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| 型号： | ADT7482ARMZ-RL7 |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/20页 |
| 文件大小： | 282K |
| 描述： | IC TEMP SENSOR 2CH ALARM 10MSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 1,000 |
| 功能： | 温度监控系统（传感器） |
| 传感器类型： | 内部和外部 |
| 感应温度： | -40°C ~ 125°C，外部传感器 |
| 精确度： | ±2.5°C（最小值） |
| 拓扑： | ADC，比较器，多路复用器，寄存器库 |
| 输出类型： | SMBus? |
| 输出警报： | 是 |
| 输出风扇： | 是 |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 带卷 (TR) |
ADT7482
http://onsemi.com
9
The ADT7482 has two temperature data formats. When
the temperature measurement range is from 0癈 to 127癈
(default), the temperature data format for both local and
remote temperature results is binary.
Table 8. TEMPERATURE DATA FORMAT
(LOCAL AND REMOTE TEMPERATURE HIGH BYTE)
Temperature
Binary
Offset Binary
(Note 1)
55癈
0 000 0000
(Note 2)
0 000 1001
0癈
0 000 0000
0 100 0000
+1癈
0 000 0001
0 100 0001
+10癈
0 000 1010
0 100 1010
+25癈
0 001 1001
0 101 1001
+50癈
0 011 0010
0 111 0010
+75癈
0 100 1011
1 000 1011
+100癈
0 110 0100
1 010 0100
+125癈
0 111 1101
1 011 1101
+127癈
0 111 1111
1 011 1111
+150癈
0 111 1111
(Note 3)
1 101 0110
1. Offset binary scale temperature values are offset by +64.
2. Binary scale temperature measurement returns 0 for all
temperatures < 0癈.
3. Binary scale temperature measurement returns 127 for all
temperatures > 127癈.
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.
?SPAN class="pst ADT7482ARMZ-REEL_2296055_3"> The local temperature value register is at Address 0x00.
?SPAN class="pst ADT7482ARMZ-REEL_2296055_3"> The Remote 1 temperature value high byte register is at
Address 0x01; the Remote 1 low byte register is at
Address 0x10.
?SPAN class="pst ADT7482ARMZ-REEL_2296055_3"> The Remote 2 temperature value high byte register is at
Address 0x30; the Remote 2 low byte register is at
Address 0x33.
?SPAN class="pst ADT7482ARMZ-REEL_2296055_3"> 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.
?SPAN class="pst ADT7482ARMZ-REEL_2296055_3"> To read the Remote 1 temperature values, set Bit 3 of
Configuration Register 1 to 0.
?SPAN class="pst ADT7482ARMZ-REEL_2296055_3"> The power-on default for all five registers is 0x00.
Table 9. CONFIGURATION 1 REGISTER (READ ADDRESS 0x03, WRITE ADDRESS 0x09)
Bit
Mnemonic
Function
7
Mask
Setting this bit to 1 masks all ALERT
s 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 the THERM2
pin.
4
Reserved
Reserved for future use.
3
Remote 1
/Remote2
Setting this bit to 1 enables the user to read the Remote 2 values from the Remote 1 registers. When default = 0,
Remote 1 temperature values and limits are read from these registers.
2
Temp
Range
Setting this bit to 1 enables the extended temperature measurement range of 50癈 to +150癈.
Default = 0 = 0癈 to +127癈.
1
Mask R1
Setting this bit to 1 masks ALERT
s due to the Remote 1 temperature exceeding a programmed limit. Default = 0.
0
Mask R2
Setting this bit to 1 masks ALERT
s due to the Remote 2 temperature exceeding a programmed limit. Default = 0.
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