Analog Devices ADT7473 Manual page 60

ADT7473
Table 21. Register 0x36—Dynamic T
Bit Name R/W
<0> CYR2 Read/write
<1> V LO Read/write
CCP
<2> PHTR1 Read/write
<3> PHTL Read/write
<4> PHTR2 Read/write
<5> R1T Read/write
<6> LT Read/write
<7> R2T Read/write
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.
Control Register 1 (Power-On Default = 0x00)
MIN
Description
MSB of 3-Bit Remote 2 Cycle Value. The other two bits of the code reside in Dynamic T
(Reg. 0x37). These three bits define the delay time between making subsequent T
control loop, in terms of the 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.
V LO = 1. When the power is supplied from 3.3 V STANDBY and the core voltage (V
CCP
low limit value (Reg. 0x46), the following occurs:
• Status Bit 1 in Status Register 1 is set.
• SMBALERT is generated, if enabled.
• PROCHOT monitoring is disabled.
• Dynamic T control is disabled.
MIN
• The device is prevented from entering shutdown.
• Everything is re-enabled once 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
MIN
dynamically adjusted based on the current temperature, operating point, and high and low limits for this
zone.
R1T = 0 disables dynamic T
MIN
described in the Fan Speed Control section.
LT=1 enables dynamic T control on the local temperature channel. The chosen T
MIN
adjusted based on the current temperature, operating point, and high and low limits for this zone.
LT = 0 disables dynamic T
MIN
described in the Fan Speed Control section.
R2T = 1 enables dynamic T
MIN
dynamically adjusted based on the current temperature, operating point, and high and low limits for this
zone.
R2T = 0 disables dynamic T
MIN
described in the Fan Speed Control section.
increases above the V
CCP
control on the Remote 1 temperature channel. The chosen T
control. The T value chosen is not adjusted, and the channel behaves as
MIN
control. The T value chosen is not adjusted, and the channel behaves as
MIN
control on the Remote 2 temperature channel. The chosen T
control. The T value chosen is not adjusted and the channel behaves as
MIN
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1
MIN
adjustments in the
MIN
CCP
low limit.
CCP
value is dynamically
MIN
Control Register 2
) drops below its V
CCP
value is
MIN
value is
MIN