M5295AL/AP/AFP
Application Example
M5295A
1
2
3
4
5
6
7
8
Clock
RST1
(RESET)
MCU/MPU
RST2
(HOLD)
V
DD
Figure 8 Application Example
Notice for Use
1. When malfunction occurs due to noise or order related trouble, connect capacitance of approximately 1000 pF
between pin (5) and GND as well as pin (8) and GND to stabilize operation.
2. To adjust detection voltage, add resistance of 15 kΩ or less to both V
CC
and GND via adjusting pins. (Set detection
voltage to no less than 3 V.)
3. Set t
WD
and t
RST(2)
as shown below:
110
µs ≤
t
WD
≤
1.1 s
8.3
µs ≤
t
RST(2)
≤
83 ms
10 kΩ
≤
R
1
≤
30 kΩ
4. Input clock pulses to pin (1) via capacitor. To determine capacitance, refer to “Relationship between input pulse
width and input capacitance Cin”.
Backup power supply
M5295A
10kΩ
R
4
1
2
3
4
5
6
7
R
3
V
CC
8
3.5V
RESET output
To System
Backup switching voltage V
TH2(L)
Switching voltage calculation formula
V
TH2(L)
= R
03
+ R
04
×
1.24 (V)
R
04
R
03
= R
3
// 51.2kΩ
R
04
= R
4
// 18.8kΩ
Note: Set backup switching voltage to be more than or equal to backup supply voltage.
Figure 9 Example of Backup Circuit with M5295AL
REJ03D0780-0200 Rev.2.00 Jun 15, 2007
Page 8 of 12
RENESAS [ RENESAS TECHNOLOGY CORP ]
