W83L771W Datasheet, PDF (9/25 Pages) Winbond – H/W Monitoring IC

W83L771W/G
(b) Serial bus read form internal address register followed by the data byte
SCL
0
780
78
SDA
0¹ 10 0 1 1 0⁰ 1⁰ R/W
D7 D6 D5 D4 D3 D2 D1 D0
Start By
Master
Frame 1
Serial Bus Address Byte
aAcckk
aAcck
b^byy
Frame 2
bbyy
7⁷⁷8¹5^WR
Internal Index Register Byte
7⁷8⁷¹5^WR
SCL(Continued)
012345678012345678
SDA(Continued)
10 10 0 1 1 00 01 _R/W
D7 D6 D5 D4 D3 D2 D1 D0
ac^Ak^ck
Frame 3
b₇y_{7b1y W}
785R
Serial Bus Byte
Frame 4
Data Byte
by
784R
Aacc_nkok
b^Ay^ck
Stop by
Master
7_M8^bay5_steR_r
7.3 ^ALERT Output Mode
W83L771W/G ALERT pin is an active-low open-drain output pin which is triggered when measured
temperature exceeds the limitation defined in limit registers. There are three types of ALERT output
mode: ALERT output comparator mode, ALERT output interrupt mode, and ALERT output SMBus
ALERT mode. Each kind of ALERT output mode could best serve the system designer.
7.3.1 ^ALERT Output Comparator Mode
Fig. 7.3.1 shows the mechanism of ALERT output comparator mode. Setting Filter and Alert
Configure Register, or register address BFh, D0 to 1 could enable ALERT output comparator mode.
Under this mode, the ALERT pin will be alerted if the monitored temperature is out-of -limit and the
ALERT pin keeps low until the temperature goes back to the target range. This mode is not power on
default setting.
Publication Release Date: March 31, 2006
-5-
Revision 0.7