W83781D Datasheet, PDF (20/53 Pages) Winbond – MONITORING IC

W83781D
PRELIMINARY
7.4 temperature data, continued
Temperature
8-Bit Digital Output
8-Bit Binary
8-Bit Hex
-1øC
1111,1111
FFh
-25øC
1110,0111
E7h
-55øC
1100,1001
C9h
9-Bit Digital Output
9-Bit Binary
9-Bit Hex
1,1111,1110
1FFh
1,1100,1110
1CEh
1,1001,0010
192h
The W83781D temperature interrupt has two mode: (1) The first is Interrupt Mode--exceeding T_OI
causes an interrupt until reset by reading Interrupt Status Register 1 (CR41). Once an interrupt event
has occurred over T_OI, the interrupt will occur again by the temperature going below T_HYST. (2)
Comparator Mode--setting the T_HYST limit to 127øC will cause the comparator mode. When
temperature exceeds T_OI, the interrupt will be generate Interrupt. If the temperature goes below the
T_OI, the interrupt will be reset. Two interrupt modes are shown as below.
T_HYST
127 C
T_OI
T_OI
T_HYST
IRQ
*
*
*
*Interrupt Reset when Interrupt Status Register 1 is read
IRQ
(1) Interrupt Mode
(2) Comparator Mode
The temperature sensor 2 or 3 Over-Temperature (OVT) response is same as temperature sensor 1
IRQ signal.
T_OI
T_HYST
OVT#
(Comparator Mode; default)
OVT#
((Interrupt Mode)
*
*
*
*
*Interrupt Reset when Temperature 2/3 is read
Over-Temperature Response Diagram
- 15 -
Publication Release Date : Nov. 1997
Revision 0.60