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L99MH98 bảng dữ liệu(PDF) 26 Page - STMicroelectronics

tên linh kiện L99MH98
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L99MH98 bảng dữ liệu(HTML) 26 Page - STMicroelectronics

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Figure 10. VDH and VDD high, EN pin goes high and low
VDH
EN
VDD
VENH
3.3 V or 5 V
VENL
V
t
The second case of a possible power-on sequence is shown in the Figure 11. In this case the VDD is raised while
the VDH and EN pins are kept low. After the VDD pin is high and stable, the EN pin is raised to turn on the logic of
the L99MH98 or lowered to turn it off. L99MH98 turns on when the EN pin exceeds the rising VENH threshold and
will turn off when it drops below the falling VENL threshold.
Figure 11. VDH and VDD high, EN pin goes high and low
VDH
EN
VDD
VENH
3.3 V or 5 V
VENL
V
t
Another case of a possible power-on sequence of L99MH98 is shown in the Figure 12. In this case VDD, VDH and
EN pins are raised at the same time with the same slew rate.
Figure 12. VDH, VDD and EN pin goes high and low with the same slew rate
VDH
EN
VDD
3.3 V or 5 V
3.3 V or 5 V
VBAT (13 V typ)
V
t
L99MH98
Functional description
DS14611 - Rev 3
page 26/147



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