[AP4201]

015008157-E-00

- 21 -

2015/09

10.5. Input Voltage Range (VIN)

Basically, the input voltage range is 8V~24V. It can be changed to 4.5~5.5V by shorting the VIN pin and the

VDC1 pin when 5V power supply is used. A normal operation cannot be guaranteed with an input that is in the

range of 5.5V~8V.

Table 11. Input Voltage Range

Input Voltage Range 1

Input Voltage Range 2

8V～24V

1

mF

1

mF

VIN

VDC

4.5V～5.5V

1

mF

VIN

VDC

10.6. POR Operation (Power on Reset)

The internal POR circuit releases reset state after a specific period of time (t1) when a power supply more than

6V is applied to the VIN pin. Do not input a command code via the interface for specific period of time (t2)

after releasing reset state for a certain stabilization of the internal oscillation frequency. The following figure

shows the POR timing when power is applied. During the “t1” period, a command from the interface is not

accepted. Please note, that a command accepted during the “t2” period may be interpreted incorrectly.

VIN

6V(VINset)

Vset

8V～36V

t1

t2

Reset release

Internal

5.0V LDO

Internal POR

Reset

SCI-I/F

can be entered

5V

Figure 6. POR Operation (Power on Reset)

Table 12. POR Timing when Power Applied

Parameter

min

typ

max

Unit

Note

t1

-

-

2800

ms

VIN pin voltage > 6V, IDC1= -30mA.

Bypass capacitor between the VDC pin and GND CVDC=1.0mF.

t2

-

-

200

ms

Stabilization time of internal power

Note 17. As shown above, the AP4201 is in normal operation after 3msec at maximum from the time the VIN

voltage reaches 6V. In the case of “Input Voltage Range 2”, the AP4201 is in normal operation after 3mec

from the time the VIN voltage reaches 4.5V.

Note 18. In case that the internal POR circuit is reset by decreasing VIN voltage follows the prescribed times

above.

8V~24V

1.8V

VDC2

Signal input

available