SE98A DDR memory module temp sensor, 1.7 V to 3.6 V Rev. 04 25 November 2009 Product data sheet 1. General description The NXP Semiconductors SE98A measures temperature from 40 C and +125 C with JEDEC Grade B 1 C accuracy between +75 C and +95 C communicating via the 2 I C-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 Component specification. The SE98A thermal sensor operates over the V range of 1.7 V to 3.6 V. The SE98A DD 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. 2 The SE98A supports the industry-standard 2-wire I C-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. 2. Features JEDEC (JC-42.4) TS3000B1 DIMM 0.5 C (typ.) between 75 C and 95 C temperature sensor Optimized for voltage range: 1.7 V to 3.6 V Shutdown current: 0.1 A (typ.) and 5.0 A (max.) 2 2-wire interface: I C-bus/SMBus compatible, 0 Hz to 400 kHz SMBus ALERT and TIMEOUT (programmable) 11-bit ADC Temperature-to-Digital converter with 0.125 C resolutionNXP Semiconductors SE98A DDR memory module temp sensor, 1.7 V to 3.6 V Operating current: 250 A (typ.) and 400 A (max.) Programmable hysteresis threshold: 0 C, 1.5 C, 3 C, 6 C Over/under/critical temperature EVENT output B grade accuracy: 0.5 C/ 1 C (typ./max.) +75 C to +95 C 1 C/ 2 C (typ./max.) +40 C to +125 C 2 C/ 3 C (typ./max.) 40 C to +125 C 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 3. Applications DDR2 and DDR3 memory modules Laptops, personal computers and servers Enterprise networking Hard disk drives and other PC peripherals 4. Ordering information Table 1. Ordering information Type number Topside Package mark Name Description Version SE98APW S98A TSSOP8 plastic thin shrink small outline package 8 leads SOT530-1 body width 4.4 mm 1 SE98ATP 98A HWSON8 plastic thermal enhanced very very thin small outline package SOT1069-2 no leads 8 terminals body 2 3 0.8 mm SE98ATL 8AL HXSON8 plastic thermal enhanced extremely thin small outline package SOT1052-1 no leads 8 terminals body 2 3 0.5 mm 1 Industry standard 2 mm 3mm 0.8 mm package to JEDEC VCED-3 PSON8 in 8 mm 4 mm pitch tape 4 k quantity reels. SE98A 4 NXP B.V. 2009. All rights reserved. Product data sheet Rev. 04 25 November 2009 2 of 43