CHAPTER 22 POWER-ON-CLEAR CIRCUIT
User’s Manual U16899EJ2V0UD
405
22.2 Configuration of Power-on-Clear Circuit
The block diagram of the power-on-clear circuit is shown in Figure 22-1.
Figure 22-1. Block Diagram of Power-on-Clear Circuit
−
+
Reference
voltage
source
Internal reset signal
V
DD
V
DD
22.3 Operation of Power-on-Clear Circuit
In the power-on-clear circuit, the supply voltage (V
DD
) and detection voltage (V
POC
) are compared, and when V
DD
<
V
POC
, an internal reset signal is generated.
Figure 22-2. Timing of Internal Reset Signal Generation in Power-on-Clear Circuit
Time
Supply voltage (V
DD
)
POC detection voltage
(V
POC
)
Internal reset signal