Toshiba H1 Series - Manual (Page 20)

TMP92CZ26A
92CZ26A-17
This LSI has the restriction for the order of supplying power. Be sure to supply external
3.3V power with 1.5V power is supplied.
Note1: Inernal 1.5 V and External 3.3V power supply can be set to ON/OFF at the same time. However, external pin
may become unstable condition momentary. Therefore, set external power supply to ON/OFF during internal
power supply is stabile like above figure if there is possibility to affect machinery connected with micro controller.
Note2: When setting to ON, don’t set 3.3V power supply earlier than 1.5V power supply. When setting to OFF, don’t
set to 3.3V power supply later than 1.5 V power supply.
Figure 3.1.2 Power on Reset Timing Example
DVCC1A
DVCC1B
DVCC1C
RESET
AVCC
DVCC3B
DVCC3A
Power supply is rising with
in 100mS, and stabilizes.
After 1.5V power
supply is falling, set
3.3V to OFF.
After 1.5V power
supply is rising,
set 3.3V to ON.
Power supply is falling with
in 100mS, and stabilizes.
High-frequency oscillation
stabilization time
20 system clock
1.5V
Power
3.3V
Power
Stand-by Mode (PMC) Power On Power Off
PWE terminal