ADT7463ARQZ ON Semiconductor, ADT7463ARQZ Datasheet - Page 49

• 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

Bit
<0>
<1>
<2>
<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.
Bit
<7:1>
<0>
Bit
<7:0>
REV. C
Name
ALERT
THERM
Enable
BOOST
FAST
DC1
DC2
DC3
DC4
Name
TMR
ASRT/TMR0 Read-Only
Name
LIMT
Table XXXVIII. Register 0x7A – THERM Limit Register (Power-On Default = 0x00)
Table XXXVII. Register 0x79 – THERM Status Register (Power-On Default = 0x00)
Table XXXVI. Register 0x78 – Configuration Register 3 (Power-On Default = 0x00)
R/W*
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
R/W
Read-Only
R/W
Read/Write
BOOST = 1, assertion of THERM causes all fans to run at 100% duty cycle for
FAST = 1 enables fast TACH measurements on all channels. This increases the
DC1 = 1 enables TACH measurements to be continuously made on TACH1.
DC2 = 2 enables TACH measurements to be continuously made on TACH2.
DC3 = 1 enables TACH measurements to be continuously made on TACH3.
DC4 = 1 enables TACH measurements to be continuously made on TACH4.
Times how long THERM input is asserted. These seven bits read zero until the
Gets set high on the assertion of the THERM input. Cleared on read. If the THERM
Sets maximum THERM assertion length allowed, before an interrupt is generated. This
Description
ALERT = 1, Pin 10 (PWM2/SMBALERT) is configured as an SMBALERT interrupt
output to indicate out-of-limit error conditions.
THERM Enable = 1 enables THERM monitoring functionality on the pin
determined by Bit 1 (TH5V) of Configuration Register 4. When THERM is
asserted, fans can be run at full speed or a timer can be triggered to time how long
THERM has been asserted for.
fail-safe cooling.
TACH measurement rate from once per second, to once every 250 ms (4�).
Description
THERM assertion time exceeds 45.52 ms.
assertion time exceeds 45.52 ms, this bit gets set and becomes the LSB of the 8-bit TMR
reading. This allows THERM assertion times from 45.52 ms to 5.82 s to be reported
back with a resolution of 22.76 ms.
Description
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, then an
interrupt is generated immediately on the assertion of the THERM input.
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ADT7463