ADT7460ARQZ ON Semiconductor, ADT7460ARQZ Datasheet - Page 39

• 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

1. 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 effect.
Table 56. Register 0x62 — Enhanced Acoustics Register 1 (Power−On Default = 0x00)
Bit No.
[2:0]
<3>
<4>
<5>
<6>
<7>
Mnemonic
ACOU
SYNC
MIN1
MIN2
MIN3
EN1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Time Slot Increase
These bits select the ramp rate applied to the PWM1 output. Instead of PWM1 jumping
instantaneously to its newly calculated speed, PWM1 ramps gracefully at the rate determined
by these bits. This feature enhances the acoustics of the fan being driven by the PWM1 output.
000 = 1
001 = 2
010 = 3
011 = 4
100 = 8
101 = 12
110 = 24
111 = 48
When this bit is 1, acoustic enhancement is enabled on PWM1 output.
SYNC = 1 synchronizes fan speed measurements on TACH2, TACH3, and TACH4 to PWM3.
This allows up to three fans to be driven from PWM3 output and their speeds to be measured.
SYNC = 0, only TACH3 and TACH4 are synchronized to PWM3 output.
When the ADT7460 is in automatic fan control mode, this bit defines whether PWM1 is off
(0% duty cycle) or at PWM1 minimum duty cycle when the controlling temperature is below its
T
0 = 0% Duty Cycle below T
1 = PWM1 Minimum Duty Cycle below T
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
0 = 0% Duty Cycle below T
1 = PWM2 Minimum Duty Cycle below T
When the ADT7460 is in automatic fan speed control mode, this bit defines whether PWM3 is
off (0% duty cycle) or at PWM3 minimum duty cycle when the controlling temperature is below
its T
0 = 0% Duty Cycle below T
1 = PWM3 Minimum Duty Cycle below T
MIN
MIN
MIN
− Hysteresis value.
− Hysteresis value.
− Hysteresis value.
http://onsemi.com
ADT7460
39
MIN
MIN
MIN
− Hysteresis
− Hysteresis
− Hysteresis
Time for 33% to 100%
35 sec
17.6 sec
11.8 sec
7 sec
4.4 sec
3 sec
1.6 sec
0.8 sec
MIN
MIN
MIN
Description
− Hysteresis
− Hysteresis
− Hysteresis
(Note 1)