LM63CIMA National Semiconductor, LM63CIMA Datasheet - Page 20

• Manufacturer Part Number: LM63CIMA
• Manufacturer: National Semiconductor

Specifications of LM63CIMA

• Temperature Sensor Function: Temp Sensor
• Interface Type: Serial (2-Wire)
• Output Type: Digital
• Package Type: SOIC N
• Operating Temperature (min): 0C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.6V
• Lead Free Status / Rohs Status: Not Compliant

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47
and ensure MSB and LSB are from the same reading)
49
00
05 (0B)
Address
Address
Tachometer Count And Limit Registers
Local Temperature And Local High Setpoint Registers
HEX
HEX
HEX
Hex
Hex
47
46
49
48
00
05
TACHOMETER COUNT (MSB) and 46
TACHOMETER LIMIT (MSB) and 48
LOCAL TEMPERATURE REGISTER (8-bits)
HEX
LOCAL HIGH SETPOINT REGISTER (8-bits)
Read/
Read/
Write
Write
Read
Read
Read
Read
Only
Only
Only
Only
R/W
R/W
R/W
R/W
Bits
Bits
7:0
7:2
1:0
7:0
7:2
1:0
7:0
7:0
Value
Value
POR
0xFF
0xFF
POR
0x46
(70°)
N/A
N/A
N/A
00
Local Temperature
Reading (8-bit)
Count (MSB)
Count (LSB)
Tachometer
Tachometer
Tachometer
Tachometer
Tachometer
Edge Count
Local HIGH
Limit (LSB)
Limit MSB)
[Reserved]
Setpoint
Name
Name
HEX
HEX
TACHOMETER LIMIT (LSB) REGISTERS
TACHOMETER COUNT (LSB) REGISTERS (16 bits: Read LSB first to lock MSB
These registers contain the current 16-bit Tachometer Count, representing the
period of time between tach pulses.
Note that the 16-bit tachometer MSB and LSB are reversed from the 16-bit
temperature readings.
Note: If PWM_Clock_Select = 360 kHz, then Tach_Count_Multiple = 1
regardless of the setting of these bits.
These registers contain the current 16-bit Tachometer Count, representing the
period of time between tach pulses. Fan RPM = (f * 5,400,000) / (Tachometer
Count), where f = 1 for 2 pulses/rev fan; f = 2 for 1 pulse/rev fan; and f = 2/3 for
3 pulses/rev fan. See the Applications Notes section for more tachometer
information. Note that the 16-bit tachometer MSB and LSB are reversed from
the 16 bit temperature readings.
Not Used.
8-bit integer representing the temperature of the LM63 die.
High Setpoint for the internal diode.
Bits
00:
01:
10:
11:
20
Edges Used
2
3
5
Description
Description
Reserved - do not use
Tach_Count_Multiple
4
2
1