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參數(shù)資料
| 型號(hào)： | FM75M8 |
| 英文描述： | DIGITAL THERMOMETER|CMOS|SOP|8PIN |
| 中文描述： | 數(shù)字溫度計(jì)|的CMOS |?？苵 8引腳 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 2067K |
| 代理商： | FM75M8 |
7
F
www.fairchildsemi.com
FM75 Rev. A.4
Temperature Register
The Temperature Register is a two-byte (16-bit) read-only regis-
ter. Digital temperatures from the T-to-D converter are stored in
the Temperature Register in two
’
s complement format, and the
contents of this register are updated at regular intervals
—
i.e.,
each time the T-to-D conversion is finished.
The user can read data from the Temperature Register at any
time. When a T-to-D conversion is completed, the new data is
loaded into a comparator buffer to evaluate fault conditions, and
will update the Temperature Register is a read cycle is not
ongoing. The FM75 is continuously evaulating fault conditions
regardless of read or write activity on the bus. If a read is ongoing,
the previous temperature will be read. The readable temperature
will be updated upon the completion of the next T-to-D conversion
that is not masked by a read cycle.
The Temperature Register is illustrated in Figure 4. Depending on
the resolution of the T-to-D conversion, the 9, 10, 11 or 12 MSBs
of the register will contain temperature data. All unused bits
following the digital temperature will be zero. The MSB position of
the Temperature Register always contains the sign bit for the
digital temperature and bit 14 contains the temperature MSB. All
bits in the Temperature Register default to zero at power-up.
SB
TMSB
T
T
T
T
T
T
MSB
8
14
13
12
11
10
9
9-bit
LSB
0
0
0
0
7
LSB
6
5
4
3
2
1
10-bit
LSB
11-bit
LSB
12-bit
LSB
SB = Two's complement sign bit
TMSB = Temperature MSB
T = Temperature data
9-bit LSB = Temperature LSB for 9-bit conversions
10-bit LSB = Temperature LSB for 10-bit conversions
11-bit LSB = Temperature LSB for 11-bit conversions
12-bit LSB = Temperature LSB for 12-bit conversions
Figure 4. Temperature Register Format
Configuration Register
The Configuration Register is a one-byte (8-bit) read/write register
(see Figure 5). This register allows the user to control the FM75
Shutdown Mode as well as the following thermal alarm features:
polarity, operating mode, and fault tolerance. The Configuration
Register contains two bits that set the fault tolerance trip point. The
fault tolerance trip point is the number of consecutive times the
internal circuit reads the temperature and finds the tempterature
outside the limits programmed. The programmed limited are
defined by the T
OS
Register for the upper limit, and by the T
HYST
Register for the lower limit. Table 4 shows the relationship
between F1 and F0 and the number of consecutive errors or "trips"
needed to activate the alarm. The Configuration Register also
contains the two bits that set the T-to-D conversion resolution to
9, 10, 11, or 12 bits. Table 3 shows the relationship between R1
and T0 and the conversion resolution. All bits in the configuration
register default to zero at power-up.
MSB
6
5
4
R1 = Resolution bit 1. (See Table 3)
R0 = Resolution bit 0. (See Table 3)
F1 = Fault tolerance bit 1. (See Table 4)
F0 = Fault tolerance bit 0. (See Table 4)
POL = O.S. output polarity. 0 = active low, 1 = active high.
CMP/INT = Thermostat mode. 0 = comparator mode, 1 = interrupt mode.
SD = Shutdown. 0 = normal operation, 1 = shutdown mode.
Figure 5. Configuration Register Format
Table 3. Conversion Resolution Settings
A-to-D Conversion
Resolution
R1
R0
9 Bits
0
0
10 Bits
0
1
11 Bits
1
0
12 Bits
1
1
Table 4. Fault Tolerance Settings
Fault Tolerance
F1
F0
1
0
0
2
0
1
4
1
0
6
1
1
X R1 R0 F1 F0
POL
CMP/
INT
SD
LSB
3
2
1
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