LM87CIMT National Semiconductor, LM87CIMT Datasheet - Page 11

• Manufacturer Part Number: LM87CIMT
• Description: Temperature Sensor IC
• Manufacturer: National Semiconductor

Specifications of LM87CIMT

• Peak Reflow Compatible (260 C): No
• Ic Function: Temperature Sensor IC
• Supply Voltage Max: 3.8V
• Leaded Process Compatible: No
• Mounting Type: Surface Mount
• Operating Temperature Range: -40°C To +125°C
• Temperature Sensor Function: Temp Sensor
• Interface Type: Serial (2-Wire)
• Output Type: Digital
• Package Type: TSSOP
• Operating Temperature (min): -40C
• Operating Temperature (max): 125C
• Operating Temperature Classification: Automotive
• Operating Supply Voltage (typ): 3.3V
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Internal Temp. Hardware High
Limit
External Temp. Hardware High
Limit
Test Register
Channel Mode Register
Internal Temp. Hardware High
Limit
External Temp. Hardware High
Limit
Value RAM DAC Data Register
Value RAM
Company ID
Revision
Configuration Register 1
Interrupt Status Register 1
Interrupt Status Register 2
Interrupt Mask Register 1
Interrupt Mask Register 2
CI Clear Register
VID0-3/Fan Divisor Register
VID4 Register
Configuration Register 2
Interrupt Status Register 1
Mirror
Interrupt Status Register 2
Mirror
SMBALERT# Enable
2.1 Internal Registers of the LM87
Register
TABLE 1. The internal registers and their corresponding internal LM87 addresses are as follows:
LM87 Internal Hex
Address
1Ah-3Fh
3Eh
3Fh
4Ah
4Ch
4Dh
13h
14h
15h
16h
17h
18h
19h
40h
41h
42h
43h
44h
46h
47h
49h
80h
0101 XXXX
1000 000X
0100 0110
0101 0101
0000 0000
0000 0000
0100 0110
0101 0101
1111 1111
0000 0010
0000 0110
0000 1000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0010 0000
Power on
Value
11
70 °C Default - User adjustable. Lockable by setting bit 1
of register 4Ah.
85 °C Default - User adjustable. Lockable by setting bit 2
of register 4Ah.
70 °C Default - User adjustable.
85 °C Default - User adjustable.
Defaults to full scale DAC setting.
(See Section 13.18) Contains: monitoring results
(temperature, voltages, fan counts), WATCHDOG limits,
and Company/Stepping IDs
This designates the National Semiconductor LM87.
Revisions of this device will start with 1 and increment by
one.
The upper four bits set the divisor for Fan Counters 1 and
2. The lower four bits reflect the state of the VID0-VID3
inputs.
The lower bit reflects the state of VID4 input.
Notes
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