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BU21072MUV-E2 bảng dữ liệu(PDF) 8 Page - Rohm

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Datasheet
Datasheet
BU21072MUV / BU21078MUV
TSZ02201-0Y2Y0FZ00020-1-2
© 2012 ROHM Co., Ltd. All rights reserved.
12.Mar.2012 Rev.001
www.rohm.com
TSZ22111・15・001
●Power on sequence
Power supply pin is VDD only. AVDD and DVDD are supplied by each LDO included BU21072/78MUV, so that have no
priority about power on sequence. When VDD reaches to the effective voltage, power-on-reset which initializes the digital
block is released.
Power-On-Reset monitoring VDD, so it should be set to proper value of decoupling capacitor and VDD rise time, so as to
rise to the proper voltage (DVDD→VDD).
When power-on-reset is released, MPU starts initial sequence. Inform by the INT port to the host that the initialization has
been completed. After verify that the initialization has completed, the host will need to resend the command to the IC.
In the case that WDTR is released as well, MPU starts initial sequence. If WDTR has released, all registers have been
initialized. So the host will need to resend the command to the IC.
VDD
Power on Reset
(ActiveLow)
Initialize IC
about 350usec
Hi-Z
about 200usec
LED0-6
INT
Interrupt of Initialization Done
C1
0.1uF
VDD decoupling capacitor
C2
1.0uF
DVDD decoupling capacitor
C3
2.2uF
AVDD decoupling capacitor
Recommended value of external capacitors
Over 100usec
AVDD
VDD
DVDD
2.73V
1.50V
3.30V
Fig.13 Timing chart of power on sequence
Fig.12 Arrangement of external decoupling capacitors
Fig.14 Timing chart of initialization


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