ADT7463ARQZ ON Semiconductor, ADT7463ARQZ Datasheet - Page 42

• Manufacturer Part Number: ADT7463ARQZ
• Description: IC REMOTE THERMAL CTRLR 24-QSOP
• Manufacturer: ON Semiconductor
• Series: dBCool®r

Specifications of ADT7463ARQZ

• Function: Fan Control, Temp Monitor
• Topology: ADC, Comparator, Fan Speed Counter, 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: 24-QSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADT7463
Register Address
0x5F
0x60
0x61
Bit
<2:0>
<3>
<7:4>
*These registers become read-only when the Configuration Register 1 Lock bit is set. Any further attempts to write to these registers shall have no effect.
Name
FREQ
THRM
RANGE
R/W*
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Table XX. TEMP T
Description
Remote 1 T
Local Temp T
Remote 2 T
Description
These bits control the PWMx frequency.
000 = 11.0 Hz
001 = 14.7 Hz
010 = 22.1 Hz
011 = 29.4 Hz
100 = 35.3 Hz (Default)
101 = 44.1 Hz
110 = 58.8 Hz
111 = 88.2 Hz
THRM = 1 causes the THERM pin (Pin 14 or 20) to assert low as an output when this
temperature channel’s THERM limit has been exceeded by 0.25�C. The THERM pin
remains asserted until the temperature is equal to or below the THERM limit. The
minimum time that THERM asserts for is one monitoring cycle. This allows clock modu-
lation of devices that incorporate this feature.
THRM = 0 makes the THERM pin act as an input only, e.g., for Pentium 4 PROCHOT
monitoring, when Pin 14 or 20 is configured as THERM.
These bits determine the PWM duty cycle versus the temperature slope for
automatic fan control.
0000 = 2�C
0001 = 2.5�C
0010 = 3.33�C
0011 = 4�C
0100 = 5�C
0101 = 6.67�C
0110 = 8�C
0111 = 10�C
1000 = 13.33�C
1001 = 16�C
1010 = 20�C
1011 = 26.67�C
1100 = 32�C (Default)
1101 = 40�C
1110 = 53.33�C
1111 = 80�C
Rev. 4 | Page 42 of 52 | www.onsemi.com
RANGE
RANGE
RANGE
RANGE
/PWM 1 Frequency
/PWM 3 Frequency
–42–
/PWM 2 Frequency
/PWM Frequency Registers
Power-On Default
0xC4
0xC4
0xC4
REV. C