Document
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.
Rev.1.2_00
DOUT
DOUT
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.
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.
5
PWM OUTPUT TEMPERATURE SENSOR IC S-5855A Series
Rev.1.2_00
Absolute Maximum Ratings
Table 5
(Ta = +25°C, VSS = 0 V, unless otherwise specified)
Item
Symbol
Absolute Maximum Rating
Unit
Power supply voltage
Output voltage
CMOS output product Nch open-drain output product
CF voltage
Output current
Power dissipation
SNT-4A SOT-23-5
VDD VOUT
VCF IOUT PD
VSS −0.3 to VSS +7.0 VSS −0.3 to VDD +0.3 VSS −0.3 to VSS +7.0 VSS −0.3 to VDD +0.3
−13 to +13 300*1 600*1
V V V V mA mW mW
Operating ambient temperature
Topr
−40 to +125
°C
S.