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ADT7476
Table 54. FAN TACHOMETER READING REGISTERS (POWER-ON DEFAULT = 0X00) (Note 1)
Register Address
0x28
0x29
0x2A
0x2B
0x2C
0x2D
0x2E
0x2F
R/W
Read-only
Read-only
Read-only
Read-only
Read-only
Read-only
Read-only
Read-only
TACH1 Low Byte
TACH1 High Byte
TACH2 Low Byte
TACH2 High Byte
TACH3 Low Byte
TACH3 High Byte
TACH4 Low Byte
TACH4 High Byte
Description
1. These registers count the number of 11.11 m s periods (based on an internal 90 kHz clock) that occur between a number of consecutive fan TACH
pulses (default = 2). The number of TACH pulses used to count can be changed using the TACH Pulses per Revolution register (Register 0x7B).
This allows the fan speed to be accurately measured. Because a valid fan tachometer reading requires that two bytes be read, the low byte must
be read first. Both the low and high bytes are then frozen until read. At power-on, these registers contain 0x0000 until the first valid fan TACH
measurement is read into these registers. This prevents false interrupts from occurring while the fans are spinning up. A count of 0xFFFF
indicates that a fan is one of the following: stalled or blocked (object jamming the fan), failed (internal circuitry destroyed), or not populated. (The
ADT7476 expects to see a fan connected to each TACH. If a fan is not connected to that TACH, its TACH minimum high and low bytes should
be set to 0xFFFF.) An alternate function, for example, is TACH4 reconfigured as the THERM pin.
Table 55. CURRENT PWM DUTY CYCLE REGISTERS (POWER-ON DEFAULT = 0XFF) (Note 1)
Register Address
0x30
0x31
0x32
R/W
R/W
R/W
R/W
Description
PWM1 Current Duty Cycle (0% to 100% Duty Cycle = 0x00 to 0xFF)
PWM2 Current Duty Cycle (0% to 100% Duty Cycle = 0x00 to 0xFF)
PWM3 Current Duty Cycle (0% to 100% Duty Cycle = 0x00 to 0xFF)
1. These registers reflect the PWM duty cycle driving each fan at any given time. When in automatic fan speed control mode, the ADT7476
reports the PWM duty cycles back through these registers. The PWM duty cycle values vary according to temperature in automatic fan speed
control mode. During fan startup, these registers report back 0x00. In manual mode, the PWM duty cycle outputs can be set to any duty cycle
value by writing to these registers.
Table 56. PWM MAXIMUM DUTY CYCLE (POWER-ON DEFAULT = 0XFF) (Note 1 and 2)
Register Address
0x38
0x39
0x3A
R/W
R/W
R/W
R/W
Description
Maximum Duty Cycle for PWM1 Output, Default = 100% (0xFF)
Maximum Duty Cycle for PWM2 Output, Default = 100% (0xFF)
Maximum Duty Cycle for PWM3 Output, Default = 100% (0xFF)
1. These registers set the maximum PWM duty cycle of the PWM output.
2. This register becomes read-only when the Configuration Register 1 Lock bit is set to 1. Any subsequent attempts to write to this register fail.
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