CHAPTER 13 POWER-ON-CLEAR CIRCUIT
User’s Manual U18172EJ2V0UD
196
13.2 Configuration of Power-on-Clear Circuit
The block diagram of the power-on-clear circuit is shown in Figure 13-1.
Figure 13-1. Block Diagram of Power-on-Clear Circuit
−
+
Reference
voltage
source
Internal reset signal
V
DD
V
DD
13.3 Operation of Power-on-Clear Circuit
In the power-on-clear circuit, the supply voltage (V
DD
) and detection voltage (V
POC
= 2.1 V
±
0.1 V) are compared,
and an internal reset signal is generated when V
DD
< V
POC
, and an internal reset is released when V
DD
≥
V
POC
.
Figure 13-2. Timing of Internal Reset Signal Generation in Power-on-Clear Circuit
Time
Supply voltage (V
DD
)
POC detection voltage
(V
POC
= 2.1 V ±0.1 V)
Internal reset signal