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Example of application circuit
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BU2280FV
Description of terminal
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), 5PIN-6PIN (AVDD) and 7PIN (AVSS), 10PIN
(VSS2) and 11PIN (VDD2), 13PIN(VSS2) and 14PIN (VDD2), 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 BU2280FV 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.
PIN No.
PIN name
PIN function
1
VDD1
Power supply for 27MHz
2
VSS1
GND for 27MHz
3
CLK27M1
27.0000MHz Clock output terminal 1
4
CLK27M2
27.0000MHz Clock output terminal 2
5
AVDD
Power supply for Analog block
6
AVDD
Power supply for Analog block
7
AVSS
GND for Analog block
8
XTALIN
Crystal input terminal
9
XTALOUT
Crystal output terminal
10
VSS2
GND for 33MHz
11
VDD2
Power supply for 33MHz
12
CLK33M
33.8688MHz Clock output terminal
13
VSS2
GND for 33MHz
14
VDD2
Power supply for 33MHz
15
CLK512FS2
CTRLFS=OPEN:24.5760MHz, CTRLFS=L:22.5792MHz
16
CLK512FS1
CTRLFS=OPEN:24.5760MHz, CTRLFS=L:22.5792MHz
17
DVSS
GND for Digital block
18
DVSS
GND for Digital block
19
DVDD
Power supply for Digital block
20
CLK384FS
CTRLFS=OPEN:18.4320MHz, CTRLFS=L:16.9344MHz
21
OE
Output enable (with pull-up), OPEN:enable、L:disable
22
CLK768FS
CTRLFS=OPEN:36.8640MHz, CTRLFS=L:33.8688MHz
23
CTRLFS
15, 16, 20, 22PIN output selection (with pull-up)
OPEN:24.5760MHz(15PIN, 16PIN), 18.4320MHz(20PIN), 36.8640MHz(22PIN)
L:22.5792MHz(15PIN, 16PIN), 16.9344MHz(20PIN), 33.8688MHz(22PIN)
24
CLK27M3
27.0000MHz Clock output terminal 3
Fig.126
36.8640MHz
1:VDD1
24:CLK27M3
27.0000MHz
0.1uF
2:VSS1
23:CTRLFS
OPEN:48.0kHz type
L:44.1kHz type
27.0000MHz
3:CLK27M1
22:CLK768FS
or 33.8688MHz
27.0000MHz
4:CLK27M2
21:OE
OPEN:Enable
5:AVDD
20:CLK384FS
18.4320MHz
or 16.9344MHz
6:AVDD
19:DVDD
0.1uF
7:AVSS
18:DVSS
8:XTALIN
17:DVSS
9:XTALOUT
16:CLK512FS1
24.5760MHz
or 22.5792MHz
10:VSS2
15:CLK512FS2
24.5760MHz
0.1uF
or 22.5792MHz
11:VDD2
14:VDD2
0.1uF
33.8688MHz
12:CLK33M
13:VSS2
BU2280FV
L:Disable