SE98ATP,547 NXP Semiconductors, SE98ATP,547 Datasheet - Page 11

• Manufacturer Part Number: SE98ATP,547
• Description: IC TEMP SENSOR DDR 8-HWSON
• Manufacturer: NXP Semiconductors

Specifications of SE98ATP,547

• Function: Temp Monitoring System (Sensor)
• Topology: ADC (Sigma Delta), Register Bank
• Sensor Type: Internal
• Sensing Temperature: -40°C ~ 125°C
• Output Type: I²C™/SMBus™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 1.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-WSON (Exposed Pad), 8-HWSON
• Temperature Threshold: Programmable
• Full Temp Accuracy: +/- 1 C
• Digital Output - Bus Interface: 2-Wire, SMBus, I2C
• Digital Output - Number Of Bits: 11
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 1.7 V
• Description/function: DDR Memory Module Temperature Sensor
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Supply Current: 250 uA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-4731-2; SE98ATP,147

NXP Semiconductors
SE98A_4
Product data sheet
7.5 Power-up default condition
7.6 Device initialization
After power-on, the SE98A is initialized to the following default condition:
SE98A temperature sensors have programmable registers, which, upon power-up, default
to zero. The open-drain EVENT output is default to being disabled, comparator mode and
active LOW. The alarm trigger registers default to being unprotected. The configuration
registers, upper and lower alarm boundary registers and critical temperature window are
defaulted to zero and need to be programmed to the desired values. SMBus TIMEOUT
feature defaults to being enabled and can be programmed to disable. These registers are
required to be initialized before the device can properly function. Except for the SPD,
which does not have any programmable registers, and does not need to be initialized.
Table 4
registers.
Table 4.
Register
01h
02h
03h
04h
22h
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•
•
•
•
•
•
•
Starts monitoring local sensor
EVENT register is cleared—EVENT output is pulled HIGH by external pull-ups
EVENT hysteresis is defaulted to 0 °C
Command pointer is defaulted to ‘00h’
Critical Temp, Alarm Temperature Upper and Lower Boundary Trip register are
defaulted to 0 °C
Capability register is defaulted to ‘0037h’ for the B-grade and VHV capability
Operational mode: comparator
SMBus register is defaulted to ‘00h’
shows the default values and the example value to be programmed to these
Registers to be initialized
Default value
0000h
0000h
0000h
0000h
0000h
Rev. 04 — 25 November 2009
Example value
0209h
0550h
1F40h
05F0h
0000h
DDR memory module temp sensor, 1.7 V to 3.6 V
Description
Configuration register
Upper Boundary Alarm Trip register = 85 °C
Critical Alarm Trip register = 95 °C
SMBus register = no change
Lower Boundary Alarm Trip register = −20 °C
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•
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hysteresis = 1.5 °C
EVENT output = Interrupt mode
EVENT output is enabled
© NXP B.V. 2009. All rights reserved.
SE98A
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