Datasheet

LM96163
SNAS433D –JUNE 2008–REVISED MAY 2013 www.ti.com
Address Read/ POR
Bits Name Description
Hex Write Value
49
HEX
TACHOMETER LIMIT (MSB) and 48
HEX
TACHOMETER LIMIT (LSB) REGISTERS
49 R/W 7:0 0xFF TACL13:TACL6 Tachometer Limit (MSB and LSB)
These registers contain the current 14-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
R/W 7:2 TACHL5:TACL0
pulses/rev fan. See the Applications Notes section for more tachometer
48 0xFF
information. Note that the 16-bit tachometer MSB and LSB register addresses are
in reverse order from the 16 bit temperature readings.
R/W 1:0 [Reserved] These bits are not used and write 0 or 1.
Local Temperature and Local High Setpoint Registers
Address Read/ POR
Bits Name Description
Hex Write Value
00
HEX
LOCAL TEMPERATURE REGISTER (8-bits)
Local Temperature Reading (8-bit)
8-bit integer representing the temperature of the LM96163 die.
LT7 is the SIGN bit
LT6 has a bit weight of 64°C
LT5 has a bit weight of 32°C
00 R 7:0 N/A LT7:LT0
LT4 has a bit weight of 16°C
LT3 has a bit weight of 8°C
LT2 has a bit weight of 4°C
LT1 has a bit weight of 2°C
LT0 has a bit weight of 1°C
05 (0B)
HEX
LOCAL HIGH SETPOINT REGISTER (8-bits)
Local HIGH Setpoint
High Setpoint for the internal diode.
LHS7 is the SIGN bit
LHS6 has a bit weight of 64°C
0x46 LHS5 has a bit weight of 32°C
05 R/W 7:0 LHS7:LHS0
(70°) LHS4 has a bit weight of 16°C
LHS3 has a bit weight of 8°C
LHS2 has a bit weight of 4°C
LHS1 has a bit weight of 2°C
LHS0 has a bit weight of 1°C
Remote Diode Temperature, Offset and Setpoint Registers
Address Read/ POR
Bits Name Description
Hex Write Value
01
HEX
AND 10
HEX
SIGNED REMOTE DIODE TEMPERATURE REGISTERS
Most Significant Byte of the Signed Remote Diode Temperature Reading
The most significant 8-bits of the 2’s complement value, representing the
01 R 7:0 N/A RT12:RT5 temperature of the remote diode connected to the LM96163. Bit 7 is the sign bit,
bit 6 has a weight of 64°C, and bit 0 has a weight of 1°C. This byte to be read
before the LSB.
Least Significant Byte of the Signed Remote Diode Temperature Reading
This is the LSB of the 2’s complement value, representing the temperature of the
remote diode connected to the LM96163. RT4 has a weight 0.5°C, RT3 has a
weight of 0.25°C, and RT2 has a weight of 0.125°C. If the digital filter is turned off
7:3 N/A RT4:RT0 RT1:RT0 have a value of 00 unless extended resolution (Reg 45h STFBE bit set)
10 R
is enabled. If extended resolution is chosen, for readings greater than 127.875
RT1:RT0=11 and for other cases RT1:RT0=00. When the digital filter is turned on
and extended resolution enabled: RT1 has a weight of 0.0625 and RT0 has a
weight of 0.03125°C
2:0 00 [Reserved] These bits are unused and always read as 0.
30 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated
Product Folder Links: LM96163