LM75AIMX/NOPB National Semiconductor, LM75AIMX/NOPB Datasheet - Page 11

• Manufacturer Part Number: LM75AIMX/NOPB
• Description: IC TEMP SENSOR WATCHDOG 8-SOIC
• Manufacturer: National Semiconductor

Specifications of LM75AIMX/NOPB

• Function: Temp Sensor, Watchdog
• Topology: ADC (Sigma Delta), Comparator, Register Bank
• Sensor Type: Internal
• Sensing Temperature: -55°C ~ 125°C
• Output Type: I²C™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Temperature Sensor Function: Temp Sensor
• Interface Type: Serial (2-Wire)
• Resolution: 9b
• Package Type: SOIC N
• Operating Temperature (max): 125C
• Operating Temperature Classification: Military
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• For Use With: OM6285 - EVAL BOARD I2C-2002-1A568-4002 - DEMO BOARD I2C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM75AIMX

1.11 POINTER REGISTER (Selects which registers will be read from or written to):
P0-P1: Register Select:
P3–P7: Must be kept zero.
1.12 TEMPERATURE REGISTER (Read Only):
D0–D6: Undefined.
1.13 CONFIGURATION REGISTER (Read/Write):
Power up default is with all bits “0” (zero).
D0: Shutdown: When set to 1 the LM75A goes to low power shutdown mode.
D1: Comparator/Interrupt mode: 0 is Comparator mode, 1 is Interrupt mode.
D2: O.S. Polarity: 0 is active low, 1 is active high. O.S. is an open-drain output under all conditions.
D3–D4: Fault Queue: Number of faults necessary to detect before setting O.S. output to avoid false tripping due to noise. Faults
are determine at the end of a conversion. See specified temperature conversion time in the electrical tables.
D5–D7: These bits are used for production testing and must be kept zero for normal operation.
1.14 T
D0–D6: Undefined
1.15 PRODID: PRODUCT ID REGISTER
(Read Only) Pointer Address: 07h
D4--D7 Product Identification Nibble. Always returns Ah to uniquely identify this part as the LM75A.
D0--D3 Die Revision Nibble. Returns 1h to uniquely identify the revision level as one.
MSB
MSB
D15
D15
HYST
Bit 7
Bit 7
D14
D14
AND T
Bit 6
Bit 6
D13
D13
OS
D7
REGISTER (Read/Write):
0
D7
1
D7–D15: T
Bit 5
Bit 5
P2
D12
D12
0
0
0
0
1
D7–D15: Temperature Data. One LSB = 0.5°C. Two's complement format.
P7
0
D6
0
Bit 4
Bit 4
D11
D11
D6
0
P1
0
0
1
1
1
HYST
P6
0
D5
0
Or T
Bit 3
Bit 3
D10
D10
P0
D4
0
1
0
1
1
OS
D5
0
0
1
1
P5
1
0
Trip Temperature Data. Power up default is T
Bit 2
D4
Fault Queue
Bit 2
D9
D9
Temperature (Read only) (Power-up default)
Configuration (Read/Write)
T
T
Product ID Register
HYST
OS
D3
0
1
0
1
P4
(Read/Write)
0
D4
Bit 1
Bit 1
0
(Read/Write)
D8
D8
D3
11
1 (Power-up default)
Number of Faults
P3
LSB
LSB
0
D7
D7
D3
0
O.S. Polarity
2
4
6
Register
D6
D6
X
D2
X
P2
D2
0
Register Select
D5
D5
X
X
P1
Cmp/Int Shutdown
D4
D4
D1
X
X
D1
0
OS
= 80°C, T
P0
D3
D3
X
X
D0
D0
1
HYST
D2
D2
X
X
= 75°C
D1
D1
X
X
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D0
D0
X
X