BD8919F Datasheet, PDF (14/16 Pages) Rohm – IC Card Interface ICs with Built-in Low Noise LDO Regulator

BD8918F, BD8918FV, BD8919F, BD8919FV
BD8919F/FV application examples
CONTROLLER
Technical Note
+3.3V
0.1uF
10uF
(22pF)
(22pF)
XTAL1
16MHz _XTAL2
1
2
16 ^GND
15 ^CMDVCCB
220Ω _{VDD 3}
14 ^OFFB
CLKSEL _{4 BD8919F/ 13} PRES
RSTIN _{5 BD8919FV 12} VDDP
+5V
IO_U ₆
11 ^VCC
CGND ₇
10 ^CLK
IO_C
8
9 ^RST
1uF
CARD CONNECTION
0.22uF
C5 C1
C6 C2
C7 C3
C8 C4
K1
K2
●Precautions for use
1) The capacitor for the VCC pin should be placed as close as possible to the IC between VCC and CGND so that the
ESR becomes less than 100m.
2) Connect a capacitor of over 0.1F for VDD and over 10F for VDDP as close as possible to the IC so that the ESR
becomes less than 100m to reduce the power line noise. We recommend the use of capacitors with the largest
possible capacitance.
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2009.12 - Rev.C