ADT7462ACPZ-REEL7 ON Semiconductor, ADT7462ACPZ-REEL7 Datasheet - Page 34

• Manufacturer Part Number: ADT7462ACPZ-REEL7
• Description: IC TEMP/VOLT MONITOR 32-LFCSP
• Manufacturer: ON Semiconductor

Specifications of ADT7462ACPZ-REEL7

• Function: Fan Control, Temp Monitor
• Topology: ADC, Comparator, 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 ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 32-LFCSP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TACH rising edges are counted. See the Fan Spin−Up
section for more details. In some cases, primarily for
psycho−acoustic reasons, the fan should never switch off
below T
Register 0x26 should be set to keep the fans running at the
PWM minimum duty cycle, if the temperature falls below
T
T
Register 0x5C, Local Temperature T
Register 0x5D, Remote 1 Temperature T
Register 0x5E, Remote 2 Temperature T
Register 0x5F, Remote 3 Temperature T
PWM1 and PWM2 Frequency Register (0x25)
Bit 0 (MIN 1) = 0. PWM1 is off (0% PWM duty cycle) when
temperature is below T
MIN
MIN
To overcome fan inertia, the fan is spun up until two valid
Registers
.
MIN
AMBIENT TEMP
. The corresponding bits in Register 0x25 and
REMOTE 1 =
REMOTE 2 =
VRM TEMP
CPU TEMP
LOCAL =
MIN
THERMAL CALIBRATION
THERMAL CALIBRATION
THERMAL CALIBRATION
T
T
T
− T
MIN
MIN
MIN
Figure 52. Assigning Temperature Channels to Fan Channels
HYST
MIN
.
T
T
T
MIN
MIN
MIN
RANGE
RANGE
RANGE
= 0x9A (90°C)
100%
100%
100%
= 0x9A (90°C)
= 0x9A (90°C)
= 0x9A (90°C)
0%
0%
0%
MUX
http://onsemi.com
MUX
34
Bit 0 (MIN 1) = 1. PWM1 runs at PWM1 minimum duty
cycle below T
Bit 1 (MIN 2) = 0. PWM2 is off (0% PWM duty cycle) when
temperature is below T
Bit 1 (MIN 2) = 1. PWM2 runs at PWM2 minimum duty
cycle below T
PWM3 and PWM4 Frequency Register (0x26)
Bit 0 (MIN 3) = 0. PWM3 is off (0% PWM duty cycle) when
temperature is below T
Bit 0 (MIN 3) = 1. PWM3 runs at PWM3 minimum duty
cycle below T
Bit 1 (MIN 4) = 0. PWM4 is off (0% PWM duty cycle) when
temperature is below T
Bit 1 (MIN 4) = 1. PWM4 runs at PWM4 minimum duty
cycle below T
PWM
PWM
PWM
MIN
MIN
MIN
ENHANCEMENT)
ENHANCEMENT)
ENHANCEMENT)
TACHOMETER 1
MEASUREMENT
TACHOMETER 2
MEASUREMENT
TACHOMETER 3
MEASUREMENT
(ACOUSTIC
(ACOUSTIC
(ACOUSTIC
CONTROL
CONTROL
CONTROL
RAMP
RAMP
RAMP
AND 4
MIN
MIN
MIN
MIN
− T
− T
− T
− T
GENERATOR
GENERATOR
GENERATOR
HYST
HYST
HYST
HYST
MIN
MIN
MIN
CONFIG
CONFIG
CONFIG
PWM
PWM
PWM
PWM
PWM
PWM
.
.
.
.
− T
− T
− T
HYST
HYST
HYST
.
.
.
PWM1
TACH1
PWM2
TACH2
PWM3
TACH3
FRONT CHASSIS
REAR CHASSIS
CPU FAN SINK