BD8919F_1 Datasheet, PDF (14/16 Pages) Rohm – IC Care Interface ICs with Built-in Low LDO Regulator

BD8918F,BD8918FV,BD8919F,BD8919FV
BD8919F/FV application examples
CONTROLLER
Technical Note
+3.3V
0.1µF
10µF
(22pF)
(22pF)
XTAL1
16MHz _XTAL2
1
2
220Ω _{VDD 3}
16 ^GND
15 ^CMDVCCB
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
1µF
CARD CONNECTION
0.22µF
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 100Ω
2) Connect a capacitor of over 0.1µF for VDD and over 10µF 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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14/15
2010.4 - Rev.D