M62021 Ver la hoja de datos (PDF) - Renesas Electronics
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Fabricante
M62021 Datasheet PDF : 14 Pages
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M62021L/P/FP
Pin Description
Pin No.
1
2
3
4
5
6
7
8
Pin Name
Power supply output
Backup power supply
input
Power supply input
Delay capacitor
connection pin
Positive reset output
Ground
Negative reset output
Chip select output
Symbol
VOUT
VBAT
VIN
Ct
RES
GND
RES
CS
Function
VIN and VBAT are controlled by means of an internal switch and output
through VOUT.
The pin is capable of outputting up to 100 mA. Use it as VDD of CMOS
RAM and the like.
Backup power supply is connected to this pin.
If a lithium battery is used, insert a resistor in series for safety purposes.
+5 V input pin. Connect to a logic power supply.
A delay capacitor is connected to this pin. By connecting a capacitor, it is
possible to delay each output.
Connect to the positive reset input of a microcomputer. The pin is capable
of flowing 1 mA sink current.
Reference for all signals.
Connect to the negative reset input of a microcomputer. The pin is
capable of flowing 1 mA sink current.
Connect to the chip select of RAM. The CS output is at low level in normal
state thereby letting RAM be active. Under failure or backup condition, the
CS output is set to high level, then RAM enters standby state disabling
read/write function. The pin is capable of flowing a 1 mA sink current.
Application Example
+5V
(Main power supply) VIN
3
CIN+
R1
VDD
R2
MCU
or
CPU
RES
7
RES
5
M62021
SW
Com
–
+
1.24V
Reset
circuit
Delay
circuit
6
GND
Note)2
VOUT
1
D1
+ COUT
VDD
VBAT
2
+
Battery
3V
CS
8
CMOS
RAM
Ct
4
+ C1
Note)1
Notes: * Capacitance to be connected: CIN: 10µF, COUT: 4.7µF, Ct: 4.7µF
1. If connecting a zener diode, select one of VZ ≈ 2V to 3V. (IZ = 0.1mA)
2. When it is necessary to charge the back-up power supply such as using the large-capacity capacitor,
connect it to VIN via a diode and a protection resistor.
Figure 2 Application Example
REJ03D0784-0200 Rev.2.00 Jun 15, 2007
Page 5 of 13
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