Description
Meets JEDEC Specification 42.4 TSE2002B1, 3 Jun 2009. The NXP SemiconductorsSE97B measures temperature from −40 °C to +125 °C with JEDEC Grade B ±1 °Cmaximum accuracy between +75 °C and +95 °C critical zone and also provide 256 bytesof EEPROM memory communicating via the I2C-bus/SMBus. It is typically mounted on aDDR3 Dual In-Line Memory Module (DIMM) measuring the DRAM temperature inaccordance with the new JEDEC (JC-42.4) Mobile Platform Memory Module TemperatureSensor Component specification and also replacing the Serial Presence Detect (SPD)which is used to store memory module and vendor information.
The SE97B thermal sensor and EEPROM operates over the VDD range of 3.0 V to 3.6 V.
The TS consists of a ΔΣ Analog to Digital Converter (ADC) that monitors and updates itsown temperature readings 10 times per second, converts the reading to a digital data, andlatches them into the data temperature register. User-programmable registers, thespecification of upper/lower alarm and critical temperature trip points, EVENT outputcontrol, and temperature shutdown, provide flexibility for DIMM temperature-sensingapplications.
When the temperature changes beyond the specified boundary limits,the SE97B outputsan EVENT signal using an open-drain output that can be pulled up between 0.9 V and3.6 V. The user has the option of setting the EVENT output signal polarity as either anactive LOW or active HIGH comparator output for thermostat operation, or as atemperature event interrupt output for microprocessor-based systems. The EVENT outputcan also be configured as only a critical temperature output.
The EEPROM is designed specifically for DRAM DIMMs SPD. The lower 128 bytes(address 00h to 7Fh) can be Permanent Write Protected (PWP) or Reversible WriteProtected (RWP) by software. This allows DRAM vendor and product information to bestored and write protected. The upper 128 bytes (address 80h to FFh) are not writeprotected and can be used for general purpose data storage.
The SE97B has a single die for both the temp sensor and EEPROM for higher reliabilityand supports the industry-standard 2-wire I2C-bus/SMBus serial interface. The SMBusTIMEOUT function is supported to prevent system lock-ups. Manufacturer and Device IDregisters provide the ability to confirm the identity of the device. Three address pins allowup to eight devices to be controlled on a single bus.
The SE98B is available as the SE97B thermal sensor only.
Features
1 General features
JEDEC (JC-42.4) DIMM temperature sensor plus 256-byte serial EEPROM for SerialPresence Detect (SPD)
SDA open-drain output design for best operation in distributed multi-point applications
Shutdown current: 0.1 μA (typ.) and 5.0 μA (max.)
Power-on reset: 1.8 V (typ.)
2-wire interface: I2C-bus/SMBus compatible, 0 Hz to 400 kHz
SMBus Alert Response Address and TIMEOUT 25 ms to 35 ms (programmable)
ESD protection exceeds 2500 V HBM per JESD22-A114, 250 V MM perJESD22-A115, and 1000 V CDM per JESD22-C101
Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
Available in HWSON8 package
2 Temperature sensor features
11-bit ADC Temperature-to-Digital converter with 0.125 °C resolution
Voltage range: 3.0 V to 3.6 V
Operating current: 250 μA (typ.) and 400 μA (max.)
Programmable hysteresis threshold: off, 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
±1.0 °C/±2 °C (typ./max.) → +40 °C to +125 °C
±2.0 °C/±3 °C (typ./max.) → −40 °C to +125 °C
3 Serial EEPROM features
Read and write voltage range: 3.0 V to 3.6 V
Operating current:
Write → 0.6 mA (typ.) for 3.5 ms (typ.)
Read → 100 μA (typ.)
Organized as 1 block of 256 bytes (256 × 8)
100,000 write/erase cycles and 10 years of data retention
Permanent and Reversible Software Write Protect
Software Write Protection for the lower 128 bytes
The product is in the warehouse and can be shipped immediately
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