ADT7473ARQZ-1R7 ON Semiconductor, ADT7473ARQZ-1R7 Datasheet - Page 58

• Manufacturer Part Number: ADT7473ARQZ-1R7
• Description: IC THERM MON FAN CTLR 16-QSOP
• Manufacturer: ON Semiconductor
• Series: dBCool®r

Specifications of ADT7473ARQZ-1R7

• Function: Fan Control, Temp Monitor
• Topology: ADC, Comparator, Fan Speed Counter, 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 ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Full Temp Accuracy: +/- 0.5 C
• Digital Output - Bus Interface: Serial (3-Wire, 4-Wire)
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 22. Register 0x36 — Dynamic T
Bit No.
1. This register becomes read−only when the Configuration Register 1 lock bit is set to 1. Any subsequent attempts to write to this register fail.
[0]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
Mnemonic
V
PHTR1
PHTR2
CYR2
PHTL
CCP
R1T
R2T
LT
LO
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
MSB of 3−bit remote 2 cycle value. The other two bits of the code reside in Dynamic T
Control Register 2 (Reg. 0x37). These three bits define the delay time between making
subsequent T
cycles. The system has associated thermal time constants that need to be found to optimize
the response of fans and the control loop.
V
drops below its V
PHTR1 = 1 copies the Remote 1 current temperature to the Remote 1 operating point
register if THERM is asserted. The operating point contains the temperature at which
THERM is asserted, allowing the system to run as quietly as possible without affecting
system performance.
PHTR1 = 0 ignores any THERM assertions on the THERM pin. The Remote 1 operating
point register reflects its programmed value.
PHTL = 1 copies the local channel’s current temperature to the local operating point register
if THERM is asserted. The operating point contains the temperature at which THERM is
asserted. This allows the system to run as quietly as possible without affecting system
performance.
PHTL = 0 ignores any THERM assertions on the THERM pin. The local temperature
operating point register reflects its programmed value.
PHTR2 = 1 copies the Remote 2 current temperature to the Remote 2 operating point
register if THERM is asserted. The operating point contains the temperature at which
THERM is asserted, allowing the system to run as quietly as possible without affecting
system performance.
PHTR2 = 0 ignores any THERM assertions on the THERM pin. The Remote 2 operating
point register reflects its programmed value.
R1T = 1 enables dynamic T
T
high and low limits for this zone.
R1T = 0 disables dynamic T
channel behaves as described in the Fan Speed Control section.
LT=1 enables dynamic T
value is dynamically adjusted based on the current temperature, operating point, and high
and low limits for this zone.
LT = 0 disables dynamic T
channel behaves as described in the Fan Speed Control section.
R2T = 1 enables dynamic T
T
high and low limits for this zone.
R2T = 0 disables dynamic T
channel behaves as described in the Fan Speed Control section.
MIN
MIN
MIN
CCP
Status Bit 1 in Interrupt Status Register 1 is set.
SMBALERT is generated, if enabled.
PROCHOT monitoring is disabled.
Dynamic T
The device is prevented from entering shutdown.
Everything is re−enabled once V
LO = 1. When the power is supplied from 3.3 V STANDBY and the core voltage (V
value is dynamically adjusted based on the current temperature, operating point, and
value is dynamically adjusted based on the current temperature, operating point, and
Control Register 1 (Power−On Default = 0x00)
MIN
MIN
http://onsemi.com
CCP
control is disabled.
adjustments in the control loop, in terms of the number of monitoring
low limit value (Register 0x46), the following occurs:
58
MIN
MIN
MIN
MIN
MIN
MIN
control on the local temperature channel. The chosen T
control. The T
control on the Remote 1 temperature channel. The chosen
control on the Remote 2 temperature channel. The chosen
control. The T
control. The T
CCP
increases above the V
Description
MIN
MIN
MIN
value chosen is not adjusted, and the
value chosen is not adjusted, and the
value chosen is not adjusted and the
(Note 1)
CCP
low limit.
MIN
MIN
CCP
)