PC8374L datasheet(176/239 Pages) NSC

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8.0 Health Management (HM) (Continued)

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176

Revision1.1

8.5.54 Monitoring Control

Location: 75h

Type:

R/W or RO (Becomes read-only when LOCK bit in the Configuration register is set.)

Bit

76543210

Name

LOCK_LIM VOLT_HYST TEMP_HYST

Reserved

TEMP_FILT

ZONE3_

RANGE

ZONE2_

RANGE

ZONE1_

RANGE

Reset

Bit

Description

LOCK_LIM. When set to 1, locks itself and the following HM Limit registers: Voltage Low Limit (2.5V, Vccp, 3.3V,

5V, 12V), Voltage High Limit (2.5V, Vccp, 3.3V, 5V, 12V), Temperature Low Limit Zone1-3, Temperature High

Limit Zone1-3, Fan Tachometer1-4 Low Limit LSB, Fan Tachometer1-4 Low Limit MSB, Temperature Critical Limit

Zone1-3.

This bit is reset by Hardware reset.

0: All R/W HM Limit registers are enabled for write (default)

1: Specified HM Limit registers are RO

VOLT_HYST (Voltage Channels, Hysteresis). Selects whether hysteresis is used when the voltage data in

Voltage Reading registers is compared with the Voltage Low Limit and Voltage High Limit registers.

0: No hysteresis (default)

1: The hysteresis is equal to the LSBit multiplied by 4 of the (High or Low) Voltage Limit register

TEMP_HYST (Temperature Channels, Hysteresis). Selects whether hysteresis is used when the temperature

data in Temperature Reading registers is compared with the Temperature Low Limit, Temperature High Limit and

Temperature Critical Limit registers. Temperature hysteresis value is independent on the setting of the

ZONE1_RANGE bit (bit 0, below).

0: No hysteresis (default)

1: Hysteresis of 4

°C

Reserved.

TEMP_FILT (Temperature Data Filter). Selects whether a low-pass ﬁlter is applied to the temperature data read

from the LMxx Sensor device. If this bit is 1, the temperature data is filtered before it is stored in the

Temperature Reading Zone ‘n’ register.

0: No ﬁlter (default)

1: A low-pass filter with 673 ms rise time (0% to 95% of the incoming temperature change) is applied to the tem-

perature channels

ZONE3_RANGE. Conﬁgures the temperature range shown in the Temperature Reading Zone3 register. The

LSBit of the LMxx temperature MSByte represents a value of 2

°C. When ZONE3_RANGE is 0, the LMxx

temperature data is truncated to -127

°C<=value<=127°C, with the LSB of the Temperature Reading register

representing a value of 1

°C. When ZONE3_RANGE is 1, the LMxx MSByte is translated to the Temperature

Reading registers and represents a value such that -255

°C<=value<=255°C, with the LSBit having a value of

°C (see Figure 37 on page 158).

Note: This bit is not relevant when an LM95010 device is used.

0: 1

°C resolution for Temperature Reading register (default)

1: 2

°C resolution for Temperature Reading register

ZONE2_RANGE. Same as ZONE3_RANGE, but for Zone2. This bit is always relevant (i.e., it is not dependent

on the LMxx device used).

ZONE1_RANGE. Same as ZONE3_RANGE, but for Zone1. This bit is always relevant (i.e., it is not dependent

on the LMxx device used).

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PC8374L Datasheet(PDF) 176 Page - National Semiconductor (TI)

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