em78p210n ELAN Microelectronics Corp, em78p210n Datasheet - Page 52

• Manufacturer Part Number: em78p210n
• Description: 8-bit Microcontroller With Otp Rom
• Manufacturer: ELAN Microelectronics Corp

EM78P210N
8-Bit Microcontroller with OTP ROM
46 •
6.9.2 Residual Voltage Protection
When the battery is replaced, device power Vdd is removed but residual voltage
remains. The residual voltage may trip below Vdd minimum, but not to zero. This
condition may cause a poor power-on reset. Figure 6-16 and Figure 6-17 show how to
create a protection circuit against residual voltage.
Figure 6-18 Residual Voltage Protection Circuit 1
Figure 6-19 Residual Voltage Protection Circuit 2
/RESET
/RESET
VDD
VDD
100K
Q1
Q1
R3
(This specification is subject to change without further notice)
10K
1N4684
Product Specification (V1.2) 04.22.2008
33K
R1
R2
VDD
VDD