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ADT7463
http://onsemi.com
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2wire Fan Speed Measurements
The ADT7463 is capable of measuring the speed of
2wire fans, i.e., fans without TACH outputs. To do this, the
fan must be interfaced as shown in the Fan Drive Circuitry
section of the data sheet. In this case, the TACH inputs need
to be reprogrammed as analog inputs, AIN.
Table 38. CONFIGURATION REGISTER 2 (REG. 0X73)
Bit
Mnemonic
Description
3
AIN4
1 indicates that Pin 14 is reconfigured to
measure the speed of a 2wire fan
using an external sensing resistor and
coupling capacitor.
2
AIN3
1 indicates that Pin 9 is reconfigured to
measure the speed of a 2wire fan
using an external sensing resistor and
coupling capacitor.
1
AIN2
1 indicates that Pin 12 is reconfigured to
measure the speed of a 2wire fan
using an external sensing resistor and
coupling capacitor.
0
AIN1
1 indicates that Pin 11 is reconfigured to
measure the speed of a 2wire fan
using an external sensing resistor and
coupling capacitor.
AIN Switching Threshold
Having configured the TACH inputs as AIN inputs for
2wire measurements, users can select the sensing threshold
for the AIN signal.
Table 39. CONFIGURATION REGISTER 4 (REG. 0X7D)
Bit
Mnemonic
Description
<3:2>
AINL
These two bits define the input
threshold for 2wire fan speed
measurements.
00 = ?0 mV
01 = ?0 mV
10 = ?0 mV
11 = ?30 mV
Fan Spinup
The ADT7463 has a unique fan spinup function. It spins
the fan at 100% PWM duty cycle until two TACH pulses are
detected on the TACH input. Once two pulses are detected,
the PWM duty cycle goes to the expected running value,
e.g., 33%. The advantage of this is that fans have different
spinup characteristics and takes different times to
overcome inertia. The ADT7463 just runs the fans fast
enough to overcome inertia and are quieter on spinup than
fans programmed to spinup for a given spinup time.
Fan Startup Timeout
To prevent false interrupts being generated as a fan spins
up (since it is below running speed), the ADT7463 includes
a fan startup timeout function. This is the time limit
allowed for two TACH pulses to be detected on spinup. For
example, if 2second fan startup timeout is chosen and no
TACH pulses occur within 2 seconds of the start of spinup,
a fan fault is detected and flagged in the interrupt status
registers.
Table 40. PWM1 TO PWM3 CONFIGURATION
(REG. 0X5C TO 0X5E)
Bit
Mnemonic
Description
<2:0>
SPIN
These bits control the startup
timeout for PWM1, PWM2, PWM3:
000 = No Startup Timeout
001 = 100 ms
010 = 250 ms (Default)
011 = 400 ms
100 = 667 ms
101 = 1 s
110 = 2 s
111 = 4 s
Disabling Fan Startup Timeout
Although fan startup makes fan spinups much quieter
than fixedtime spinups, the option exists to use fixed
spinup times. Bit 5 (FSPDIS) = 1 in Configuration
Register 1 (Reg. 0x40) disables the spinup for two TACH
pulses. Instead, the fan spins up for the fixed time as selected
in Registers 0x5C to 0x5E.
PWM Logic State
The PWM outputs can be programmed high for 100%
duty cycle (non inverted) or low for 100% duty cycle
(inverted).
Table 41. PWM1 TO PWM3 CONFIGURATION
(REG. 0X5C TO 0X5E)
Bit
Mnemonic
Description
<4>
INV
0 = Logic High for 100% PWM
Duty Cycle
1 = Logic Low for 100% PWM
Duty Cycle
PWM Drive Frequency
The PWM drive frequency can be adjusted for the
application. Registers 0x5F to 0x61 configure the PWM
frequency for PWM1 to PWM3, respectively.
Table 42. PWM1 TO PWM3 FREQUENCY REGISTERS
(REG. 0X5F TO 0X61)
Bit
Mnemonic
Description
<2:0>
FREQ
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
Fan Speed Control
The ADT7463 can control fan speed using two different
modes. The first is automatic fan speed control mode. In this
mode, fan speed is automatically varied with temperature
and without CPU intervention, once initial parameters are
set up. The advantage of this is in the case of the system
hanging, the user is guaranteed that the system is protected
from overheating. The automatic fan speed control
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