LM96000CIMT/NOPB National Semiconductor, LM96000CIMT/NOPB Datasheet - Page 12

• Manufacturer Part Number: LM96000CIMT/NOPB
• Description: IC HDWR MON W/FAN CTRL 24-TSSOP
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM96000CIMT/NOPB

• Function: Fan Control, Temp Monitor
• Topology: ADC (Sigma Delta), Comparator, Fan Control, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: 0°C ~ 85°C, External Sensor
• Output Type: SMBus™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP
• Ic Output Type: Digital
• Sensing Accuracy Range: ± 2.5°C
• Temperature Sensing Range: 0°C To +85°C
• Supply Current: 530µA
• Supply Voltage Range: 3V To 3.6V
• Resolution (bits): 8bit
• Sensor Case Style: TSSOP
• No. Of Pins: 24
• Rohs Compliant: Yes
• Accuracy %: 3°C
• For Use With: LM96000EVAL - BOARD EVALUATION LM96000
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *LM96000CIMT; *LM96000CIMT/NOPB; LM96000CIMT

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Register
Address
20h
21h
22h
23h
24h
Register
Address
25h
26h
27h
4.1 Register 20-24h: Voltage Reading
The Register Names difine the typical input voltage at which the reading is ¾ full scale or C0h.
The Voltage Reading registers are updated automatically by the LM96000 at a minimum frequency of 4 Hz. These registers are
read only — a write to these registers has no effect.
4.2 Register 25-27h: Temperature Reading
The Temperature Reading registers reflect the current temperatures of the internal and remote diodes. Processor (Zone1) Temp
register reports the temperature measured by the thermal diode connected to the Remote1− and Remote1+ pins, Remote (Zone3)
Temp register reports the temperature measured by the thermal diode connected to the the Remote2− and Remote2+ pins, and
the Internal (Zone2) Temp register reports the temperature measured by the internal (junction) temperature sensor. Temperatures
are represented as 8 bit, 2’s complement, signed numbers, in Celsius, as shown below in Table 1. The Temperature Reading
register will return a value of 80h if the remote diode pins are not used by the board designer or are not functioning properly. This
reading will cause the zone limit bit(s) (bits 6 and 4) in the Interrupt Status Register (41h) and the remote diode fault status bit(s)
(bit 6 or 7) in the Interrupt Status Register 2 (42h) to be set. The Temperature Reading registers are updated automatically by the
LM96000 at a minimum frequency of 4 Hz. These registers are read only — a write to these registers has no effect.
Read/
Write
R
R
R
Read/
Write
R
R
R
R
R
Register
Name
Processor (Zone1) Temp
Internal (Zone2) Temp
Remote (Zone3) Temp
Register
Name
2.5V
VCCP
3.3V
5V
12V
(SENSOR ERROR)
Temperature
Bit 7
(MSB)
7
7
7
7
7
TABLE 1. Temperature vs Register Reading
−127°C
−50°C
127°C
0°C
.
.
.
.
.
.
.
.
.
Bit 6
6
6
6
6
6
Bit 7
(MSB)
7
7
7
Reading (Dec)
Bit 5
5
5
5
5
5
12
Bit 6
6
6
6
−127
−50
127
0
.
.
.
.
.
.
.
.
.
Bit 4
4
4
4
4
4
Bit 5
5
5
5
Reading (Hex)
Bit 3
3
3
3
3
3
Bit 4
4
4
4
CEh
7Fh
81h
00h
80h
.
.
.
.
.
.
.
.
.
Bit 3
3
3
3
Bit 2
2
2
2
2
2
Bit 2
2
2
2
Bit 1
1
1
1
1
1
Bit 1
1
1
1
Bit 0
(LSB)
0
0
0
0
0
Bit 0
(LSB)
0
0
0
Default
Value
N/A
N/A
N/A
N/A
N/A
Default
Value
N/A
N/A
N/A