EVAL-ADT7467EB Analog Devices Inc, EVAL-ADT7467EB Datasheet - Page 25

• Manufacturer Part Number: EVAL-ADT7467EB
• Description: BOARD EVALUATION FOR ADT7467
• Manufacturer: Analog Devices Inc
• Series: dBCool®r

Specifications of EVAL-ADT7467EB

• Sensor Type: Temperature
• Sensing Range: -40°C ~ 120°C
• Interface: SMBus (2-Wire/I²C)
• Sensitivity: ±1.5°C
• Voltage - Supply: 3 V ~ 5.5 V
• Embedded: No
• Utilized Ic / Part: ADT7467
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Generating SMBALERT Interrupts
from THERM Timer Events
The ADT7467 can generate SMBALERT s when a programma-
ble THERM timer limit has been exceeded. This allows the
system designer to ignore brief, infrequent THERM assertions
while capturing longer THERM timer events. Register 0x7A is
the THERM timer limit register. This 8-bit register allows a
limit from 0 sec (first THERM assertion) to 5.825 sec to be set
before an SMBALERT is generated. The THERM timer value is
compared with the contents of the THERM timer limit register.
If the THERM timer value exceeds the THERM timer limit, the
TIMER LIMIT
(REG. 0x7A)
THERM
728.32ms
364.16ms
182.08ms
91.04ms
45.52ms
22.76ms
2.914s
1.457s
0
Figure 32. Functional Block Diagram of THERM Monitoring Circuitry
1
2
3
4
5
6
7
COMPARATOR
Rev. A| Page 25 of 80
CLEARED
ON READ
7 6 5 4 3 2 1 0
IN
LATCH
RESET
F4P bit (Bit 5) of Status Register 2 is set and an SMBALERT is
generated. Note that the F4P bit (Bit 5) of Mask Register 2
(Reg. 0x75) masks SMBALERT if this bit is set to 1; however,
the F4P bit of Interrupt Status Register 2 remains set if the
THERM timer limit is exceeded.
Figure 32 is a functional block diagram of the THERM timer,
limit, and associated circuitry. Writing a value of 0x00 to the
THERM timer limit register (Reg. 0x7A) causes SMBALERT to
be generated upon the first THERM assertion. A THERM timer
limit value of 0x01 generates an SMBALERT once cumulative
THERM assertions exceed 45.52 ms.
OUT
1 = MASK
MASK REGISTER 2
STATUS REGISTER 2
F4P BIT (BIT 5)
(REG. 0x75)
F4P BIT (BIT 5)
THERM TIMER CLEARED ON READ
2.914s
1.457s
728.32ms
364.16ms
182.08ms
91.04ms
45.52ms
22.76ms
THERM TIMER
(REG. 0x79)
SMBALERT
THERM
ADT7467