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参数资料
| 型号： | NCT72DMTR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/20页 |
| 文件大小： | 326K |
| 描述： | IC REMOTE THERMAL SENSOR 8-WDFN |
| 标准包装： | 1 |
| 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： | 0°C ~ 127°C，-64°C ~ 191°C |
| 精确度： | ±2.5°C |
| 拓扑： | ADC，比较器，多路复用器，寄存器库 |
| 输出类型： | 2 线串行，I²C?/SMBUS? |
| 输出警报： | 是 |
| 输出风扇： | 是 |
| 电源电压： | 2.8 V ~ 3.6 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN |
| 供应商设备封装： | 8-WDFN（2x2） |
| 包装： | 标准包装 |
| 其它名称： | NCT72DMTR2GOSDKR |
NCT72
http://onsemi.com
12
Table 13. LIST OF REGISTERS
Read Address (Hex)
Write Address (Hex)
Name
Power-on Default
Not Applicable
Not Applicable
Address Pointer
Undefined
00
Not Applicable
Local Temperature Value
0000 0000 (0x00)
01
Not Applicable
External Temperature Value High Byte
0000 0000 (0x00)
02
Not Applicable
Status
Undefined
03
09
Configuration
0000 0000 (0x00)
04
0A
Conversion Rate
0000 1000 (0x08)
05
0B
Local Temperature High Limit
0101 0101 (0x55) (85癈)
06
0C
Local Temperature Low Limit
0000 0000 (0x00) (0癈)
07
0D
External Temperature High Limit High Byte
0101 0101 (0x55) (85癈)
08
0E
External Temperature Low Limit High Byte
0000 0000 (0x00) (0癈)
Not Applicable
0F (Note 1)
One-shot
10
Not Applicable
External Temperature Value Low Byte
0000 0000
11
11
External Temperature Offset High Byte
0000 0000
12
12
External Temperature Offset Low Byte
0000 0000
13
13
External Temperature High Limit Low Byte
0000 0000
14
14
External Temperature Low Limit Low Byte
0000 0000
19
19
External THERM
Limit
0110 1100 (0x6C) (108癈)
20
20
Local THERM
Limit
0101 0101 (0x55) (85癈)
21
21
THERM
Hysteresis
0000 1010 (0x0A) (10癈)
22
22
Consecutive ALERT
0000 0001 (0x01)
FE
Not Applicable
Manufacturer ID
0100 0001 (0x41)
1. Writing to Address 0x0F causes the NCT72 to perform a single measurement. It is not a data register, and it does not matter what data is
written to it.
Serial Bus Interface
Control of the NCT72 is carried out via the serial bus. The
NCT72 is connected to this bus as a slave device, under the
control of a master device.
The NCT72 has an SMBus/I
2
C timeout feature. When this
is enabled, the SMBus/I
2
C times out after typically 25 ms of
no activity. However, this feature is not enabled by default.
Bit 7 of the consecutive alert register (Address = 0x22)
should be set to enable it.
Addressing the Device
In general, every SMBus/I
2
C device has a 7-bit device
address, except for some devices that have extended 10-bit
addresses. When the master device sends a device address
over the bus, the slave device with that address responds.
The NCT72 is available with one device address, 0x4C
(1001 100b). An NCT72D is also available.
The NCT72D has an SMBus/I
2
C address of 0x4D
(1001 101b). This is to allow two NCT72 devices on the
same bus, or if the default address conflicts with an existing
device on the SMBus/I
2
C. The serial bus protocol operates
as follows:
1. The master initiates a data transfer by establishing
a start condition, defined as a high-to-low
transition on SDATA, the serial data line, while
SCLK, the serial clock line, remains high. This
indicates that an address/data stream follows. All
slave peripherals connected to the serial bus
respond to the start condition and shift in the next
eight bits, consisting of a 7-bit address (MSB first)
plus an R/W
bit, which determines the direction of
the data transfer, that is, whether data is written to,
or read from, the slave device. The peripheral
whose address corresponds to the transmitted
address responds by pulling the data line low
during the low period before the ninth clock pulse,
known as the acknowledge bit. All other devices
on the bus remain idle while the selected device
waits for data to be read from or written to it. If the
R/W
bit is a 0, the master writes to the slave
device. If the R/W
bit is a 1, the master reads from
the slave device.
2. Data is sent over the serial bus in a sequence of
nine clock pulses, eight bits of data followed by an
acknowledge bit from the slave device. Transitions
on the data line must occur during the low period
of the clock signal and remain stable during the
high period, since a low-to-high transition when
the clock is high can be interpreted as a stop
signal. The number of data bytes that can be
transmitted over the serial bus in a single read or
write operation is limited only by what the master
and slave devices can handle.
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