ADT7463ARQZ-R7 datasheet(36/52 Pages) ONSEMI

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REV. C

–36–

ADT7463

Table X. Register 0x36 – Dynamic TMIN Control Register 1 (Power-On Default = 0x00)

Bit

Name

R/W

Description

<0>

CYR2

Read/Write

MSB of 3-Bit Remote 2 Cycle Value. The other two bits of the code reside in Dynamic TMIN

Control Register 2 (Reg. 0x37). These three bits define the delay time between making sub-

sequent TMIN 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>

VCCPLO

Read/Write

VCCPLO = 1. When the power is supplied from 3.3 V STANDBY and the core voltage

(VCCP) drops below its VCCP 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 TMIN control is disabled.

•The device is prevented from entering shutdown.

•Everything re-enabled once VCCP increases above VCCP low limit.

<2>

PHTR1

Read/Write

PHTR1 = 1 copies the Remote 1 current temperature to the Remote 1 Operating Point

which THERM is asserted. This allows the system to run as quietly as possible without

system performance being affected. PHTR1 = 0 ignores any THERM assertions on the

THERM pin. The Remote 1 Operating Point Register reflects its programmed value.

<3>

PHTL

Read/Write

PHTL = 1 copies the local channel’s current temperature to the Local Operating Point

which THERM is asserted. This allows the system to run as quietly as possible without

system performance being affected. PHTL = 0 ignores any THERM assertions on the

THERM pin. The Local Temp Operating Point Register reflects its programmed value.

<4>

PHTR2

Read/Write

PHTR2 = 1 copies the Remote 2 current temperature to the Remote 2 Operating Point

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

Read/Write

R1T = 1 enables dynamic TMIN control on the Remote 1 Temperature channel. The

chosen TMIN value is dynamically adjusted based on the current temperature, oper-

ating point, and high and low limits for this zone. R1T = 0 disables dynamic TMIN con-

trol. The TMIN value chosen is not adjusted and the channel behaves as described

in the Automatic Fan Control section.

<6>

Read/Write

LT = 1 enables dynamic TMIN control on the Local Temperature channel. The chosen

TMIN value is dynamically adjusted based on the current temperature, operating

point, and high and low limits for this zone. LT = 0 disables dynamic TMIN control. The

TMIN value chosen is not adjusted and the channel behaves as described in the

Automatic Fan Control section.

<7>

R2T

Read/Write

R2T = 1 enables dynamic TMIN control on the Remote 2 Temperature channel. The

chosen TMIN value is dynamically adjusted based on the current temperature,

operating point, and high and low limits for this zone. R2T = 0 disables dynamic TMIN

control. The TMIN value chosen is not adjusted and the channel behaves as

described in the Automatic Fan Control section.

*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.

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