LM64EVAL National Semiconductor, LM64EVAL Datasheet - Page 16

• Manufacturer Part Number: LM64EVAL
• Description: BOARD EVALUATION LM64
• Manufacturer: National Semiconductor

Specifications of LM64EVAL

• Sensor Type: Temperature, Fan Controller
• Sensing Range: 0°C ~ 85°C
• Interface: SMBus (2-Wire/I²C)
• Sensitivity: ±1°C
• Voltage - Supply: 3 V ~ 3.6 V
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: LM64
• Lead Free Status / RoHS Status: Not applicable / Not applicable

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Register
0x[HEX]
FAN CONTROL REGISTERS
CONFIGURATION REGISTER
TACHOMETER COUNT AND LIMIT REGISTERS
LOCAL TEMPERATURE AND LOCAL SETPOINT REGISTERS
REMOTE DIODE TEMPERATURE AND SETPOINT REGISTERS
C0–FD
60–BE
50–5F
Register
2.0 LM64 Registers
05 (0B)
07 (0D)
08 (0E)
2.2 LM64 REGISTER MAP IN FUNCTIONAL ORDER
The following is a Register Map grouped in Functional Order. Some address locations have been left blank to maintain
compatibility with LM86. Addresses in parenthesis are mirrors of named address. Reading or writing either address will access
the same 8-bit register. The Fan Control and Configuration Registers are listed first, as there is a required order to setup these
registers first and then setup the others. The detailed explanations of each register will follow the order shown below. POR =
Power-On-Reset.
03 (09)
50–5F
[HEX]
4D
4E
4F
BF
FE
FF
4A
4B
4D
4C
BF
4F
46
47
48
49
00
01
10
12
13
14
19
21
11
Lookup Table Hystersis
Rmt Diode Temp Filter
Stepping/Die Rev. ID
PWM and RPM
Fan Spin-Up Configuration
PWM Frequency
PWM Value
Lookup Table
Lookup Table Hysteresis
Configuration
Tach Count LSB
Tach Count MSB
Tach Limit LSB
Tach Limit MSB
Local Temperature
Local High Setpoint
Remote Temperature MSB
Remote Temperature LSB
Remote Temperature Offset MSB
Remote Temperature Offset LSB
Remote High Setpoint MSB
Remote High Setpoint LSB
Remote Low Setpoint MSB
Remote Low Setpoint LSB
Remote TCRIT Setpoint
Remote TCRIT Hys
Remote Diode Temperature Filter
Manufacturer’s ID
PWM Frequency
Register Name
Lookup Table
[Reserved]
[Reserved]
[Reserved]
(Continued)
Register Name
D7
0
0
0
0
0
Lookup Table of up to 8 PWM and Temp Pairs in 8-bit Registers
D6
0
0
0
0
1
D5
16
0
0
0
0
0
LOOKH4
PWMF4
D4
0
0
1
DATA BITS
Not Used
Not Used
Not Used
(R/W if Override Bit is Set)
LOOKH3
PWMF3
D3
0
0
0
Read/Write
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
LOOKH2
PWMF2
RDTF1
D2
0
0
LOOKH1
PWMF1
RDTF0
D1
0
0
POR Default
See Table
46 (70˚C)
55 (85˚C)
0A (10˚C)
00 (0˚C)
46 (70˚)
[HEX]
N/A
N/A
N/A
N/A
N/A
20
3F
17
00
04
00
FF
FF
00
00
00
00
00
ALTCOMP
LOOKH0
PWMF0
D0
1
1