ADT7482 데이터 시트보기 (PDF) - Analog Devices
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ADT7482 Datasheet PDF : 24 Pages
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ADT7482
REGISTERS
The registers in the ADT7482 are 8-bits wide. These registers
are used to store the results of remote and local temperature
measurements and high and low temperature limits and to
configure and control the device. A description of these registers
follows.
ADDRESS POINTER REGISTER
The address pointer register itself does not have, or require, an
address, as the first byte of every write operation is automatically
written to this register. The data in this first byte always contains
the address of another register on the ADT7482, which is stored
in the address pointer register. It is to this register address that
the second byte of a write operation is written to or to which a
subsequent read operation is performed.
The power-on default value of the address pointer register is
0x00. Therefore, if a read operation is performed immediately
after power-on, without first writing to the address pointer, the
value of the local temperature is returned, since its register
address is 0x00.
CONFIGURATION REGISTERS
There are two configuration registers used to control the
operation of the ADT7482. Configuration 1 register is at
Address 0x03 for reads and Address 0x09 for writes. See Table 9
for details regarding the operation of this register. Configuration 2
Register is at Address 0x24 for both reads and writes. Setting Bit
7 of this register locks all lockable registers. The affected
registers can only be modified if the ADT7482 is powered down
and powered up again. See Table 16 for a list of the registers
affected by the lock bit.
TEMPERATURE VALUE REGISTERS
The ADT7482 has five registers to store the results of local and
remote temperature measurements. These registers can only be
written to by the ADC and can be read over the SMBus.
• The local temperature value register is at Address 0x00.
• The Remote 1 temperature value high byte register is at
Address 0x01; the Remote 1 low byte register is at
Address 0x10.
• The Remote 2 temperature value high byte register is at
Address 0x30; the Remote 2 low byte register is at
Address 0x33.
• The Remote 2 temperature values can be read from
Addresses 0x01 for the high byte and Address 0x10 for the
low byte if Bit 3 of Configuration Register 1 is set to 1.
• To read the Remote 1 temperature values, set Bit 3 of
Configuration Register 1 to 0.
• The power-on default for all five registers is 0x00.
Table 9. Configuration 1 Register (Read Address = 0x03, Write Address = 0x09)
Bit Mnemonic Description
7
Mask
Setting this bit to 1 masks all ALERTs on the ALERT pin. Default = 0 = ALERT enabled. This applies only if Pin 8 is
configured as ALERT, otherwise it has no effect.
6
Mon/STBY Setting this bit to 1 places the ADT7482 in standby mode (that is, it suspends all temperature measurements (ADC). The
SMBus remains active and values can be written to and read from the registers. THERM and ALERT are also active in
standby mode. Changes made to the limit registers in standby mode that effect the THERM or ALERT outputs cause
these signals to be updated. Default = 0 = temperature monitoring enabled.
5
AL/TH
This bit selects the function of Pin 8. Default = 0 = ALERT. Setting this bit to 1 configures Pin 8 as THERM2 pin.
4
Reserved Reserved for future use.
3
Remote 1 Setting this bit to 1 enables Remote 2 values to be read from the Remote 1 registers. Default = 0 = Remote 1
/Remote 2 temperature values and limits are read from these registers.
2
Temp
Range
Setting this bit to 1 enables the extended temperature measurement range (−50°C to +150°C).
Default = 0 = (0°C to +127°C).
1
Mask R1
Setting this bit to 1 masks ALERTs due to the Remote 1 temperature exceeding a programmed limit. Default = 0.
0
Mask R2
Setting this bit to 1 masks ALERTs due to the Remote 2 temperature exceeding a programmed limit. Default = 0.
Table 10. Configuration 2 Register (Read/Write Address = 0x24)
Bit Mnemonic Description
7
Lock Bit
Setting this bit to 1 locks all lockable registers to their current values. This prevents settings from being tampered with
until the device is powered down. Default = 0.
<6:0> Res
Reserved for future use.
Rev. 0 | Page 12 of 24
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