PWM OUTPUT TEMPERATURE SENSOR IC
S-5855A Series
www.sii-ic.com © Seiko Instruments Inc., 2010-2013
PWM OUTPUT TEMPERATURE SENSOR IC
Rev.1.2_00
The S-5...
Description
S-5855A Series
www.sii-ic.com © Seiko Instruments Inc., 2010-2013
PWM OUTPUT TEMPERATURE SENSOR IC
Rev.1.2_00
The S-5855A Series, developed by CMOS technology, is a 1-wire PWM output temperature sensor IC of low current consumption that itself changes the duty ratio according to temperature. The duty ratio decreases from 100% if exceeding the temperature set by user, and this decrease is linear against the temperature rise. The output form is selectable from CMOS output and Nch open-drain output. Its small packages SNT-4A and SOT-23-5 enable high-density mounting.
Features
PWM output Temperature accuracy Duty ratio change-start temperature Duty ratio temperature sensitivity Low current consumption Low power supply voltage Wide range of operation temperature Lead-free (Sn 100%), halogen-free
: 1-wire PWM interface : ±3.0°C : Selectable from +40°C to +80°C in 10°C step : Selectable from −1 %/°C to −4 %/°C in 1 %/°C step : 50 μA typ. (Ta = +25°C) : 1.65 V to 5.5 V : Ta = −40°C to +125°C
Application
Temperature compensation for LED instruments
Packages
SNT-4A SOT-23-5
Seiko Instruments Inc.
1
PWM OUTPUT TEMPERATURE SENSOR IC S-5855A Series
Block Diagrams
1. CMOS output product
VDD
*1
VSS
Temperature sensor
Triangle wave generator
+ −
CF CFREQ
*1. Parasitic diode
2. Nch open-drain output product
Figure 1
VDD
*1
VSS
Temperature sensor
Triangle wave generator
+ −
CF CFREQ
*1. Parasitic diode
Figure 2
2 Seiko Instruments Inc.
...
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