DS1780 Datasheet, PDF (20/28 Pages) Dallas Semiconductor – CPU Peripheral Monitor

DS1780
TEMPERATURE CONFIGURATION REGISTER (ADDRESS Ox4B; POWER-UP
DEFAULT = 01h) Table 10.12
BIT NAME R/W
DESCRIPTION
If Bits 0 and Bits 1 of this register are both 0 or both 1, this selects the default interrupt
mode which gives the user an interrupt if the temperature goes above the hot limit. The
interrupt will be cleared once the status register is read, but it will again be generated when
the next conversion has completed. It will continue to do so until the temperature goes
Hot
below the hysteresis limit.
Temperature
0
Interrupt R/W A 0 on Bit 1 and a 1 on Bit 0 selects the one-time interrupt mode which gives the user an
mode select
indefinite interrupt when it goes above the hot limit. The interrupt will be cleared once the
Bit 0
status register is read. Another interrupt will not be generated until the temperature first goes
below the hysteresis limit. It will also be cleared if the status register is read. No more
interrupts will be generated until the temperature goes above the hot limit again. The
corresponding bit will be cleared in the status register every time it is read but may not set
again when the next conversion is done.
1
Hot
Temperature
Interrupt
mode select
Bit 1
A 1 on this bit (Bit 1) and a 0 on Bit 0 selects the comparator mode. This gives an SMI
R/W
when the temperature exceeds the hot limit. This SMI remains active until the status register
is read or the temperature goes below the hot limit (no hysteresis), when the SMI will
become inactive.
2-6 Reserved R/W Default = 00000.
7
Temp [0]
R Ninth bit of the temperature (Value = 0.5°C).
TEST REGISTER (ADDRESS 0x15h; POWER-UP DEFAULT = 00h)
Table 10.13
ADDRESS <A7:0A>h R/W
DESCRIPTION
15h
Note 3 Power-up Default = 00h
ANALOG OUTPUT (ADDRESS 0x19h; POWER-UP DEFAULT = FFh)
Table 10.14
ADDRESS <A7:0A>h
19h
R/W
R/W
DESCRIPTION
Power-up Default = FFh. No other reset affects this register. FFh
value set analog out to MAX value = 1.25V.
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