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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

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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.
Rev.1.2_00
DOUT
DOUT

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Rev.1.2_00
„ Product Name Structure
1. Product name
S-5855 A x x x xxxx U
PWM OUTPUT TEMPERATURE SENSOR IC
S-5855A Series
Environmental code
U Lead-free (Sn 100%), halogen-free
Package name (abbreviation) and packing specifications*1
I4T1 SNT-4A, Tape
M5T1 SOT-23-5, Tape
Output form
A CMOS output
B Nch open-drain output
Duty ratio temperature sensitivity
A 1 %/°C
B 2 %/°C
C 3 %/°C
D 4 %/°C
Duty ratio change-start temperature
A +40°C
B +50°C
C +60°C
D +70°C
E +80°C
*1. Refer to the tape drawing.
2. Packages
Package Name
SNT-4A
SOT-23-5
Package
PF004-A-P-SD
MP005-A-P-SD
Drawing Code
Tape
Reel
PF004-A-C-SD
PF004-A-R-SD
MP005-A-C-SD MP005-A-R-SD
Land
PF004-A-L-SD
Seiko Instruments Inc.
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