STTS424E02BDA3E STMICROELECTRONICS [STMicroelectronics], STTS424E02BDA3E Datasheet - Page 22

• Manufacturer Part Number: STTS424E02BDA3E
• Description: Memory module temperature sensor with a 2 Kb SPD EEPROM
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Temperature sensor registers
4.2.5
Note:
22/51
Event output pin functionality
The Event outputs can be programmed to be configured as either a comparator output or as
an interrupt. This is done by enabling the Output Control bit (Bit 3) and setting the Event
mode bit (Bit 0). The output pin polarity can also be specified as active-high or active-low by
setting the Event polarity bit (Bit 1).
When the Hysteresis bits (Bits 10 and 9) are enabled, hysteresis may be used to sense
temperature movement around trigger points. For example, when using the “Above Alarm
window” bit (Temperature register Bit 14, see
3°C, as the temperature rises, Bit 14 is set (Bit 14 = 1). The temperature is above the alarm
window and the Temperature register contains a value that is greater than the value set in
the Alarm Temperature Upper Boundary register (see
If the temperature decreases, Bit 14 will remain set until the measured temperature is less
than or equal to the value in the Alarm Temperature Upper Boundary register minus 3°C
(see
Similarly, when using the “Below Alarm window” bit (Temperature register Bit 13, see
Table 12 on page
set in the Alarm Temperature Lower Boundary register (see
temperature decreases, Bit 13 will be set to '1' when the value in the Temperature register is
less than the value in the Alarm Temperature Lower Boundary register minus 3°C (see
Figure 8 on page 21
The device will retain the previous state when entering the Shutdown mode. If the device
enters the Shutdown mode while the EVENT pin is low, the Shutdown current will increase
due to the additional event output pull-down current.
Hysteresis is also applied to the EVENT pin functionality. When either of the Lock bits (Bits 6
and 7) are set, these bits cannot be altered.
Figure 8 on page 21
24) will be set to '0'. The temperature is equal to or greater than the value
and
Table 10 on page 21
and
Table 10 on page 21
Table 12 on page
for details.
for details.
Table 15 on page
Table 16 on page
24) and hysteresis is set to
25).
STTS424E02
26). As the