RE46C190S16TF Microchip Technology, RE46C190S16TF Datasheet - Page 27

• Manufacturer Part Number: RE46C190S16TF
• Description: 3V E-Cal Photo S.D. IC 16 SOIC .150in T/R
• Manufacturer: Microchip Technology
• Type: CMOS Photoelectric Smoke Detector ASIC with Interconnect and Timer Moder

Specifications of RE46C190S16TF

• Product: Driver ICs - Various
• Supply Voltage (max): 5 V
• Supply Voltage (min): 2 V
• Supply Current: 1 uA
• Maximum Operating Temperature: + 60 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-16
• Minimum Operating Temperature: - 10 C
• Output Current: - 4 mA
• Output Voltage: 8.5 V
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

5.0
5.1
The supply current shown in the
Characteristics
average standby current and, in most cases, can be a
small fraction of the total, because power consumption
generally occurs in relatively infrequent bursts and
depends on many external factors. These include the
values selected for IRED current and integration time,
the V
level, and the magnitude of any external resistances
that will adversely affect the boost converter efficiency.
TABLE 5-1:
The following paragraphs explain the components in
Table
5.1.1
The I
Electrical Characteristics
5.1.2
Photo Detection Current is the current draw due to the
smoke testing every 10.75 seconds, and the chamber
test every 43 seconds. The current for both the IR
diode and the internal measurement circuitry comes
primarily from V
scaled for both on-time and boost voltage.
 2010 Microchip Technology Inc.
Fixed I
Photo Detection Current
Low Battery Check Current
I
(excluding IR drive)
(excluding IR drive)
DD
BST
5-1, and the calculations in the example.
DD
Smoke Detection
Smoke Detection
DD
Component
APPLICATION NOTES
Standby Current Calculation and
Battery Life
and IR capacitor sizes and leakages, the V
IR drive during
IR drive during
Unloaded Test
is the Supply Current shown in the
Chamber Test
Chamber test
FIXED I
PHOTO DETECTION CURRENT
Loaded Test
BST
table is only one component of the
STANDBY CURRENT CALCULATION
Boost
Load
Load
, so the average current must be
DD
to V
Voltage
V
table.
(V)
3.6
3.6
3.6
3.6
BST1
3.6
3
9
BST2
1.00E-06
1.00E-03
1.00E-03
2.00E-02
1.00E-04
Current
DC Electrical
0.10
0.10
(A)
—
Duration
1.00E-02
2.00E-04
1.00E-02
2.00E-04
1.00E-02
1.00E-02
BAT
DC
(s)
—
—
3.60E-05
7.20E-05
1.80E-03
3.60E-06
3.60E-05
7.20E-05
6.85E-05
Energy
A calculation of the standby current for the battery life
is shown in
parameters:
The contribution to I
calculating the energy consumed by each component,
given its duration. An average power is then calculated
based on the period of the event and the boost
converter efficiency (assumed to be 85% in this case).
An I
average power and the given V
drive contribution during chamber test is detailed in
Equation
EQUATION 5-1:
V
V
V
Boost capacitor size
Boost Efficiency
IRED on time
IRED Current
(J)
—
BAT
BST1
BST2
BAT
contribution is then calculated based on this
5-1:
Period
10.75
10.75
344
344
3.6V 0.1A
-------------------------------------------------- -
(s)
43
43
43
—
43s
Table


0.85 3V
3.00E-06
9.85E-07
1.97E-06
3.94E-06
7.88E-06
6.16E-06
2.34E-07
9.85E-08
Average
Power
5-1, based on the following
(W)

BAT

=
=
=
=
=
=
=
200
Total
RE46C190
3
3.6
9
4.70E-06
8.50E-01
2.000E-04
1.000E-01

is determined by first
s
BAT
Contribution
=
. For example, the IR
1.00E-06
3.28E-07
6.57E-07
1.31E-06
2.63E-06
2.05E-06
7.81E-08
3.28E-08
8.09E-06
0.657
I
DS22271A-page 27
BAT
(A)

A
(µA)
I
1.0
0.3
0.7
1.3
2.6
2.1
0.1
0.0
8.1
BAT