Toshiba TX03 Series Manual page 439

19. Low Voltage Detection Circuit (VLTD)
The low voltage detection circuit generates a reset signal by detecting a decreasing voltage.
Note: Due to the fluctuation of supply voltage, the voltage detection circuit may not operate properly. Users should
give due consideration based on the electrical characteristic in the device designing.
19.1 Structure
The low voltage detection circuit consists of a reference voltage generation circuit, a detection voltage level selec-
tion circuit, a comparator and control registers.
The supply voltage is divided by the ladder resistor and input to the detection voltage selection circuit. The detec-
tion voltage selection circuit selects a voltage according to the specified detection voltage (4.1 ± 0.2V), and the com-
parator compares it with the reference voltage. When the supply voltage becomes lower than the detection voltage
(4.1 ± 0.2V), a voltage detection reset signal is generated.
DVDD
to POR circuit
4.1V±0.2V
Reference voltage
generation circuit
Figure 19-1 Voltage Detection Circuit)
Page 417
-
+
VDCR
TMPM3V6/M3V4
Voltage detection reset
2019-02-06