STTS424BDN3F STMicroelectronics, STTS424BDN3F Datasheet - Page 6

• 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

Description
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Description
The STTS424 is targeted for DIMM modules in mobile personal computing platforms
(laptops), server memory modules, and other industrial applications. The thermal sensor
(TS) in the STTS424 is fully compliant with the JEDEC specification which defines memory
module thermal sensors requirements for mobile platforms.
The TS provides space as well as cost savings for mobile and server platform dual inline
memory modules (DIMM) manufacturers as it is packaged in the compact 2 mm x 3 mm
(height 0.80 mm) 8-lead TDFN package which is compliant to JEDEC MO-229, variation
WCED-3.
The temperature sensor includes a band gap-based temperature sensor and 10-bit analog-
to-digital converter (ADC) which monitor and digitize the temperature to a resolution of up to
0.25°C. The typical accuracies over these temperature ranges are:
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The temperature sensor in the STTS424 is specified for operating at supply voltages from
2.7 V to 3.6 V. Operating at 3.3 V, the supply current is 100 µA (typ).
The on-board sigma delta ADC converts the measured temperature to a digital value that is
calibrated in °C. For Fahrenheit applications, a lookup table or conversion routine is
required. The STTS424 is factory-calibrated and requires no external components to
measure temperature.
The digital temperature sensor component has user-programmable registers that provide
the capabilities for DIMM temperature-sensing applications. The open drain event output pin
is active when the monitoring temperature exceeds a programmable limit, or it falls above or
below an alarm window. The user has the option to set the event output as a critical
temperature output. This pin can be configured to operate in either a comparator mode for
thermostat operation or in interrupt mode.
±3°C (max) over the full temperature measurement range of –40°C to 125°C
±2°C in the +40°C to +125°C temperature range and
±1°C in the +75°C to +95°C temperature range
STTS424