due to the inclusion of extra functionality, the register map has

changed, including an additional configuration register:

Configuration Register 5 at Address 0x7C.

Configuration Register 5

Bit 0: If Bit 0 is set to 1, in terms of temperature the ADT7468 is

backward-compatible with the ADT7463. Measurements

including the TMIN calibration circuit, and fan control work in

the range of −127°C to +127°C. Also, care should be taken in

reprogramming the temperature limits (TMIN, operating point,

and THERM limits) to their desired twos complement value,

because the power-on default for them is at Offset 64. The

extended temperature range is −64°C to 191°C. The default is 1,

which is in the −64°C to +191°C temperature range.

Podobny numer części - ADT7468ARQ-REEL

Producent	Numer części	Arkusz danych	Szczegółowy opis
Analog Devices	ADT7468ARQ-REEL	1,021Kb / 80P	dBCool??Remote Thermal Controller and Voltage Monitor REV. 0
Analog Devices	ADT7468ARQ-REEL7	1,021Kb / 80P	dBCool??Remote Thermal Controller and Voltage Monitor REV. 0

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Podobny opis - ADT7468ARQ-REEL

Producent	Numer części	Arkusz danych	Szczegółowy opis
ON Semiconductor	ADT7466	691Kb / 48P	dBCool짰 Remote Thermal Controller and Voltage Monitor May 2010 ??Rev. 3
	ADT7476A	541Kb / 69P	Remote Thermal Controller and Voltage Monitor February, 2016 ??Rev. 7
	ADT7463	732Kb / 50P	Remote Thermal Controller and Voltage Monitor May, 2013 ??Rev. 7
	ADT7476	543Kb / 68P	Remote Thermal Controller and Voltage Monitor February, 2016 ??Rev. 10
Analog Devices	ADT7476	1Mb / 72P	dBCool Remote Thermal Controller and Voltage Monitor REV. A
Analog Devices	ADT7468	1,021Kb / 80P	dBCool??Remote Thermal Controller and Voltage Monitor REV. 0
ON Semiconductor	ADT7476A	613Kb / 67P	dBCOOL Remote Thermal Controller and Voltage Monitor May, 2010 ??Rev. 3
	ADM1027	1Mb / 56P	dBCOOL??Remote Thermal Controller and Voltage Monitor May 2010 - Rev. 3
	ADT7476	620Kb / 67P	dBCOOL Remote Thermal Controller and Voltage Monitor May, 2010 ??Rev. 6
Analog Devices	ADT7466	1Mb / 48P	dBCool Remote Thermal Controller and Voltage Monitor REV. 0

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