W83627DHG Datasheet, PDF (67/268 Pages) Winbond – WINBOND LPC I/O

W83627DHG
7.7.4 BEEP Alarm Function
The W83627DHG provides an alarm output function at the BEEP/SO pin. The BEEP/SO pin is a
multi-function pin and can be configured as BEEP output, if Configuration Register CR[24h], bit 1 is set
to zero.
The BEEP outputs a warning tone when one of the monitored parameters in the following events is out
of the preset range.
z Any voltage input of the nine pins (CPUVCORE, VIN[0..3], 3VCC, AVCC , 3VSB and VBAT) is out
of the allowed range;
z Any temperature input of the three pins (SYSTIN, CPUTIN and AUXTIN) exceeds the limit;
z Any fan input of the five pins (SYSFANIN, CPUFANIN0, AUXFANIN0, CPUFANIN1 and
AUXFANIN1) exceeds the limit;
z CASEOPEN# input pin is sampled low;
z User-defined bit (Bank 4, Index 53h, bit 5) is written to 1.
Whether the BEEP alarm function is enabled or disabled is determined by the control bit at Hardware
Monitor Device, Bank 0, Index 57h, bit 7. Also, each event has their individual enable bit at Hardware
Monitor Device, Bank 0, Index 56h bit[7:0], Index 57h bit[6:0] and Bank 4, Index 53h, bit[1:0].
BEEP/SO is an open-drain output pin and its default state is low. When the BEEP alarm function is
activated, this pin repeatedly outputs 600 Hz square wave for 0.5 second and 1.2 KHz square wave for
0.5 second in turn until the enable bit or the abnormal event is cleared.
Publication Release Date: Aug, 22, 2007
-55-
Version 1.4