ADT7467ARQZ-R7 datasheet(63/77 Pages) ONSEMI

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ADT7467

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Table 23. Register 0x36—Dynamic TMIN Control Register 1 (Power-On Default = 0x00)1

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

(0x37). These three bits define the delay time, in terms of the number of monitoring cycles, for making

subsequent TMIN adjustments in the control loop. The system is associated with thermal time constants that

must be found to optimize the response of the 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 (Register 0x46), the following occurs:

Status Bit 1 in Interrupt Status Register 1 is set.

SMBALERT is generated if enabled.

PROCHOT monitoring is disabled.

Dynamic TMIN control is disabled.

The device is prevented from entering shutdown.

Everything is re-enabled once VCCP increases above the VCCPLO limit.

<2>

PHTR1

Read/write

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 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 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 THERM assertions on the THERM pin. The local temperature 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 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 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, operating point, and high and low limits for the zone.

R1T = 0 disables dynamic TMIN control. The TMIN value chosen is not adjusted, and the channel behaves as

described in the Fan Speed 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 the zone.

LT = 0 disables dynamic TMIN control. The TMIN value chosen is not adjusted, and the channel behaves as

described in the Fan Speed 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 the zone.

R2T = 0 disables dynamic TMIN control. The TMIN value chosen is not adjusted, and the channel behaves as

described in the Fan Speed Control section.

1 This register becomes a read-only register when the Configuration Register 1 LOCK bit is set to 1. Any subsequent attempts to write to this register fail.

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