DS75 DALLAS [Dallas Semiconductor], DS75 Datasheet - Page 4

• Manufacturer Part Number: DS75
• Description: 2.Wire Thermal Watchdog
• Manufacturer: DALLAS [Dallas Semiconductor]

Temperature/Data Relationships Table 2
MSb
TEMPERATURE/DATA RELATIONSHIPS
Table 2 cont’d
OPERATION–Thermostat Control
In its comparator operating mode, the DS75 functions as a thermostat with programmable hysteresis, as
shown in Figure 2. When the DS75’s temperature meets or exceeds the value stored in the high tempera-
ture trip register (T
becomes active, and will stay active until the temperature falls below the temperature stored in the low
temperature trigger register (T
The DS75 powers up in the comparator mode with T
used as a standalone thermostat (no 2–wire interface required) with those setpoints.
In the interrupt mode, the O.S. output will first become active following the programmed number of
consecutive conversions above T
shutdown mode or by reading any register (temperature, configuration, T
Following a clear, a subsequent fault can only occur if consecutive conversions fall below T
interrupt/clear process is thus cyclical (T
first of multiple consecutive T
function. The same situation applies to multiple consecutive T
+25.0625 C
–25.0625 C
+10.125 C
–10.125 C
2
+125 C
+0 C
–55 C
S
TEMP
+0.5 C
–0.5 C
–1
2
2
–2
6
0111 1101 0000 0000
0001 1001 0001 0000
0000 1010 0010 0000
0000 0000 1000 0000
0000 0000 0000 0000
1111 1111 1000 0000
1111 0101 1110 0000
1110 0110 1111 0000
1100 1001 0000 0000
DIGITAL OUTPUT
OS
2
2
–3
5
) a consecutive number of times defined by the configuration register, the output
(Binary)
(UNIT = C)
2
2
HYST
OS
–4
4
violations will activate O.S., even if each fault is separated by a clearing
OS
) the first time. In this way, any amount of hysteresis may be obtained.
. The fault can only be cleared by either setting the DS75 in a
2
0
3
OS
, clear, T
DIGITAL
OUTPUT
7D00h
0A20h
E5E0h
E6F0h
C900h
FF80h
1910h
0080h
0000h
(Hex)
2
0
4 of 13
2
HYST
OS
=80 C and T
2
, clear, T
0
1
HYST
LSb
2
0
events.
OS
0
, clear, T
HYST
MSB
LSB
=75 C, and the device can be
OS
, or T
HYST
, clear, . . .). Only the
HYST
) on the device.
HYST
. This
DS75