ADT7475ARQZ ON Semiconductor, ADT7475ARQZ Datasheet - Page 39

• Manufacturer Part Number: ADT7475ARQZ
• Description: IC REMOTE THERMAL CTRLR 16-QSOP
• Manufacturer: ON Semiconductor
• Series: dBCool®r

Specifications of ADT7475ARQZ

• 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

Enhanced Acoustics Register 1 (0x62)
Bit 7 (MIN3) = 0, PWM3 is off (0% PWM duty cycle) when
temperature is below T
Bit 7 (MIN3) = 1, PWM3 runs at PWM3 minimum duty
cycle below T
Bit 6 (MIN2) = 0, PWM2 is off (0% PWM duty cycle) when
temperature is below T
Bit 6 (MIN2) = 1, PWM2 runs at PWM2 minimum duty
cycle below T
Bit 5 (MIN1) = 0, PWM1 is off (0% PWM duty cycle) when
temperature is below T
Bit 5 (MIN1) = 1, PWM1 runs at PWM1 minimum duty
cycle below T
AMBIENT TEMP
REMOTE 2 =
REMOTE 1 =
MIN
MIN
MIN
VRM TEMP
CPU TEMP
LOCAL =
Figure 60. The T
100%
− T
− T
− T
0%
HYST
HYST
HYST
MIN
MIN
MIN
THERMAL CALIBRATION
THERMAL CALIBRATION
THERMAL CALIBRATION
.
.
.
T
− T
− T
− T
T
T
T
MIN
MIN
MIN
MIN
HYST
HYST
HYST
HYST
.
.
.
T
RANGE
T
T
T
Value Applies to Fan On/Off Hysteresis and THERM Hysteresis
RANGE
RANGE
RANGE
T
100%
100%
100%
THERM
0%
0%
0%
MUX
http://onsemi.com
39
PWM
PWM
PWM
MIN
MIN
MIN
Configuration Register 6 (0x10)
Bit 0 (SLOW Remote 1), 1 slows the ramp rate for PWM
changes associated with the Remote 1 temperature channel
by 4.
Bit 1 (SLOW Local), 1 slows the ramp rate for PWM
changes associated with the Local temperature channel by 4.
Bit 2 (SLOW Remote 2), 1 slows the ramp rate for PWM
changes associated with the Remote 2 temperature channel
by 4.
Bit 7 (ExtraSlow), 1 slows the ramp rate for all fans by a
factor of 39.2%.
SLOW bit is set for each temperature monitoring channel.
The following sections list the ramp−up times when the
CONFIG
CONFIG
CONFIG
TACHOMETER 1
MEASUREMENT
TACHOMETER 2
MEASUREMENT
TACHOMETER 3
MEASUREMENT
PWM
PWM
PWM
GENERATOR
GENERATOR
GENERATOR
AND 4
PWM
PWM
PWM
ENHANCEMENT)
ENHANCEMENT)
ENHANCEMENT)
(ACOUSTIC
(ACOUSTIC
(ACOUSTIC
CONTROL
CONTROL
CONTROL
RAMP
RAMP
RAMP
PWM1
TACH1
PWM2
TACH2
PWM3
TACH3
FRONT CHASSIS
REAR CHASSIS
CPU FAN SINK