S-5855A

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. ...