Application Note (1)
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AN10216[AN10216]
Design Files
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DDR Memory Module Temp Sensor, 1.7 V to 3.6 V
The NXP Semiconductors SE98A measures temperature from -40 ºC and +125 ºC with JEDEC Grade B ±1 ºC accuracy between +75 ºC and +95 ºC communicating via the I2C-bus/SMBus. It is typically mounted on a Dual In-Line Memory Module (DIMM) measuring the DRAM temperature in accordance with the new JEDEC (JC-42.4) Mobile Platform Memory Module Thermal Sensor Componentspecification.
The SE98A thermal sensor operates over the VDD range of 1.7 V to 3.6 V. The SE98A does not include the 2 k SPD and is designed for custom DIMM where larger SPD is required.
The Temp Sensor (TS) consists of an Analog-to-Digital Converter (ADC) that monitors and updates its own temperature readings 8 times per second, converts the reading to a digital data, and latches them into the data temperature registers. User-programmable registers, such as Shutdown or Low-power modes and the specification of temperature event and critical output boundaries, provide flexibility for DIMM temperature-sensing applications.
When the temperature changes beyond the specified boundary limits, the SE98A outputs an EVENT signal using an open-drain output that can be pulled up between 0.9 V and 3.6 V. The user has the option of setting the EVENT output signal polarity as either an active LOW or active HIGH comparator output for thermostat operation, or as a temperature event interrupt output for microprocessor-based systems. The EVENT output can even be configured as a critical temperature output.
The SE98A supports the industry-standard 2-wire 2-bus/SMBus serial interface. The SMBus TIMEOUT function is supported to prevent system lock-ups. Manufacturer and Device ID registers provide the ability to confirm the identify of the device. Three address pins allow up to eight devices to be controlled on a single bus.
The SE98A is an improved SE98 and is comparable to the thermal sensor in the SE97 but with voltage range of 1.7 V to 3.6 V.
Product Details
Features
- JEDEC (JC-42.4) TS3000B1 DIMM 0.5 ºC (typ.) between 75 ºC and 95 ºC temperature sensor
- Optimized for voltage range: 1.7 V to 3.6 V
- Shutdown current: 0.1 µA (typ.) and 5.0 µA (max.)
- 2-wire interface: 2-bus/SMBus compatible, 0 Hz to 400 kHz
- SMBus ALERT and TIMEOUT (programmable)
- 11-bit ADC Temperature-to-Digital converter with 0.125 ºC resolution
- Operating current: 250 µA (typ.) and 400 µA (max.)
- Programmable hysteresis threshold: 0 ºC, 1.5 ºC, 3 ºC, 6 ºC
- Over/under/critical temperature EVENT output
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B grade accuracy:
- ±0.5 ºC/±1 ºC (typ./max.) » +75 ºC to +95 ºC
- ±1 ºC/±2 ºC (typ./max.) » +40 ºC to +125 ºC
- ±2 ºC/±3 ºC (typ./max.) » -40 ºC to +125 ºC
- ESD protection exceeds 2000 V HBM per JESD22-A114, 250 V MM per JESD22-A115, and 1000 V CDM per JESD22-C101
- Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
- Available packages: TSSOP8, HWSON8 (PSON8 VCED-3) and HXSON8
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