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SE98
Datasheet
General description
The NXP Semiconductors SE98 measures temperature from -20 Cel to +125 Cel 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 Component specification.
Placing the Temp Sensor (TS) on DIMM allows accurate monitoring of the DIMM module temperature to better estimate the DRAM case temperature (Tcase) to prevent it from exceeding the maximum operating temperature of 85 Cel. The chip set throttles the memory traffic based on the actual temperatures instead of the calculated worst-case temperature or the ambient temperature using a temp sensor mounted on the motherboard. There is up to a 30 pct improvement in thin and light notebooks that are using one or two 1G SO-DIMM modules, although other memory modules such as in server applications will also see an increase in system performance. Future uses of the TS will include more dynamic control over thermal throttling, the ability to use the Alarm Window to create multiple temperature zones for dynamic throttling and to save processor time by scaling the memory refresh rate.
The 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 SE98 outputs an EVENT signal. 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 SE98 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. To maintain interchangeability with the I2C-bus/SMBus interface the electrical specifications are specified with the operating voltage of 3.0 V to 3.6 V.
Features
General features
- JEDEC (JC-42.4) SO-DIMM temperature sensor
- Optimized for voltage range: 3.0 V to 3.6 V
- Shutdown/Standby current: 8 uA (typ.) and 15 uA (max.)
- 2-wire interface: I2C-bus/SMBus compatible, 0 Hz to 400 kHz
- SMBus ALERT and TIMEOUT (programmable)
- Available packages: TSSOP8 and HVSON8
Temperature sensor features
- Temperature-to-Digital converter
- Operating current: 200 uA (typ.) and 250 uA (max.)
- Programmable hysteresis threshold: 0 Cel, 1.5 Cel, 3 Cel, 6 Cel
- Over/under/critical temperature EVENT output
- C grade accuracy:
- +-1 Cel/+-2 Cel (typ./max.) → +75 Cel to +95 Cel
- +-2 Cel/+-3 Cel (typ./max.) → +40 Cel to +125 Cel
- +-3 Cel/+-4 Cel (typ./max.) → -20 Cel to +125 Cel
Products/packages
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| SE98PW | SE98PW-T | 9352 816 93118 | Volume production | SOT530-1
(TSSOP8) | Reel Pack, SMD, 13" | Standard Marking | SE98PW
| Always Pb-free |
| SE98TK | SE98TK-T | 9352 816 92118 | Volume production | SOT908-1
(HVSON8) | Reel Pack, SMD, 13" | Standard Marking | SE98TK
| Always Pb-free |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|
| SE98PW | 9352 816 93118 | NA | DIGI-KEY CORPORATION | 2,500 | 12/3/2008 | Buy online | Order samples | |
| NA | DIGI-KEY CORPORATION | 3,961 | 12/3/2008 | Buy online | ||||
| SE98TK | 9352 816 92118 | NA | AVNET ELECTRONICS MARKETING | 6,000 | 12/3/2008 | Buy online | Order samples | |
| NA | DIGI-KEY CORPORATION | 6,000 | 12/3/2008 | Buy online | ||||
| NA | DIGI-KEY CORPORATION | 11,807 | 12/3/2008 | Buy online |
Applications
- DDR2 and DDR3 memory modules
- Laptops, personal computers and servers
- Enterprise networking
- Hard disk drives and other PC peripherals
Related applications
LCD display - discretes focus
PDA - discretes focus
Motherboard components
50-60 Hz CRT integrated DTV (TV210D)
Mid-range integrated DTV (TV810)
Intelligent washing machine
Transceiver board
Power amplifier board
Main CPU board
LCD TV - MMS functionality
Design support
Application Notes
AN10216_1;
I2C manual (27-Mar-03)
Support Documents
75016543;
An industry-leading portfolio of cost-effective, power-saving solutions for major home appliances (2008-06-01)
75011212;
I2C 2002-1A Evaluation Board Kit (01-Mar-03)
UM10204_3;
I2C-bus specification and user manual (26-Jun-07)
75016189;
NXP I (2008-06-01)
Parametrics/similar products
| Type number | Package | Standby current(uA) | Operating temp.(Cel) | Accuracy on-chip( ±°C) | Assignable Addresses | Over Temperature Alert | Remote Temperature Monitor | SMBus Clock (max)(kHz) | Under Temperature Alert | Operating voltage(VDC) |
|---|---|---|---|---|---|---|---|---|---|---|
| SE98PW | SOT530-1
(TSSOP8) | 15 | -20~125 | 2@-75~95 3@40~125 | 8 | yes | no | 400.0 | yes | 3.0~3.6 |
| SE98TK | SOT908-1
(HVSON8) | 15 | -20~125 | 2@-75~95 3@40~125 | 8 | yes | no | 400.0 | yes | 3.0~3.6 |
Similar products
SE98
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