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PDF BD45292 Datasheet ( Hoja de datos )

Número de pieza BD45292
Descripción Counter Timer Built-in CMOS Voltage Detector IC
Fabricantes Rohm 
Logotipo Rohm Logotipo

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BD45292 Hoja de datos, Descripción, Manual
Datasheet
Voltage Detector IC Series
Counter Timer Built-in
CMOS Voltage Detector IC
BD45xxx series BD46xxx series
General Description
ROHM’s BD45xxx and BD46xxx series are highly
accurate, low current consumption Voltage Detector ICs.
Because the counter timer delay circuit is built into
these series, an external capacitor for the delay time
setting is unnecessary. The lineup was established with
low output types (Nch open drain and CMOS output)
and detection voltages range from 2.3V to 4.8V in
increments of 0.1V, so that the series may be selected
according the application at hand.
Features
„ Counter Timer Built-in
„ No delay time setting external capacitor required
„ Ultra-low current consumption
„ Two output types (Nch open drain and CMOS output)
„ Package SSOP5 is similar to SOT-23-5 (JEDEC)
Key Specifications
„ Detection voltage:
2.3V to 4.8V (Typ.)
„ High accuracy detection voltage:
„ Ultra-low current consumption:
„ Operating temperature range:
0.1V steps
±1.0%
0.85µA (Typ.)
-40°C to +105°C
„ Three internal, fixed delay time:
50ms
100ms
200ms
Package
SSOP5
2.90mm x 2.80mm x 1.25mm
Applications
Circuits using microcontrollers or logic circuits that
require a reset.
Typical Application Circuit
VDD1
VDD2
BD45xxx
RL
Micro
RST controller
CL
Noise-filtering
Capacitor
Open Drain Output Type
BD45xxx series
Connection Diagram
SSOP5
VDD
VOUT
GND
TOP VIEW
Marking
Lot. No
ER SUB GND
VDD1
BD46xxx
RST
Micro
controller
GND
CL
Noise-filtering
Capacitor
CMOS Output Type
BD46xxx series
Pin Descriptions
PIN No. Symbol
Function
1 ER Manual Reset
2
SUB
Substrate *
3
GND
GND
4
VOUT
Reset Output
5 VDD Power Supply Voltage
*Connect the substrate to GND.
Product structureSilicon monolithic integrated circuit
.www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
This product is not designed for protection against radioactive rays
1/13
TSZ02201-0R7R0G300010-1-2
15.Nov.2013 Rev.007

1 page

BD45292 pdf
BD45xxx series BD46xxx series
Datasheet
Electrical characteristics (Unless Otherwise Specified Ta=-40 to 105°C) - continued
Parameter
Symbol
Condition
Operating Voltage Range
VOPL
VOL0.4V, RL=470k, Ta=25 to 105°C
VOL0.4V, RL=470k, Ta=-40 to 25°C
‘High’ Output Voltage (Pch)
VOH
VDD=4.8V, ISOURCE= 1.0 mA, VDET(2.3V to 4.2V)
VDD=6.0V, ISOURCE= 1.2 mA, VDET(4.3V to 4.8V)
‘Low’Output Voltage (Nch)
Leak Current when OFF
ER Pin ‘H’ Voltage
ER Pin ‘L’ Voltage
VOL
Ileak
VEH
VEL
VDD=1.2V, ISINK = 0.45 mA
VDD=2.4V, ISINK = 1.3 mA, VDET(2.7V to 4.8V)
VDD=VDS=10V
*1
*1
*1
ER Pin Input Current
IEL
VDET(T):Standard Detection Voltage (2.3V to 4.8V, 0.1V step)
RL :Pull-up resistor to be connected between VOUT and power supply.
CL :Capacitor to be connected between VOUT and GND.
*1 Guarantee is Ta=25°C.
Attention: Please connect the GND when you don’t use ‘ER’
Min.
0.95
1.20
VDD-0.5
VDD-0.5
-
-
-
2.0
-
-
Limit
Typ.
-
-
-
-
-
-
-
-
-
1
Max.
-
-
-
-
0.3
0.3
0.1
-
0.8
10
Unit
V
V
V
µA
V
V
µA
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
5/13
TSZ02201-0R7R0G300010-1-2
15.Nov.2013 Rev.007

5 Page

BD45292 arduino
BD45xxx series BD46xxx series
Circuit Applications
1) Examples of common power supply detection reset circuits.
Datasheet
VDD1
BD45xxx
VDD2
RL
RST
Micro
controller
CL
Noise-filtering
Capacitor
GND
Fig.18 Open Drain Output Type
VDD1
GND
BD46xxx
Micro
RST controller
CL
Noise-filtering
Capacitor
Fig.19 CMOS Output Type
Application examples of BD45xxx series (Open Drain
output type) and BD46xxx series (CMOS output type)
are shown below.
CASE1: Power supply of the microcontroller (VDD2)
differs from the power supply of the reset detection
(VDD1).
Use an open drain output type (BD45xxx) with a load
resistance RL as shown Fig.18.
CASE2: Power supply of the microcontroller (VDD1) is
same as the power supply of the reset detection (VDD1).
Use a CMOS output type (BD46xxx) device or an open
drain output type (BD45xxx) device with a pull up
resistor between the output and VDD1.
When a capacitance CL for noise filtering is connected to
the VOUT pin (the reset signal input terminal of the
microcontroller), please take into account the waveform
of the rise and fall of the output voltage (VOUT).
2) The following is an example of a circuit application in which an OR connection between two types of detection voltage
resets the microcontroller.
VDD1
VDD2
VDD3
BD45xxx
BD45xxx
RL
RST
Micro
controller
Fig. 20
GND
To reset the microcontroller when many independent power supplies are used in the system, OR connect an open drain
output type (BD45xxx series) to the microcontroller’s input with pull-up resistor to the supply voltage of the microcontroller
(VDD3) as shown in Fig. 20. By pulling-up to VDD3, output “High” voltage of micro-controller power supply is possible.
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
11/13
TSZ02201-0R7R0G300010-1-2
15.Nov.2013 Rev.007

11 Page


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