SN8P1600
8-bit micro-controller
11 External Reset Circuit
SN8P1602 External Reset Circuit Example
External Reset Circuit
Pull-up Resistor
VCC
VCC
R5
U1
R1
R3
R4
100K ohm
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
External Oscillator
P1.2
P1.3
P0.0
RST
VSS
P2.0
P2.1
P2.2
P2.3
P1.1
P1.0
XIN
XOUT
VDD
P2.7
P2.6
P2.5
P2.4
40K ohm
33K ohm
1K ohm
Y1
VCC
Q2
NPN
? Hz
C2
C3
R2
20P
20P
10K ohm
Q1
NPN
SN8P1602
C1
0.1uF (104)
Bypass Cap
VCC
P2.0
P2.1
P2.2
P2.3
P2.4
P2.5
P2.6
P2.7
D1
D2
R10
R11
R12
R13
R14
R15
R16
R17
100
100
100
100
100
100
100
100
P1.0
P1.1
P1.2
P1.3
R6
100K
D3
D4
D5
D6
D7
D8
R7
R8
R9
100K
100K
100K
S1
S2
S3
S4
Output Application
Input Application
Notice :
The SN8P1602 do not have the internal power on reset circuit. It is very important to connect the external
component to implement the reset function. The simple RC circuit does not get a good brownout reset.
The External reset circuit in the demo schematic can improve the SN8P1602 power-on/Brown-out reset
performance, but it increases the system power consumption (about 200µA).
SONiX TECHNOLOGY CO., LTD
Page 76
Revision 1.94
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