PC8374L datasheet(167/239 Pages) NSC

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8.0 Health Management (HM) (Continued)

Revision 1.1

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8.5.26 Status Register 4

Location: 74h

Type:

8.5.27 Voltage Low Limit 2.5V

Voltage low limit for 2.5V voltage monitoring.

Location: 44h

Type:

R/W or RO (Becomes read-only when LOCK_LIM bit in the Monitoring Control register is set.)

CRIT1_ERR. Is set to 1 when Zone1 temperature is more than the limit set in the corresponding

Temperature Critical Limit register (see Section 8.5.51 on page 175). Once set, the bit is updated again only

after this register is read.

0: Temperature does not exceed the critical limit (default)

1: Temperature exceeds the critical limit

Bit

76543210

Name

Reserved

FAN4_OFF

FAN3_OFF

FAN2_OFF

FAN1_OFF

Reset

00001111

Bit

Description

7-4

Reserved.

FAN4_OFF. When set, this bit indicates for Fan Tachometer 4 that the associated FANPWM signal (see

Section 8.5.62 on page 181) driving the fan is in one of the following states:

• Fan turned off: The Duty Cycle of the associated FANPWM output is 0%

• Fan spinning-up: The rotational speed of the fan driven by the associated FANPWM output is increasing

from 0

• Fan stopping: The rotational speed of the fan driven by the associated FANPWM output is decreasing to 0

When FAN4_OFF bit is set, Fan Tachometer 4 registers are set to FFFFh, and the following bits are set to 0:

FAN4_STALL status bit of Status Register 2 (see Section 8.5.24 on page 165), and FAN4_STS of HM Sensor

Status Register 2 (see Section 8.4.9 on page 148).

When FAN4_OFF bit returns to 0, the status bits and Fan Tachometer registers are released (can be updated).

0: Fan rotating

1: Fan off, spinning-up or stopping (default)

2-0

FAN3_OFF - FAN1_OFF. Same as FAN4_OFF for Fan Tachometer 3-1.

Bit

76543210

Name

LOW_LIMIT

Reset

00000000

Bit

Description

7-0

LOW_LIMIT. The low limit value to which the associated voltage input data is compared. If the voltage input data

is lower than LOW_LIMIT, the corresponding bits in the HM Interrupt Status register, HM Sensor Status Register

and Status Register are updated/set (see Section 8.4.4 on page 143, Section 8.4.8 on page 147, and

Section 8.5.23 on page 164).

Bit

Description

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PC8374L Datasheet(PDF) 167 Page - National Semiconductor (TI)

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