描述 Description

Overview 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 I2C-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.

特性 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: I2C-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
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

應(yīng)用 Application

DDR2 and DDR3 memory modules
Laptops, personal computers and servers
Enterprise networking
Hard disk drives and other PC peripherals