參數(shù)資料
型號(hào)： ADT7466ARQZ-REEL
廠商： ANALOG DEVICES INC
元件分類： 模擬信號(hào)調(diào)理
英文描述： dBCool Remote Thermal Controller and Voltage Monitor
中文描述： SPECIALTY ANALOG CIRCUIT, PDSO16
封裝： LEAD FREE, MO-137AB, QSOP-16
文件頁(yè)數(shù)： 11/48頁(yè)
文件大小： 1269K
代理商： ADT7466ARQZ-REEL
ADT7466
FUNCTIONAL DESCRIPTION
The ADT7466 is a complete thermal monitor and dual fan
controller for any system requiring monitoring and cooling.
The device communicates with the system via a serial system
management bus (SMBus). The serial data line (SDA, Pin 15) is
used for reading and writing addresses and data. The input line,
(SCL, Pin 16) is the serial clock. All control and programming
functions of the ADT7466 are performed over the serial bus. In
addition, an ALERT output is provided to indicate out-of-limit
conditions.
Rev. 0 | Page 11 of 48
MEASUREMENT INPUTS
The device has three measurement inputs, two for voltage and
one for temperature. It can also measure its own supply voltage
and can measure ambient temperature with its on-chip
temperature sensor.
Pin 11 and Pin 12 are analog inputs with an input range of 0 V
to 2.25 V. They can easily be scaled for other input ranges by
using external attenuators. These pins can also be configured
for temperature monitoring by using thermistors or a second
remote diode temperature measurement.
The ADT7466 can simultaneously monitor the local
temperature, the remote temperature by using a discrete
transistor, and two thermistor temperatures.
Remote temperature sensing is provided by the D+ and D
inputs, to which diode connected, remote temperature sensing
transistors such as a 2N3904 or CPU thermal diode can be
connected.
Temperature sensing using thermistors is carried out by placing
the thermistor in series with a resistor. The excitation voltage is
provided by the REFOUT pin.
The device also accepts input from an on-chip band gap
temperature sensor that monitors system ambient temperature.
Power is supplied to the chip via Pin 6. The system also
monitors V
CC
through this pin. It is normally connected to a
3.3 V supply. It can, however, be connected to a 5 V supply and
monitored without going over range.
SEQUENTIAL MEASUREMENT
When the ADT7466 monitoring sequence is started, it
sequentially cycles through the measurement of analog inputs
and the temperature sensors. Measured values from these
inputs are stored in value registers, which can be read out over
the serial bus, or can be compared with programmed limits
stored in the limit registers. The results of out of limit
comparisons are stored in the status registers, which can be read
over the serial bus to flag out-of-limit conditions.
FAN SPEED MEASUREMENT AND CONTROL
The ADT7466 has two tachometer inputs for measuring the
speed of 3-wire fans, and it has two 8-bit DACs to control the
speed of two fans. The temperature measurement and fan speed
control can be linked in an automatic control loop, which can
operate without CPU intervention to maintain system operating
temperature within acceptable limits. The enhanced acoustics
feature ensures that fans operate at the minimum possible speed
consistent with temperature control, and change speed
gradually. This reduces the user’s perception of changing fan
speed.
INTERNAL REGISTERS OF THE ADT7466
Table 4 provides brief descriptions of the ADT7466’s principal
internal registers. More detailed information on the function of
each register is given in Table 30 to Table 72.
Table 4. Internal Register Summary
Register
Configuration
Address Pointer
Description
These registers provide control and configuration of the ADT7466 including alternate pinout functionality.
This register contains the address that selects one of the other internal registers. When writing to the ADT7466, the
first byte of data is always a register address, which is written to the address pointer register.
These registers provide status of each limit comparison and are used to signal out-of-limit conditions on the
temperature, voltage, or fan speed channels. Whenever a status bit is set, the ALERT output (Pin 14) goes low.
These registers allow interrupt sources to be masked so that they do not affect the ALERT output.
The results of analog voltage inputs, temperature, and fan speed measurements are stored in these registers, along
with their limit values.
These registers allow each temperature channel reading to be offset by a twos complement value written to these
registers.
This register allows the ADT7466 to monitor and time any PROCHOT events gauging system performance.
These registers program the starting temperature for each fan under automatic fan speed control.
These registers program the temperature-to-fan speed control slope in automatic fan speed control mode for each
fan drive output.
This register sets the step size for fan drive changes in AFC mode to minimize acoustic noise.
Status
Interrupt Mask
Value and Limit
Offset
PROCHOT Status
T
MIN
T
RANGE
Enhance Acoustics
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