FM75M8 Fairchild Semiconductor, FM75M8 Datasheet - Page 10

• Manufacturer Part Number: FM75M8
• Description: TEMPERATURE SENSOR LV 8SOIC
• Manufacturer: Fairchild Semiconductor

Specifications of FM75M8

• Function: Temp Monitoring System (Sensor)
• Topology: ADC (Sigma Delta), Comparator, Register Bank
• Sensor Type: Internal
• Sensing Temperature: -40°C ~ 125°C
• Output Type: SMBus™
• Output Alarm: Yes
• Output Fan: No
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Full Temp Accuracy: 4 C
• Digital Output - Bus Interface: I2C, SMBus
• Digital Output - Number Of Bits: 9 bit to 12 bit
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Description/function: Semiconductor
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Supply Current: 500 uA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

© 2006 Fairchild Semiconductor Corporation
FM75 Rev. 1.0.8
Over-Limit Signal Temperature Register (T
The T
that stores the user-programmable upper trip-point tem-
perature for the thermal alarm in two’s-complement for-
mat. At power-up, this register defaults to 80°C (i.e. 0101
0000 0000 0000).
The format of the T
temperature register (see Figure 9). The four LSBs of the
T
these register bits is ignored. The MSB position of the
T
ture and bit 14 contains the temperature MSB.
The resolution setting for the T-to-D conversion deter-
mines how many bits of the T
thermal alarm. For example, for 9-bit conversions, the
trip-point temperature is defined by the nine MSBs of the
T
OS
OS
OS
register and all remaining bits are ignored.
register contains the sign bit for the digital tempera-
register are hardwired to zero, so data written to
OS
register is a two-byte (16-bit) read/write register
OS
register is identical to that of the
OS
Figure 9. T
register are used by the
MSB
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
SB
9-bit
LSB
TMSB
7
14
HYST
10-bit
LSB
6
13
T
Register and T
OS
11-bit
LSB
)
5
12
T
10
12-bit
LSB
4
11
T
Hysteresis Temperature Register (T
The T
ter that stores the programmable lower trip-point temper-
ature 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 T
of this register is the same as that of the temperature
register. The four LSBs of the T
wired to zero, so data written to these bits is ignored.
The resolution setting for the T-to-D conversion deter-
mines how many bits of the T
the thermal alarm. For example, for 9-bit conversions,
the hysteresis temperature is defined by the nine MSBs
of the T
.
OS
0
3
10
HYST
T
HYST
Register Format
HYST
0
register is a two-byte (16-bit) read/write regis-
2
register is illustrated in Figure 9. The format
T
9
register and all remaining bits are ignored.
0
1
T
8
LSB
0
HYST
HYST
register are used by
register are hard-
HYST
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