Residue-Voltage Protection - IBM EM78P312N Specification

EM78P312N EM78P809N

5.18.2 Residue-Voltage Protection

When battery is replaced, device power (V
The residue-voltage may trip below V
cause a poor power-on reset. Fig.35 and Fig. 36 show how to build the residue-voltage
protection circuit.
Product Specification (V1.0) 10.03.2006
(This specification is subject to change without further notice)
Vdd
/RESET
Fig. 5-34 External Power-Up Reset Circuit
Vdd
EM78P312N
EM78P809N
Q1
/RESET
40K
Fig. 5-35 Residue Voltage Protection Circuit 1
Vdd
EM78P312N
EM78P809N
Q1
/RESET
40K
Fig. 5-36 Residue Voltage Protection Circuit 2
R
Rin
C
) is taken off but residue-voltage remains.
DD
minimum, but not to zero. This condition may
DD
33K
10K
1N4684
R1
R2
EM78P312N
8-Bit Microcontroller
D
Vdd
Vdd
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