Datasheet

LM96163
SNAS433D JUNE 2008REVISED MAY 2013
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Address Read/ POR
Bits Name Description
Hex Write Value
4C
HEX
PWM VALUE REGISTER
HPWVAL7:HPWV PWM High Resolution and Low Resolution Values
7:6 00
AL6 If PWM Program (register 4A, bit 5) = 0 this register is read only, this register
Read
reflects the LM96163’s current PWM value from the Lookup Table.
(Write
If PWM Program (register 4A, bit 5) = 1, this register is read/write and the desired
only if
4C PWM value is written directly to this register, instead of from the Lookup Table, for
reg 4A
direct fan speed control.
5:0 0x00 PWVAL5:PWVAL0
bit 5 =
This register will read 0 during the Spin-Up cycle.
1.)
See Application Notes section at the end of this datasheet for more information
regarding the PWM Value and Duty Cycle in %.
4D
HEX
FAN PWM FREQUENCY REGISTER
R 7:5 000 [Reserved] These bits are unused and always read as 0
PWM Output Frequency
The PWM Frequency = PWM_Clock / 2n, where PWM Master Clock = 360 kHz or
4D
R/W 4:0 0x17 PWMF4:PWMF0 1.4 kHz (per the PWM Master Clock Select bit in Register 4A), and n = value of the
register. Note: n = 0 is mapped to n = 1. See the Application Note at the end of this
datasheet.
4E
HEX
LOOKUP TABLE TEMPERATURE OFFSET
R 7:6 00 [Reserved] These bits are unused and always read as 0.
The temperature offset applied to the temperature values of the lookup table. This
4E
offset allows the lookup table temperature settings to be extended above 127°C.
R/W 5:0 0x00 TO5:TO0
The value, which is always positive, has an unsigned format with 1°C resolution.
The maximum offset that can be programmed is +63°C.
4F
HEX
LOOKUP TABLE HYSTERESIS
R 7:5 000 [Reserved] These bits are unused and always read as 0
Lookup Table Hysteresis
4F
R/W 4:0 0x04 LOOKH4:LOOKH0 The amount of hysteresis applied to the Lookup Table. (1 LSb = 1°C, max value
31°C, default value 10°C).
50
HEX
to 67
HEX
LOOKUP TABLE (7/8 Bits for Temperature and 6/8 Bits for PWM for each Temperature/PWM Pair)
7 0 E1T7 Lookup Table Temperature Entry 1
Bit 7 is unused and always set to 0 in the low resolution temperature LUT mode. In
the high resolution temperature LUT mode bit 7 in conjunction with bits 6:0 of this
register are used to determine the limit temperature that the remote diode
temperature is compared to. In high resolution the range is 0°C to 127.5°C. In low
resolution mode the range is 0°C to 127°C. If the remote diode temperature
50
exceeds this value, the PWM output will be the value in Register 0x51. Only 9-bits
6:0 0x7F E1T6:E1T0
of the temperature reading are used in high resolution and 8-bits in low resolution.
Read.
Only positive temperature values can be programed in this register and in all cases
(Write
the sign bit is assumed to be zero. Temperatures greater than 127 °C or 127.5 °C
only if
can be programmed through the use of the Lookup Table Temperature Offset
reg 4A
Register (4Eh).
bit 5 =
Lookup Table PWM Duty Cycle Extended Entry 1
1)
These bits are unused and always set to 0 in the low resolution duty cycle LUT
mode. In the high resolution duty cycle LUT mode these bits in association with
7:6 00 E1D7:E1D6
bits 5:0 of this register are used for the PWM value associated with the
temperature limit in register 0x50. These bits can only be activated when PWM
51
frequency of 22.5kHz is chosen.
Lookup Table PWM Duty Cycle Entry 1
5:0 0x3F E1D5:E1D0 The PWM value corresponding to the temperature limit in register 0x50 for the low
resolution PWM mode.
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