ADT7467BBZEVB【PDF 29/72 页】BOARD EVALUATION FOR ADT7467

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ADT7467

PWM Logic State

The PWM outputs can be programmed high for 100%

duty cycle (non-inverted) or programmed low for 100%

duty cycle (inverted).

Table 33. PWM1 TO PWM3 CONFIGURATION

(REG. 0X5C TO 0X5E) BITS

In manual fan speed control mode, the ADT7467 allows

the duty cycle of any PWM output to be manually adjusted.

This can be useful if the user wants to change fan speed in

software or adjust PWM duty cycle output for test purposes.

Bits <7:5> of Register 0x5C to Register 0x5E (PWM

Configuration) control the behavior of each PWM output.

Bit

<4>

Mnemonic

INV

Description

0 = logic high for 100% PWM duty cycle

1 = logic low for 100% PWM duty cycle

Table 35. PWM1 TO PWM3 CONFIGURATION

(REG. 0X5C TO 0X5E) BITS

Bit Mnemonic Description

Low Frequency Mode PWM Drive Frequency

<7:5>

BHVR

111 = Manual Mode

The PWM drive frequency can be adjusted for the

application. Register 0x5F to Register 0x61 configure the

PWM frequency for PWM1 to PWM3, respectively. In high

frequency mode, the PWM drive frequency is 22.5 kHz and

cannot be changed.

Table 34. PWM1 FREQUENCY REGISTERS

(REG. 0X5F TO 0X61)

In manual fan speed control mode, each PWM output can

be manually updated by writing to Register 0x30 through

Register 0x32 (PWMx current duty cycle registers).

Programming the PWM Current Duty Cycle Registers

The PWM current duty cycle registers are 8-bit registers

that allow the PWM duty cycle for each output to be set

anywhere from 0% to 100% in steps of 0.39%.

Bit

<2:0>

Mnemonic

FREQ

Description

000 = 11.0 Hz

001 = 14.7 Hz

010 = 22.1 Hz

011 = 29.4 Hz

100 = 35.3 Hz (Default)

101 = 44.1 Hz

110 = 58.8 Hz

111 = 88.2 Hz

The value to be programmed into the PWM MIN register is

given by

Value (decimal) = PWM MIN /0.39

Example 1: For a PWM duty cycle of 50%,

Value (decimal) = 50/0.39 = 128 (decimal)

Value = 128 (decimal) or 0x80 (hexadecimal)

Example 2: For a PWM duty cycle of 33%,

Fan Speed Control

The ADT7467 controls fan speed using two modes:

automatic and manual.

In automatic fan speed control mode, fan speed is varied

with temperature without CPU intervention once initial

parameters are set up. The advantage of this is that if the

system hangs, it is guaranteed that the system is protected

from overheating. The automatic fan speed control

incorporates a feature called dynamic T MIN calibration. This

feature reduces the design effort required to program the

automatic fan speed control loop. For information on

Value (decimal) = 33/0.39 = 85 (decimal)

Value = 85 (decimal) or 0x54 (hexadecimal)

PWM Current Duty Cycle Registers

By reading the PWMx current duty cycle registers, the

user can keep track of the current duty cycle on each PWM

output even when the fans are running in automatic fan

speed control mode or acoustic enhancement mode. See the

Automatic Fan Control Overview section for details.

Table 36. P WM CURRENT DUTY CYCL E REGISTERS

Register Description Default

programming the automatic fan speed control loop and the

dynamic T MIN calibration, see the Automatic Fan Control

Overview section.

0x30

0x31

0x32

PWM1 Current Duty Cycle

PWM2 Current Duty Cycle

PWM3 Current Duty Cycle

0x00 (0%)

0x00 (0%)

0x00 (0%)

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