ADT7460ARQ ON Semiconductor, ADT7460ARQ Datasheet - Page 49

• Manufacturer Part Number: ADT7460ARQ
• Description: IC REMOTE THRML/FAN CTRLR 16QSOP
• Manufacturer: ON Semiconductor
• Series: dBCool®r

Specifications of ADT7460ARQ

• Rohs Status: RoHS non-compliant
• 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

Table 76. Register 0x79— THERM Status Register (Power-On Default = 0x00)
Bit
<7:1>
<0>
Table 7
Bit
<7:0>
Table 78. Register 0x7B—F
Bit
<1:0>
<3:2>
<5:4>
<7:6>
7. Re
Name
TMR
ASRT/TMR0
Name
LIMT
Name
FAN1
FAN2
FAN3
FAN4
giste 0x7A— THE
r
R/W
Read/Write
R/W
Read/Write
Read/Write
Read/Write
Read/Write
R
Read-On
Read-Only
/W
an
Pulses per Revolution Register (Power-On Default = 0x55)
ly
RM Limit Register (Pow
Descrip
Times how long THERM
exceeds 45.52 ms.
Is set high on the assertion of the THERM input. Cleared on read. If the THERM assertion time exceeds
45.52 ms, this bit is
times from 45.52 ms to 5.82 s to be reported back with a resolution of 22.7
Description
Sets maximum THERM assertion length allowed before an interrupt is generated. This is an 8-bit limit
with a resolution of 22.76 ms allowing THERM assertion limits of 45.52 ms to 5.82 s to be
programmed. If the THERM assertion time exceeds this limit, Bit 5 (F4P) of Interrupt Status Register 2
(Reg. 0x42) is set. If the limit value is 0x00, an interrupt is generated immediately upon the assertion
of the THERM input.
Description
Sets number of pulses to be counted when measuring Fan1 speed. Can be used to determine fan’s
pulses per revolution for unknown fan type.
Pulses Counted
00 = 1
01 = 2 (Default)
10 = 3
11 = 4
Sets number of pulses to be counted when measuring FAN2 speed. Can be used to determine fan’s
pulses per revolution for unknown fan type.
Pulses Counted
00 = 1
01 = 2 (Default)
10 = 3
11 = 4
Sets number of pulses to be counted when measuring FAN3 speed. Can be used to determine fan’s
pulses per revolution for unknown fan type.
Pulses Counted
00 = 1
01 = 2 (Default)
10 = 3
11 = 4
Sets number of pulses to be counted when measuring FAN4 speed. Can be used to determine fan’s
pulses per revolution for unknown fan type.
Pulses Counted
00 = 1
01 = 2 (Default)
10 = 3
11 = 4
tion
set and becomes the LSB of the 8-bit TMR reading. This allows THERM
er-On Default = 0x00)
Rev. C | Page 49 of 52
input is asserted. These seven bits read 0 until the THERM assertion time
6 ms.
ADT7460
assertion