STTS424BDN3F STMicroelectronics, STTS424BDN3F Datasheet - Page 20

• Manufacturer Part Number: STTS424BDN3F
• Description: IC MEMORY MOD TEMP SENSOR 8-TDFN
• Manufacturer: STMicroelectronics

Specifications of STTS424BDN3F

• Function: Temp Monitoring System (Sensor)
• Topology: ADC (Sigma Delta), Register Bank
• Sensor Type: Internal
• Sensing Temperature: -40°C ~ 125°C
• Output Type: I²C™/SMBus™
• Output Alarm: Yes
• Output Fan: No
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-TDFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-8502-2

Temperature sensor registers
4.2.5
Note:
20/36
Event output pin functionality
The EVENT pin is an open drain output and requires a pull-up resistor to V
motherboard or incorporated into the master controller.
Figure 9
change.
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 bit (bits 10 and 9) is 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
Figure 8 on page 19
Similarly, when using the “below alarm window” bit (temperature register bit 13, see
on page
alarm temperature lower boundary register (see
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
and
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.
If in interrupt mode and the temperature reaches the critical temperature, the EVENT pin
remains asserted until the temperature drops below the critical limit minus hysteresis.
Hysteresis is also applied to the EVENT pin functionality. When either of the lock bits (bits 6
or 7) is set, these bits cannot be altered.
Table 10 on page 19
22) will be set to '0'. The temperature is equal to or greater than the value set in the
shows the defined outputs of the EVENT correspondent to the temperature
and
Table 10 on page 19
for details).
Table 12 on page
for details.
Table 16 on page
Table 15 on page
22) and hysteresis is set to
24). As the temperature
23).
Figure 8 on page 19
DD
on the system
STTS424
Table 12