ADT7460ARQZ ON Semiconductor, ADT7460ARQZ Datasheet - Page 43

• Manufacturer Part Number: ADT7460ARQZ
• Description: IC REMOTE THRML/FAN CTRLR 16QSOP
• Manufacturer: ON Semiconductor
• Series: dBCool®r

Specifications of ADT7460ARQZ

• Function: Fan Control, Temp Monitor
• Topology: ADC, Comparator, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 120°C, External Sensor
• Output Type: SMBus™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 120°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Full Temp Accuracy: +/- 3 C
• Digital Output - Bus Interface: Serial (3-Wire)
• Maximum Operating Temperature: + 120 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 59. Register 0x62—Enhance Acoustics Register 1 (Power-On Default = 0x00)
Bit
<2:0>
<3>
<4>
<5>
<6>
<7>
This register becomes read-only when the Configuration Register 1 lock bit is set to 1. Further attempts to write to this register have no
e
ffect.
Name
ACOU
EN1
SYNC
MIN1
MIN2
MIN3
R
R
R
R
Read/Write
Read/Write
Read
ead/Write
ead/Write
ead/Write
/W
/Write
D
T
i
e
T
000
001
010
011
100
101
110
111
W
S
t
S
W
or at PWM1 minimum duty cycle when the controlling temperature is below its T
0
1
When the ADT7460 is in automatic fan speed control mode, this bit defines whether PWM2 is off (0% duty
cycle) or at PWM2 minimum duty cycle when the controlling temperature is below its T
value.
0
1
When the ADT7
c
value.
0
1
ts newly calculated speed, PWM1 ramps gracefully at the rate determined by these bits. This feature
hree fans to be driven from PWM3 output and their speeds to be measured.
hese bits select the ramp rate applied to the PWM1 output. Instead of PWM1 jumping instantaneously to
nhances the acoustics of the fan being driven by the PWM1 output.
YNC = 1 synchronizes fan speed measurements on TACH2, TACH3, and TACH4 to PWM3. This allows up to
YNC = 0, only TACH3 and TACH4 are synchronized to PWM3 output.
ycle) or at PWM3 minimum duty cycle when the controlling temperatur
ime Slot Increase
escription
hen this bit is 1, acoustic enhancement is enabled on PWM1 output.
hen the ADT7460 is
=
=
=
=
=
=
=
=
=
=
=
=
=
=
0 Du
P M1
0% Duty Cycle below T
PWM2 Minimu
0% Duty Cycle below T
PWM3 Minimum Duty Cycle below T
%
W
1
2
3
5
8
12
24
48
ty Cycle below T
Minimum Duty Cycle below T
460 is in automatic fan speed control mode, this bit defines whet
in automatic
m Duty Cycle below T
Rev. C | Page 43 of 52
MIN
MIN
MIN
T
35 s
17.6 s
18 s
7 s
4.4 s
3 s
1.6 s
0.8 s
− Hysteresis
− Hysteresis
− Hysteresis
fan control mode, this bit
ime for 33% to 100%
MIN
MIN
MIN
− Hysteresis
− Hysteresis
− Hysteresis
defines whether PWM1 is off (0% duty cycle)
e is below its T
her PWM3 is off (0% duty
MIN
− Hysteresis value.
MIN
MIN
− Hysteresis
− Hysteresis
ADT7460