SE95DP datasheet(19/27 Pages) NXP

19 / 27 page

SE95_7

Product data sheet

Rev. 07 — 2 September 2009

19 of 27

NXP Semiconductors

SE95

Ultra high accuracy digital temperature sensor and thermal watchdog

14. Application information

The SE95 is sensitive to power supplies with ramp-up time

≤2 ms and could NACK or

hang the I2C-bus. In most applications the SE95 will function properly since power

supplies have a >2 ms ramp-up time. If the power supply ramp-up time is

≤2 ms, use an

RC network with R = 300

Ω and C = 10 µF, as shown in Figure 18, to add about 3 ms to

the ramp-up time. The 10

µF capacitor is the same as the bypass capacitor that is

typically used to prevent ﬂuctuations on the power supply. The 300

Ω resistor will reduce

the supply voltage by about 45 mV since the SE95 supply current is about 150

µA. Ensure

the SE95 is the only device connected to the end of 300

Ω resistor since additional

devices would draw more current and cause a larger voltage drop across the resistor.

Fig 18.

Typical application circuit

002aae891

10 k

Ω

SE95

detector or

interrupt line

SCL

SDA

VCC

power supply

GND

digital logic

or tie to

VCC or GND

I2C-bus

µF

300

Ω

power supply

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