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參數(shù)資料
| 型號(hào)： | FM75MM8 |
| 英文描述： | DIGITAL THERMOMETER|CMOS|TSSOP|8PIN |
| 中文描述： | 數(shù)字溫度計(jì)|的CMOS | TSSOP封裝| 8引腳 |
| 文件頁(yè)數(shù)： | 6/14頁(yè) |
| 文件大?。?/td> | 2067K |
| 代理商： | FM75MM8 |
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F
www.fairchildsemi.com
FM75 Rev. A.4
Figure 2. FM75 Register Hierarchy
Figure 3. Command Register Format
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
Register
2HYST
Command Reg. = 00000010
Register
2-bOS
Command Reg. = 00000011
Command
('Pointer')
Data
Read/Write
Data
SDA
SCL
0
0
0
0
0
0
P1 P0
MSB
LSB
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, Configuration, 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.
Table 2. Register Assignments for
Command Bits P1 and P2
Register
P1
P0
Temperature Register
0
0
Configuration Register
0
1
T
HYST
Register
1
0
T
OS
Register
1
1
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