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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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PWM OUTPUT TEMPERATURE SENSOR IC
S-5855A Series
Rev.1.2_00
3. Product name list
(1) SNT-4A
Table 1
Product name
S-5855AACA-I4T1U
Duty ratio
change-start
temperature
TS*1 [°C]
+40
Duty ratio
temperature
sensitivity
Ddt(s)*2 [%/°C]
3
Output form
CMOS output
TSP5*3 [°C]
+45
TEM5*4 [°C]
+60
S-5855AEAA-I4T1U
+80
1
CMOS output
+85
+125
S-5855AECA-I4T1U
+80
3
CMOS output
+85
+100
*1. TS : Duty ratio change-start temperature set by user
*2. Ddt(s) : Duty ratio temperature sensitivity set by user
*3. TSP5 : Temperature 5°C higher than duty ratio change-start temperature TS (Refer to Table 12 for details)
*4. TEM5 : Higher temperature when measuring duty ratio temperature sensitivity (Refer to Table 12 for details)
Remark Please contact our sales office for products other than those specified above.
(2) SOT-23-5
Product name
S-5855AAAA-M5T1U
S-5855AAAB-M5T1U
S-5855AADA-M5T1U
Duty ratio
change-start
temperature
TS*1 [°C]
+40
+40
+40
Table 2
Duty ratio
temperature
sensitivity
Ddt(s)*2 [%/°C]
1
1
4
Output form
CMOS output
Nch open-drain output
CMOS output
TSP5*3 [°C]
+45
+45
+45
TEM5*4 [°C]
+115
+115
+55
*1. TS : Duty ratio change-start temperature set by user
*2. Ddt(s) : Duty ratio temperature sensitivity set by user
*3. TSP5 : Temperature 5°C higher than duty ratio change-start temperature TS (Refer to Table 12 for details)
*4. TEM5 : Higher temperature when measuring duty ratio temperature sensitivity (Refer to Table 12 for details)
Remark Please contact our sales office for products other than those specified above.
4 Seiko Instruments Inc.

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Rev.1.2_00
„ Pin Configurations
SNT-4A
Top view
14
23
Figure 3
SOT-23-5
Top view
54
12 3
Figure 4
PWM OUTPUT TEMPERATURE SENSOR IC
S-5855A Series
Pin No.
1
2
3
4
Table 3
Symbol
VSS
CF
VDD
DOUT
Pin Description
GND pin
Connection pin for frequency
control capacitor
Power supply pin
Output pin
Table 4
Pin No.
Symbol
Pin Description
1 CF Connection pin for frequency
control capacitor
2
VSS
GND pin
3
NC*1
No connection
4
DOUT
Output pin
5
VDD
Power supply pin
*1. The NC pin is electrically open.
The NC pin can be connected to VDD pin or VSS pin.
Seiko Instruments Inc.
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