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FM75MM8X Folha de dados(PDF) 9 Page - Fairchild Semiconductor

Nome de Peças FM75MM8X
Descrição Electrónicos  Low Voltage 2-Wire Digital Temperature Sensor with Thermal Alarm
Download  15 Pages
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Fabricante Electrônico  FAIRCHILD [Fairchild Semiconductor]
Página de início  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FM75MM8X Folha de dados(HTML) 9 Page - Fairchild Semiconductor

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PRODUCT SPECIFICATION
FM75
REV. 1.0.5 10/2/03
9
Over-Limit-Signal Temperature Register (TOS)
The TOS Register is a two-byte (16-bit) read/write register
that stores the user-programmable upper trip-point
temperature for the thermal alarm in two’s-complement
format. At power-up this register defaults to 80°C
(i.e., 0101 0000 0000 0000).
The format of the TOS register is identical to that of the
Temperature Register (see Figure 6). The 4 LSBs of the TOS
Register are hardwired to zero, so data written to these
register bits will be ignored. The MSB position of the TOS
Register contains the sign bit for the digital temperature and
bit 14 contains the temperature MSB.
The resolution setting for the T-to-D conversion determines
how many bits of the TOS Register are used by the thermal
alarm. For example, for 9-bit conversions the trip-point
temperature is defined by the 9 MSBs of the TOS register,
and all remaining bits are “don’t cares.”
Hysteresis Temperature Register (THYST)
The THYST Register is a two-byte (16-bit) read/write
register that stores the user programmable lower trip-point
temperature for the thermal alarm in two’s-complement
format. At power-up this register defaults to 75°C (i.e., 0100
1011 0000 0000).
The THYST register is illustrated in Figure 6. The format of
this register is the same as that of the Temperature Register.
The 4 LSBs of the THYST register are hardwired to zero, so
data written to these bits is ignored.
The resolution setting for the T-to-D conversion determines
how many bits of the THYST Register are used by the thermal
alarm. For example, for 9-bit conversions the hysteresis
temperature is defined by the 9 MSBs of the THYST Register,
and all remaining bits are “don’t cares.”
.
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 6. THYST Register and TOS Register Format
SB TMSB T
TTT
T
T
MSB
8
14
13
12
11
10
9
9-bit
LSB
00
0
0
7
LSB
6
5
4
3
2
1
10-bit
LSB
11-bit
LSB
12-bit
LSB


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