Rev.1.2
_00
TEMPERATURE SWITCH IC WITH LATCH
S-5840B Series
The temperature switch IC S-5840B Series with a latch function detects
temperature with the accuracy of
±2.5°C.
When the temperature reaches
the detection temperature, the output signal is inverted and being latched
until this IC detects decrease in a power supply voltage.
The minimum power supply voltage is 1.0 V which is required to operate
this IC, the current consumption is as low as 12
µA
(typ.) due to CMOS
configuration. The S-5840B Series has a temperature sensor using
negative temperature coefficient, a reference voltage source, comparator,
voltage detection circuit and noise suppression circuit on a chip, and they
are enclosed in package SOT-23-5.
Since the temperature range of this IC is
−40
to +100°C, it is possible to
achieve the extensive application for temperature control.
Features
•
•
•
•
•
•
•
•
•
•
Detection temperature :
+55
to
+95°C,
1°C step, detection accuracy :
±2.5°C
Wide voltage range during operation : V
DD
=
1.0 to 10.0 V
Release voltage :
2.2 to 3.4 V, 0.1 V step
Low current consumption :
12
µA
typ. (+25°C)
Built-in circuit for preventing temperature detection malfunction
Output logic level is fixed by the latch after temperature detection
Output logic active high or active low is selectable
Output CMOS or Nch open drain is selectable
Package :
SOT-23-5
Lead-free product
Applications
•
Game consoles
•
Electronic devices
Package
Package Name
SOT-23-5
Package
MP005-A
Drawing Code
Tape
MP005-A
Reel
MP005-A
Seiko Instruments Inc.
1
TEMPERATURE SWITCH IC WITH LATCH
S-5840B Series
Block Diagram
1.
S-5840B with CMOS output
VDD
Rev.1.2
_00
Temperature
Sensor
+
-
V
REF
CD
Reference
Voltage
Source
Voltage
Detector
D Q
D-F/F
CK R
DET
VSS
RT
Figure 1
2. S-5840B with Nch open drain output
VDD
Temperature
Sensor
+
-
V
REF
CD
Reference
Voltage
Source
Voltage
Detector
D Q
D-F/F
CK R
DET
VSS
RT
Figure 2
2
Seiko Instruments Inc.
Rev.1.2
_00
Product Name Structure
1. Product name
S-5840B
xx
- M5T1
G
TEMPERATURE SWITCH IC WITH LATCH
S-5840B Series
Package abbreviation and IC packing specifications
*1
M5T1 : SOT-23-5, tape
Option code
*2
*1.
Refer to the taping specifications at the end of this booklet.
*2.
Option list
•
Detection temperature (T
DET
) is selectable in 1
°
C step in the range of 55 to 95
°
C.
•
DET output is selectable in active high or active low.
•
DET output is selectable in CMOS or Nch open drain.
•
Release voltage (V
RET
) is selectable in 0.1 V step in the range of 2.2 to 3.4 V.
2. Product name list
Table 1
Output form
Output logic
Detection temperature
(T
DET
)
S-5840BAG-M5T1G
60
°
C
CMOS
Active low
S-5840BAH-M5T1G
90
°
C
CMOS
Active high
S-5840BAJ-M5T1G
80
°
C
Nch open drain
Active low
Remark
Please contact our sales office for options other than that specified above.
Product name
Release voltage (V
RET
)
2.9 V
2.9 V
2.2 V
Seiko Instruments Inc.
3
TEMPERATURE SWITCH IC WITH LATCH
S-5840B Series
Pin Configuration
SOT-23-5
Top view
5
4
Table 2
Rev.1.2
_00
Pin No.
1
2
3
Symbol
RT
*1
VSS
CD
Description
Test pin
GND pin
Capacitor connection pin for setting
malfunction prevention time
Output pin
Power supply pin
1
2
Figure 3
3
*1.
4
DET
5
VDD
Set the RT pin open in use.
Remark
See Dimensions for details of the package drawings.
Absolute Maximum Ratings
Table 3
Parameter
Power supply voltage (V
SS
=
0 V)
Pin voltage
Output voltage
Power dissipation
Operating temperature
Storage temperature
CMOS output
Nch open drain output
Symbol
V
DD
V
RT
, V
CD
V
DET
P
D
T
opr
T
stg
(Ta
=
25
°
C unless otherwise specified)
Rating
Unit
V
SS
+
12
V
V
SS
−
0.3 to V
DD
+
0.3
V
SS
−
0.3 to V
DD
+
0.3
V
SS
−
0.3 to V
SS
+
12.0
300 (When not mounted on board)
600
*1
−
40 to
+
100
−
55 to
+
125
V
V
V
mW
mW
°
C
°
C
*1.
When mounted on board
[Mounted board]
(1) Board size :
114.3 mm
×
76.2 mm
×
t1.6 mm
(2) Board name : JEDEC STANDARD51-7
Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical
damage. These values must therefore not be exceeded under any conditions.
Recommended Values for External Parts
Table 4
Parameter
CD capacitance
Symbol
C
D
Value
4.7
Unit
nF
4
Seiko Instruments Inc.
Rev.1.2
_00
DC Electrical Characteristics
1. Product with CMOS output
TEMPERATURE SWITCH IC WITH LATCH
S-5840B Series
Table 5
Parameter
Power supply voltage
Detection temperature
Output current
Release voltage for
built-in voltage detector
Hysteresis width for
built-in voltage detector
Temperature
coefficient for built-in
voltage detector
Operating current
Symbol
V
DD
T
D
I
DETH
I
DETL
V
R
V
HYS
∆
V
RET
∆
Ta
•
V
RET
Conditions
−
−
V
DD
= 3.5 V,
Apply for DET
pin
−
−
V
DET
= 2.7 V
V
DET
= 0.4 V
(Ta
=
25°C, unless otherwise specified)
Min.
Typ.
Max.
Unit
1.0
T
DET
−
2.5
2
0.5
V
RET
×
0.98
−
−
T
DET
9.4
2.8
V
RET
V
RET
×
0.05
±100
12
10.0
T
DET
+
2.5
−
−
V
RET
×
1.02
−
V
°C
mA
mA
V
V
ppm/
°C
µA
Ta =
−40
to
+100°C
V
DD
= 3.5 V
−
−
−
24
I
DD
2. Product with Nch open drain output
Table 6
Parameter
Power supply voltage
Detection temperature
Output current
Release voltage for
built-in voltage detector
Hysteresis width for
built-in voltage detector
Temperature
coefficient for built-in
voltage detector
Operating current
Symbol
V
DD
T
D
I
DETL
I
LEAK
V
R
V
HYS
∆
V
RET
∆
Ta
•
V
RET
Conditions
−
−
V
DET
= 0.4 V, V
DD
= 3.5 V
V
DET
= 10.0 V, V
DD
= 3.5 V
−
−
(Ta
=
25°C, unless otherwise specified)
Min.
Typ.
Max.
Unit
1.0
−
10.0
V
T
DET
−
2.5
T
DET
T
DET
+
2.5
°C
0.5
−
V
RET
×
0.98
−
2.8
−
V
RET
V
RET
×
0.05
±100
12
−
100
V
RET
×
1.02
−
mA
nA
V
V
ppm/
°C
µA
Ta =
−40
to
+100°C
V
DD
= 3.5 V
−
−
−
24
I
DD
AC Electrical Characteristics
Table 7
Parameter
Noise filtering time
Symbol
t
noise
Conditions
C
D
=
4.7 nF, V
DD
=
3.5 V,
Ta
=
detection temperature
Min.
10
Typ.
30
Max.
50
Unit
ms
Seiko Instruments Inc.
5
Analog electronics
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