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BU2285FV,BU2363FV
Technical Note
13/16
www.rohm.com
2009.04 - Rev.A
2009 ROHM Co., Ltd. All rights reserved.
1:VDD1
24:CLK33M
33.8688MHz
0.1uF
2:VSS1
23:CTRLB
OPEN:27.0000MHz
L
:13.5000MHz
16.9344MHz
3:CLK16M
22:CLK54M
54.0000MHz
4:AVSS
21:OE
OPEN:Enable
0.1uF
L
:Disable
5:AVDD
20:CLKDAC
27.0000MHz
or 13.5000MHz
6:AVDD
19:DVDD
0.1uF
7:AVSS
18:DVSS
8:XTALIN
17:DVSS
9:XTALOUT
16:CLK27M
27.0000MHz
10:NC
15:VDD2
OPEN:48.0kHz type
0.1uF
L
:44.1kHz type
11:CTRLA
14:VSS2
36.8640MHz
12:CLKA
13:CLKB
18.4320MHz
or 33.8688MHz
or 16.9344MHz
BU2285FV
●Example of application circuit
◎BU2285FV
Pin Function
PIN No.
PIN Name
PIN Function
1
VDD1
33MHz system power supply
2
VSS1
33MHz system GND
3
CLK16M
16.9344MHz output
4
AVSS
Analog GND
5
AVDD
Analog power supply
6
AVDD
Analog power supply
7
AVSS
Analog GND
8
XTALIN
Crystal input terminal
9
XTALOUT
Crystal output terminal
10
NC
11
CTRLA
CLKA or B output selection (with pull-up)
12
CLKA
CTRLA=OPEN:36.8640MHz, CTRLA=L:33.8688MHz
13
CLKB
CTRLA=OPEN:18.4320MHz, CTRLA=L:16.9344MHz
14
VSS2
CLKA, B
GND
15
VDD2
CLKA, B
power supply
16
CLK27M
27.0000MHz output
17
DVSS
Digital GND
18
DVSS
Digital GND
19
DVDD
Digital power supply
20
CLKDAC
CTRLB=OPEN:27.0000MHz, CTRLB=L:13.5000MHz
21
OE
Output enable (with pull-up), OPEN:enable, L:disable
22
CLK54M
54.0000MHz output
23
CTRLB
CLKDAC output selection(with pull-up)
24
CLK33M
33.8688MHz output
Note) Basically, mount ICs to the printed circuit board for use.
(If the ICs are not mounted to the printed circuit board, the characteristics of ICs may not be fully demonstrated.)
Mount 0.1
F capacitors in the vicinity of the IC PINs between 1PIN (VDD1) and 2PIN (VSS1), 4PIN (AVSS) and 5PIN (AVDD), 6PIN (AVDD) and 7PIN
(AVSS), 14PIN (VSS2) and 15PIN (VDD2), and 17PIN/18PIN (DVSS) and 19PIN (DVDD), respectively.
Depending on the conditions of the printed circuit board, mount an additional electrolytic capacitor between the power supply and GND terminal.
For EMI protection, it is effective to put ferrite beads in the origin of power supply to be fed to BU2285FV from the printed circuit board or to insert a
capacitor (of 1
or less), which bypasses high frequency desired, between the power supply and the GND terminal.
Fig.85
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