LM96063CISDXSLASHNOPB datasheet(23/46 Pages) TI2

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LM96063

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SNIS149B – NOVEMBER 2011 – REVISED MARCH 2013

Address

Read/

POR

Bits

Name

Description

Hex

Write

Value

4CHEX PWM VALUE REGISTER

HPWVAL7:HPWV

PWM High Resolution and Low Resolution Values

7:6

AL6

If PWM Program (register 4A, bit 5) = 0 this register is read only, this register

Read

reflects the LM96063’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

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 at the end of this datasheet for more information regarding

the PWM Value and Duty Cycle in %.

4DHEX FAN PWM FREQUENCY REGISTER

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

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

datasheet.

4EHEX LOOKUP TABLE TEMPERATURE OFFSET

7:6

[Reserved]

These bits are unused and always read as 0.

The temperature offset applied to the temperature values of the lookup table. This

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.

4FHEX LOOKUP TABLE HYSTERESIS

7:5

000

[Reserved]

These bits are unused and always read as 0

Lookup Table Hysteresis

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).

50HEX to 67HEX LOOKUP TABLE (7/8 Bits for Temperature and 6/8 Bits for PWM for each Temperature/PWM Pair)

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

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

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

bit 5 =

Lookup Table PWM Duty Cycle Extended Entry 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

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

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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