ADT7463
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37
Table 50. OPERATING POINT REGISTERS (POWERON DEFAULT = 0X64) (Note 1)
Register Address
R/W
Description
0x33
R/W
Remote 1 Operating Point Register (Default = 100癈)
0x34
R/W
Local Temp Operating Point Register (Default = 100癈)
0x35
R/W
Remote 2 Operating Point Register (Default = 100癈)
1.  These registers become readonly when the Configuration Register 1 lock bit is set to 1. Any subsequent attempts to write to these registers
will fail. These registers set the target operating point for each temperature channel when the dynamic T
MIN
 control feature is enabled. The
fans being controlled are adjusted to maintain temperature about an operating point.
Table 51. REGISTER 0X36  DYNAMIC T
MIN
 CONTROL REGISTER 1 (POWERON DEFAULT = 0X00) (Note 1)
Bit
Name
R/W
Description
<0>
CYR2
R/W
MSB of 3bit Remote 2 Cycle Value. The other two bits of the code reside in Dynamic T
MIN
Control Register 2 (Reg. 0x37). These three bits define the delay time between making
subsequent T
MIN
 adjustments in the control loop, in terms of number of monitoring cycles. The
system has associated thermal time constants that need to be found to optimize the response
of fans and the control loop.
<1>
V
CCP
LO
R/W
V
CCP
LO = 1. When the power is supplied from 3.3 V STANDBY and the core voltage (V
CCP
)
drops below its V
CCP
 low limit value (Reg. 0x46), the following occurs:
" Status Bit 1 in Status Register 1 gets set
" SMBALERT
 gets generated if enabled
" PROCHOT
 monitoring is disabled
" Dynamic T
MIN
 control is disabled
" The device is prevented from entering shutdown
" Everything reenabled once V
CCP
 increases above V
CCP
 low limit
<2>
PHTR1
R/W
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. This allows 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
Tegister reflects its programmed value.
<3>
PHTL
R/W
PHTL = 1 copies the local channels 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.
<4>
PHTR2
R/W
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. This allows the system to run as quietly as possible without system performance
being affected.
PHTR2 = 0 ignores any THERM
 assertions on the THERM
 pin. The Remote 2 Operating Point
Register reflects its programmed value.
<5>
R1T
R/W
R1T = 1 enables dynamic T
MIN
 control on the Remote 1 Temperature channel. The chosen
T
MIN
 value is dynamically adjusted based on the current temperature, operating point, and high
and low limits for this zone.
R1T = 0 disables dynamic T
MIN
 control. The T
MIN
 value chosen is not adjusted, and the
channel behaves as described in the Automatic Fan Control section.
<6>
LT
R/W
LT = 1 enables dynamic T
MIN
 control on the Local Temperature channel. The chosen T
MIN
value is dynamically adjusted based on the current temperature, operating point, and high and
low limits for this zone.
LT = 0 disables dynamic T
MIN
 control. The T
MIN
 value chosen is not adjusted, and the channel
behaves as described in the Automatic Fan Control section.
<7>
R2T
R/W
R2T = 1 enables dynamic T
MIN
 control on the Remote 2 Temperature channel. The chosen
T
MIN
 value is dynamically adjusted based on the current temperature, operating point, and high
and low limits for this zone.
R2T = 0 disables dynamic T
MIN
 control. The T
MIN
 value chosen is not adjusted, and the
channel behaves as described in the Automatic Fan Control section.
1.  This register becomes readonly when the Configuration Register 1 Lock bit is set to 1. Further attempts to write to this register have no effect.
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