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參數資料
| 型號： | FM75MM8X |
| 廠商： | Fairchild Semiconductor Corporation |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Low Voltage 2-Wire Digital Temperature Sensor with Thermal Alarm |
| 中文描述： | 低電壓2 - Wire數字溫度傳感器，熱報警器 |
| 文件頁數： | 7/15頁 |
| 文件大小： | 532K |
| 代理商： | FM75MM8X |
PRODUCT SPECIFICATION
FM75
REV. 1.0.5 10/2/03
7
Registers
The FM75 contains the following five registers:
1.
Command Register
2.
Temperature Register
3.
Configuration Register
4.
Over-Limit-Signal Temperature Register (T
OS
)
5.
Hysteresis Temperature Register (T
HYST
)
All of these registers can be accessed by the user via the
digital serial interface at any time (see Serial Interface
Operation for instructions). A detailed description of these
registers and their functions is provided in the following
paragraphs. A diagram of the register hierarchy is shown in
Figure 2.
Command Register
The Command Register is a one-byte (8-bit) write-only
register. The data stored in the Command Register indicates
which of the other four registers (Temperature, Configura-
tion, T
OS
, or T
HYST
) the user intends to read from or
write to during an upcoming operation. In other words the
Command Register “points” to the selected register as shown
in Figure 2.
The Command Register is illustrated in Figure 3. The P1 and
P0 bits of the Command Register determine which register is
to be accessed as shown in Table 2. The six MSBs of the
Command Register must always be zero. Writing a 1 into
any of these bits will cause the current operation to be
terminated.
The Command Register retains pointer information between
operations. Therefore, this register only needs to be updated
once for consecutive read operations from the same register.
All bits in the Command Register default to zero at
power-up.
Figure 2. FM75 Register Hierarchy
Serial Interface
Command Register
1-byte Write Only
Temperature Register
2-byte Read Only
Command Reg. = 00000000
Configuration Register
1-byte Read/Write
Command Reg. = 00000001
T
HYST
Register
2-byte Read/Write
Command Reg. = 00000010
T
OS
Register
2-byte Read/Write
Command Reg. = 00000011
Command
(‘Pointer’)
Data
Read/Write
Data
SDA
SCL
Figure 3. Command Register Format
Table 2. Register Assignments for Command
Bits P1 and P2
0
0
0
0
0
0
P1 P0
MSB
LSB
Register
Temperature Register
Configuration Register
T
HYST
Register
T
OS
Register
P1
0
0
1
1
P0
0
1
0
1
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