PC8374L datasheet(164/239 Pages) NSC

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8.0 Health Management (HM) (Continued)

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164

Revision1.1

8.5.23 Status Register 1

Event status register 1. This register is accessible only through SMBus.

Note: All status bits in this register are reset when START bit of the Configuration register is reset.

Location: 41h

Type:

R/W

START. When this bit is reset to 0, monitoring and FANPWM output control functions based on the limit

and parameter registers are disabled, and all status bits in Status Registers 1,2 and 3 are cleared. In this

case, all registers not locked by LOCK can be modiﬁed, but they do not affect the Health monitor and

control functions of the HM. START bit is always writable regardless of LOCK bit.

When this bit is set to 1, Monitoring and FANPWM output control functions based on limit and parameter

registers are enabled.

START bit is reset to 0 by a VSB Power-Up reset. Then, HM performs the following:

• After READY bit becomes 1, Temperature Zone1 is monitored (although START bit is 0). If a temper-

ature above +110

°C is detected, ETC is asserted (see Section 8.2.10 on page 139), which turns the

Main power supply off.

• The FANPWM outputs are at 0% duty cycle; they are set to a different value after either of the follow-

ing occurs:

— Two seconds elapsed since the VDD3 power has been turned on (FANPWM outputs are set to the

value contained in the associated FANPWMn MAX Duty registers)

— START bit is set to 1

Bit

76543210

Name

STAT_REG2

_ERR

ZONE3_ERR ZONE2_ERR ZONE1_ERR

5V_ERR

3.3V_ERR

Vccp_ERR

2.5V_ERR

Reset

00000000

Bit

Description

STAT_REG2_ERR. Is set to 1 if one of the bits in Status Register 2 is set. Once set, the bit is cleared only

after the Status Register 2 is read and then, the Status Register 1 is read.

0: No event is set in Interrupt Status Register 2 (default)

1: At least one of the event bits in Status Register 2 is set

ZONE3_ERR. Is set to 1 when Zone3 temperature is less than the limit set in the corresponding Low Temp

0: Temperature does not exceed any respective (default)

1: Temperature exceeds a respective limit

ZONE2_ERR. Is set to 1 when Zone2 temperature is less than the limit set in the corresponding Low Temp

0: Temperature does not exceed any respective limit (default)

1: Temperature exceeds a respective limit

ZONE1_ERR. Is set to 1 when Zone1 temperature is less than the limit set in the corresponding Low Temp

0: Temperature does not exceed any respective limit (default)

1: Temperature exceeds a respective limit

Bit

Type

Description

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