SE98TK,118 NXP Semiconductors, SE98TK,118 Datasheet - Page 6

• Manufacturer Part Number: SE98TK,118
• Description: IC TEMP SENSOR I2C 8HVSON
• Manufacturer: NXP Semiconductors

Specifications of SE98TK,118

• 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-HVSON
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-3347-2; 935281692118; SE98TK-T

NXP Semiconductors
SE98_4
Product data sheet
7.3.1 EVENT pin output voltage levels and resistor sizing
7.3 EVENT output condition
The EVENT output indicates conditions such as the temperature crossing a predefined
boundary. The EVENT modes are very configurable and selected using the configuration
register (CONFIG). The interrupt mode or comparator mode is selected using CONFIG[0],
using either TCRIT/UPPER/LOWER or TCRIT only temperature bands (CONFIG[2]) as
modified by hysteresis (CONFIG[10:9]). The UPPER/LOWER (CONFIG[6]) and TCRIT
(CONFIG[7]) bands can be locked.
temperature versus time, with the corresponding behavior of the EVENT output in each of
these modes.
Upon device power-up, the default condition for the EVENT output is high-impedance to
prevent spurious or unwanted alarms, but can be later enabled (CONFIG[3]). EVENT
output polarity can be set to active HIGH or active LOW (CONFIG[1]). EVENT status can
be read (CONFIG[4]) and cleared (CONFIG[5]).
If the device enters Shutdown mode (CONFIG[8]) with asserted EVENT output, the output
remains asserted during shutdown.
The EVENT open-drain output is typically pulled up to a voltage level from 0.9 V to 3.6 V
with an external pull-up resistor, but there is no real lower limit on the pull-up voltage for
the EVENT pin since it is simply an open-drain output. It could be pulled up to 0.1 V and
would not affect the output. From the system perspective, there will be a practical limit.
That limit will be the voltage necessary for the device monitoring the interrupt pin to detect
a HIGH on its input. A possible practical limit for a CMOS input would be 0.4 V. Another
thing to consider is the value of the pull-up resistor. When a low supply voltage is applied
to the drain (through the pull-up resistor) it is important to use a higher value pull-up
resistor, to allow a larger maximum signal swing on the EVENT pin.
•
Advisory note:
– NXP device: After power-up, bit 3 (1) and bit 2 or bit 0 (leave as 0 or 1) can be set
– Competitor device: Does not require that bit 3 be cleared (e.g., set back to (0))
– Work-around: In order to change bit 2 or bit 0 once bit 3 (1) is set, bit 3 (0) must be
– SE98B will allow bit 2 or bit 0 to be changed even if bit 3 is set.
at the same time (e.g., in same byte) but once bit 3 is set (1) then changing bit 2 or
bit 0 has no effect on the device operation.
before changing bit 2 or bit 0.
cleared in one byte and then change bit 2 or bit 0 and reset bit 3 (1) in the next
byte.
Rev. 04 — 2 February 2009
Figure 5
shows an example of the measured
DDR memory module temp sensor, 3.3 V
© NXP B.V. 2009. All rights reserved.
SE98
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