ADT7467_12 datasheet(8/72 Pages) ONSEMI

部件名	ADT7467

功能描述	Remote Thermal Monitor and Fan Controller

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制造商	ONSEMI [ON Semiconductor]

网页	http://www.onsemi.com

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ADT7467

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Product Description

The ADT7467 is a complete thermal monitor and multiple

fan controller for systems 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 16) and an input line for the serial clock (Pin 1). All

control and programming functions for the ADT7467 are

performed over the serial bus. In addition, one of two pins

can be reconfigured as an SMBALERT output to signal

out-of-limit conditions.

Comparison between ADT7460 and ADT7467

The ADT7467 is an upgrade from the ADT7460. The

ADT7467 and ADT7460 are almost pin and register map

compatible. The ADT7467 and ADT7460 have the

following differences:

1. On the ADT7467, the PWM drive signals can be

configured 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

ADT7460, only the low frequency option is

available.

2. Once VCC and VCCP are powered up, monitoring

of temperature and fan speeds is enabled on the

ADT7467. If VCCP is never powered up,

monitoring is enabled when the first SMBus

transaction with the ADT7467 is complete. On the

ADT7460, the STRT bit in Configuration Register

1 must be set to enable monitoring.

3. The fans are switched off by default upon

power-up of the ADT7467. On the ADT7460, the

fans run at full speed upon power-up.

Fail-safe cooling is provided on the ADT7467. If

the measured temperature exceeds the THERM

limit (100C), the fans run at full speed.

Fail-safe cooling is also provided 4.6 sec after

VCCP is powered up. The fans operate at full speed

if the ADT7467 has not been addressed via the

SMBus within 4.6 sec of when the VCCP is

powered up. This protects the system in the event

that the SMBus fails. The ADT7467 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 ADT7467 at any time

causes the ADT7467 to operate normally.

4. Series resistance cancellation (SRC) is provided

on the remote temperature channels on the

ADT7467, but not on the ADT7460. SRC

automatically cancels linear offset introduced by a

series resistance between the thermal diode and the

sensor.

5. The ADT7467 has an extended temperature

measurement range. The measurement range goes

from −64C to +191C. On the ADT7460, the

measurement range is from −127C to +127C.

This means that the ADT7467 can measure higher

temperatures. The ADT7467 also includes the

ADT7460 temperature range; the temperature

measurement range can be switched by setting

Bit 0 of Configuration Register 5.

6. The ADT7467 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 ADT7460 and is not

programmable.

7. The offset register in the ADT7467 is

programmable up to 64C with 0.50C

resolution. The offset register of the ADT7460 is

programmable up to 32C with 0.25C

resolution.

8. VCCP is monitored on Pin 14 of the ADT7467 and

can be used to set the threshold for THERM

(PROCHOT) (2/3 of VCCP). 2.5 V is monitored on

Pin 14 of the ADT7460. The threshold for

THERM (PROCHOT) is set at VIH = 1.7 V and

VIL = 0.8 V on the ADT7460.

9. On the ADT7460, Pin 14 could be reconfigured as

SMBALERT. This is not available on the ADT7467.

SMBALERT can be enabled instead on Pin 9.

10. A GPIO can also be made available on Pin 9 on the

ADT7467. This is not available on the ADT7460.

Set the GPIO polarity and direction in Configuration

Register 5. The GPIO status bit is Bit 5 of Status

Register 2 (it is shared with TACH4 and THERM

because only one can be enabled at a time).

11. The ADT7460 has three possible SMBus

addresses, which are selectable using the address

select and address enable pins. The ADT7467 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, the ADT7467, in terms of

temperature, is backward compatible with the ADT7460.

Measurements, including TMIN calibration circuit and fan

control, work in the range −127C to +127C. In addition,

care should be taken in reprogramming the temperature

limits (TMIN, operating point, THERM) 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.

Bit 1 = 0 is the high frequency (22.5 kHz) fan drive signal.

Bit 1 = 1 switches the fan drive to low frequency PWM,

programmable between 10 Hz and 100 Hz, the same as the

ADT7460. The default is 0, or HF PWM.

类似零件编号 - ADT7467_12

制造商	部件名	数据表	功能描述
Analog Devices	ADT7467ARQ	1Mb / 80P	dBCool Remote Thermal Monitor and Fan Controller REV. 0
ON Semiconductor	ADT7467ARQ	938Kb / 77P	dBCool Remote Thermal Monitor and Fan Controller January 2008 ??Rev. 3
Analog Devices	ADT7467ARQ-REEL	1Mb / 80P	dBCool Remote Thermal Monitor and Fan Controller REV. 0
ON Semiconductor	ADT7467ARQ-REEL	938Kb / 77P	dBCool Remote Thermal Monitor and Fan Controller January 2008 ??Rev. 3
Analog Devices	ADT7467ARQ-REEL7	1Mb / 80P	dBCool Remote Thermal Monitor and Fan Controller REV. 0

More results

类似说明 - ADT7467_12

制造商	部件名	数据表	功能描述
ON Semiconductor	ADT7490	763Kb / 75P	Remote Thermal Monitor and Fan Controller January, 2016 ??Rev. 6
	ADT7475	539Kb / 58P	Remote Thermal Monitor and Fan Controller August, 2018 ??Rev. 8
	ADT7460ARQ-REEL	698Kb / 47P	Remote Thermal Monitor and Fan Controller September, 2013 ??Rev. 9
	NCT7491	794Kb / 81P	Remote Thermal Monitor and Fan Controller November, 2015 ??Rev. 2
	NCT7491	791Kb / 80P	Remote Thermal Monitor and Fan Controller June, 2016 ??Rev. 3
	ADT7475	539Kb / 58P	Remote Thermal Monitor and Fan Controller August, 2018 ??Rev. 8
	ADT7475_1110	639Kb / 58P	dbCOOL Remote Thermal Monitor and Fan Controller October, 2011 ??Rev. 5
Analog Devices	ADT7473	1Mb / 76P	dBCool Remote Thermal Monitor and Fan Controller REV. A
ON Semiconductor	ADT7460	645Kb / 46P	dBCOOL Remote Thermal Monitor and Fan Controller June, 2010 ??Rev. 5
ON Semiconductor	ADT7475	654Kb / 58P	dBCOOL Remote Thermal Monitor and Fan Controller June, 2009 ??Rev. 4

More results

ADT7467 数据表(PDF) 8 Page - ON Semiconductor

ADT7467 数据表(HTML) 8 Page - ON Semiconductor

类似零件编号 - ADT7467_12

类似说明 - ADT7467_12

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ADT7467 数据表(PDF) 8 Page - ON Semiconductor

ADT7467 数据表(HTML) 8 Page - ON Semiconductor

类似零件编号 - ADT7467_12

类似说明 - ADT7467_12

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