ADT7460ARQZ ON Semiconductor, ADT7460ARQZ Datasheet - Page 40

• 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.
1. These registers become read−only when the ADT7460 is in automatic fan control mode.
1. These registers become read−only when the Configuration Register 1 lock bit is set. Further attempts to write to these registers have no
2. These are the T
Table 57. Register 0x63 — Enhanced Acoustics Register 2 (Power−On Default = 0x00)
Table 58. PWM Min Duty Cycle Registers
Table 59. PWM Min Duty Cycle Register Bits
Table 60. T
Bit No.
Bit No.
<6:4>
<7:0>
[2:0]
<3>
<7>
Register Address
Register Address
effect.
minimum speed and increase with temperature according to T
0x64
0x65
0x66
0x67
0x68
0x69
Mnemonic
Mnemonic
PWM Duty
ACOU3
ACOU2
MIN
Cycle
EN3
EN2
Registers
MIN
registers for each temperature channel. When the temperature measured exceeds T
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
(Note 1)
Time Slot Increase
Time Slot Increase
These bits select the ramp rate applied to the PWM3 output. Instead of PWM3 jumping
instantaneously to its newly calculated speed, PWM3 ramps gracefully at the rate determined
by these bits. This effect enhances the acoustics of the fan being driven by the PWM3 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 PWM3 output.
These bits select the ramp rate applied to the PWM2 output. Instead of PWM2 jumping
instantaneously to its newly calculated speed, PWM2 ramps gracefully at the rate determined
by these bits. This effect enhances the acoustics of the fans being driven by the PWM2 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 PWM2 output.
PWM1 Min Duty Cycle
PWM2 Min Duty Cycle
PWM3 Min Duty Cycle
These bits define the PWM
0x00 = 0% Duty Cycle (Fan Off)
0x40 = 25% Duty Cycle
0x80 = 50% Duty Cycle
0xFF = 100% Duty Cycle (Fan Full Speed)
Remote 1 Temperature T
Local Temperature T
Remote 2 Temperature T
(Note 1)
http://onsemi.com
MIN
Description (Note 2)
ADT7460
RANGE
MIN
MIN
Description
40
MIN
.
duty cycle for PWMx.
Time for 33% to 100%
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
35 sec
17.6 sec
11.8 sec
7 sec
4.4 sec
3 sec
1.6 sec
0.8 sec
Description
Description
(Note 1)
MIN
, the appropriate fan runs at
0x80 (50% duty cycle)
0x80 (50% duty cycle)
0x80 (50% duty cycle)
Power−On Default
Power−On Default
0x5A (90°C)
0x5A (90°C)
0x5A (90°C)