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参数资料
| 型号： | NCT1008DMT3R2G |
| 厂商： | ON SEMICONDUCTOR |
| 元件分类： | 模拟信号调理 |
| 英文描述： | %2B-1℃ temperature monitor with series resistance cancellation |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, DSO8 |
| 封装： | 2 X 2 MM, 0.50 MM PITCH, LEAD FREE, DFN-8 |
| 文件页数： | 20/20页 |
| 文件大小： | 251K |
| 代理商： | NCT1008DMT3R2G |
NCT1008
http://onsemi.com
9
Table 2. Temperature Data Format
(Temperature High Byte)
Temperature
Binary
Offset Binary (Note 1)
–55°C
0 000 0000
(Note 2)
0 000 1001
0°C
0 000 0000
0 100 0000
+1°C
0 000 0001
0 100 0001
+10°C
0 000 1010
0 100 1010
+25°C
0 001 1001
0 101 1001
+50°C
0 011 0010
0 111 0010
+75°C
0 100 1011
1 000 1011
+100°C
0 110 0100
1 010 0100
+125°C
0 111 1101
1 011 1101
+127°C
0 111 1111
1 011 1111
+150°C
0 111 1111
(Note 3)
1 101 0110
1. Offset binary scale temperature values are offset by 64°C.
2. Binary scale temperature measurement returns 0°C for all
temperatures < 0°C.
3. Binary scale temperature measurement returns 127°C for all
temperatures > 127°C.
The user can switch between measurement ranges at any
time. Switching the range likewise switches the data format.
The next temperature result following the switching is
reported back to the register in the new format. However, the
contents of the limit registers do not change. It is up to the
user to ensure that when the data format changes, the limit
registers are reprogrammed as necessary. More information
on this is found in the Limit Registers section.
NCT1008 Registers
The NCT1008 contains 22, 8bit registers in total. These
registers store the results of remote and local temperature
measurements, high and low temperature limits, and
configure and control the device. See the Address Pointer
Register section through the Consecutive ALERT Register
section of this data sheet for more information on the
NCT1008 registers. Additional details are shown in Table 3
through Table 7. The entire register map is available in
Table 8.
Address Pointer Register
The address pointer register itself does not have, nor does
it require, an address because 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 NCT1008 that is stored in the address pointer
register. It is to this register address that the second byte of
a write operation is written, or to which a subsequent read
operation is performed.
The poweron default value of the address pointer register
is 0x00. Therefore, if a read operation is performed
immediately after poweron, without first writing to the
address pointer, the value of the local temperature is returned
because its register address is 0x00.
Temperature Value Registers
The NCT1008 has three 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
by the user over the SMBus/I2C. The local temperature
value register is at Address 0x00.
The external temperature value high byte register is at
Address 0x01, with the low byte register at Address 0x10.
The poweron default for all three registers is 0x00.
Configuration Register
The configuration register is Address 0x03 at read and
Address 0x09 at write. Its poweron default is 0x00. Only
four bits of the configuration register are used. Bit 0, Bit 1,
Bit 3, and Bit 4 are reserved; the user does not write to them.
Bit 7 of the configuration register masks the ALERT
output. If Bit 7 is 0, the ALERT output is enabled. This is the
poweron default. If Bit 7 is set to 1, the ALERT output is
disabled. This applies only if Pin 6 is configured as ALERT.
If Pin 6 is configured as THERM2, then the value of Bit 7
has no effect.
If Bit 6 is set to 0, which is poweron default, the device
is in operating mode with ADC converting. If Bit 6 is set to
1, the device is in standby mode and the ADC does not
convert. The SMBus does, however, remain active in
standby mode; therefore, values can be read from or written
to the NCT1008 via the SMBus. The ALERT and THERM
outputs are also active in standby mode. Changes made to
the registers in standby mode that affect the THERM or
ALERT outputs cause these signals to be updated.
Bit 5 determines the configuration of Pin 6 on the
NCT1008. If Bit 5 is 0 (default), then Pin 6 is configured as
an ALERT output. If Bit 5 is 1, then Pin 6 is configured as
a THERM2 output. Bit 7, the ALERT mask bit, is only active
when Pin 6 is configured as an ALERT output. If Pin 6 is set
up as a THERM2 output, then Bit 7 has no effect.
Bit 2 sets the temperature measurement range. If Bit 2 is
0 (default value), the temperature measurement range is set
between 0
°C to +127°C. Setting Bit 2 to 1 sets the
measurement range to the extended temperature range
(64
°C to +191°C).
Table 3. Configuration Register Bit Assignments
Bit
Name
Function
PowerOn
Default
7
MASK1
0 = ALERT Enabled
1 = ALERT Masked
0
6
RUN/STOP
0 = Run
1 = Standby
0
5
ALERT/
THERM2
0 = ALERT
1 = THERM2
0
4, 3
Reserved
0
2
Temperature
Range Select
0 = 0°C to 127°C
1 = Extended range
0
1, 0
Reserved
0
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