EVAL-ADT7463EB ON Semiconductor, EVAL-ADT7463EB Datasheet - Page 43

• Manufacturer Part Number: EVAL-ADT7463EB
• Manufacturer: ON Semiconductor

Specifications of EVAL-ADT7463EB

• Lead Free Status / RoHS Status: Supplier Unconfirmed

Bit
<2:0>
<3>
<4>
<5>
<6>
<7>
*This register becomes read-only when the Configuration Register 1 Lock bit is set to 1. Any further attempts to write to this register will have no effect.
REV. C
Name
ACOU
EN1
SYNC
MIN1
MIN2
MIN3
Table XXI. Register 0x62 – Enhance Acoustics Reg 1 (Power-On Default = 0x00)
R/W*
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Description
These bits select the ramp rate applied to the PWM1 output. Instead of PWM1 jump-
ing 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.
Time Slot Increase
000 = 1
001 = 2
010 = 3
011 = 5
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 ADT7463 is in automatic fan control mode, this bit defines whether PWM 1
is off (0% duty cycle) or at PWM 1 Minimum Duty Cycle when the controlling tem-
perature is below its T
0 = 0% duty cycle below T
1 = PWM 1 Minimum Duty Cycle below T
When the ADT7463 is in automatic fan speed control mode, this bit defines whether
PWM 2 is off (0% duty cycle) or at PWM 2 Minimum Duty Cycle when the controlling
temperature is below its T
0 = 0% duty cycle below T
1 = PWM 2 Minimum Duty Cycle below T
When the ADT7463 is in automatic fan speed control mode, this bit defines whether
PWM 3 is off (0% duty cycle) or at PWM 3 Minimum Duty Cycle when the controlling
temperature is below its T
0 = 0% duty cycle below T
1 = PWM 3 Minimum Duty Cycle below T
–43–
MIN
MIN
MIN
– Hysteresis value.
MIN
MIN
MIN
Time for 33% to 100%
35 s
17.6 s
18 s
7 s
4.4 s
3 s
1.6 s
0.8 s
– Hysteresis value.
– Hysteresis value.
– Hysteresis.
– Hysteresis.
– Hysteresis.
MIN
MIN
MIN
– Hysteresis.
– Hysteresis.
– Hysteresis.
ADT7463