ADT7473ARQZ-1RL ON Semiconductor, ADT7473ARQZ-1RL Datasheet - Page 66

• Manufacturer Part Number: ADT7473ARQZ-1RL
• Description: IC REMOTE THERMAL CTLR 16QSOP
• Manufacturer: ON Semiconductor
• Series: dBCool®r

Specifications of ADT7473ARQZ-1RL

• Function: Fan Control, Temp Monitor
• Topology: ADC, Comparator, Fan Speed Counter, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 125°C, External Sensor
• Output Type: SMBus™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Full Temp Accuracy: +/- 0.5 C
• Digital Output - Bus Interface: Serial (3-Wire, 4-Wire)
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 37. Register 0x63 — Enhanced Acoustics Register 2 (Power−On Default = 0x00)
1. This register becomes read−only when the Configuration Register 1 lock bit is set to 1. Any further attempts to write to this register have
Table 38. PWM Minimum Duty Cycle Registers
1. These registers become read−only when the Configuration Register 1 lock bit is set. Any further attempts to write to these registers have
Table 39. Register 0x64, Register 0x65, and Register 0x66 — PWM Minimum Duty Cycle Registers
(Power−On Default = 0x80, 50% Duty Cycle)
Table 40. T
1. These are the T
2. These registers become read−only when the Configuration Register 1 lock bit is set. Any further attempts to write to these registers have
Bit No.
Bit No.
[2:0]
[6:4]
[7:0]
[3]
[7]
Register Address
no effect.
no effect.
minimum speed and increases with temperature according to T
no effect.
Register Address
0x67
0x68
0x69
0x64
0x65
0x66
Mnemonic
Mnemonic
PWM Duty
MIN
ACOU3
ACOU2
Cycle
EN3
EN2
Registers
MIN
registers for each temperature channel. When the temperature measured exceeds T
R/W (Note 1)
(Note 1)
R/W
R/W
R/W
R/W
R/W
R/W
R/W (Note 2)
R/W
R/W
R/W
R/W (Note 1)
R/W
R/W
R/W
Time Slot Increase
Time Slot Increase
000 = 1
001 = 2
010 = 3
011 = 4
100 = 8
101 = 12
110 = 24
111 = 48
000 = 1
001 = 2
010 = 3
011 = 4
100 = 8
101 = 12
110 = 24
111 = 48
These bits select the ramp rate applied to the PWM3 output. Instead of PWM3 jumping
instantly to its newly calculated speed, PWM3 ramps gradually at the rate determined by
these bits. This effect enhances the acoustics of the fan being driven by the PWM3 output.
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
instantly to its newly calculated speed, PWM2 ramps gradually at the rate determined by
these bits. This effect enhances the acoustics of the fans being driven by the PWM2 output.
When this bit is 1, acoustic enhancement is enabled on PWM2 output.
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
PWM1 minimum duty cycle.
PWM2 minimum duty cycle.
PWM3 minimum duty cycle.
http://onsemi.com
RANGE
66
Time for 33% to 100%
Time for 33% to 100%
35 sec
17.6 sec
11.8 sec
7.0 sec
4.4 sec
3.0 sec
1.6 sec
0.8 sec
35 sec
17.6 sec
11.8 sec
7.0 sec
4.4 sec
3.0 sec
1.6 sec
0.8 sec
MIN
Description
.
MIN
duty cycle for PWMx.
Description
.
MIN
MIN
.
.
Description
Description
MIN
, the appropriate fan runs at
0x80 (50% duty cycle)
0x80 (50% duty cycle)
0x80 (50% duty cycle)
Power−On Default
Power−On Default
0x9A (90°C)
0x9A (90°C)
0x9A (90°C)