bd8918fv ROHM Co. Ltd., bd8918fv Datasheet - Page 4

• Manufacturer Part Number: bd8918fv
• Description: Ic Card Interface Ics With Built-in Low Noise Ldo Regulator
• Manufacturer: ROHM Co. Ltd.

●Pin Description
© 2009 ROHM Co., Ltd. All rights reserved.
BD8918F,BD8918FV,BD8919F,BD8919FV
www.rohm.com
Pin No. Pin Name
*Capacitors to be connected to VDD, VDDP and VCC should be placed immediately next to the pins (ESR<100m).
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
CMDVCCB
CLKSEL
XTAL1
XTAL2
RSTIN
CGND
VDDP
PRES
OFFB
IO_U
IO_C
VDD
VCC
GND
RST
CLK
I/O
I/O
I/O
O
O
O
O
O
S
S
S
S
I
I
I
I
I
Signal
VDDP
Level
GND
GND
VDD
VDD
VDD
VDD
VDD
VDD
VCC
VCC
VCC
VCC
VDD
VDD
VDD
Crystal connection or input for external clock
Crystal connection (leave open pin when external clock source is used)
3.3 V power source pin for host interface.
Connect 0.1µF capacitor between the VDD and GND pins.
Input for clock frequency
division setting.
Pulled down to GND
with a 50k resistor.
Card reset signal input. Pulled down to GND with a 50k resistor.
Host data I/O line; Pulled up to VDD with an 11k resistor
GND
I/O data line on the card side. Pulled up to VCC with an 11k r esistor.
Card reset output
Card clock output
Card supply voltage. Connect 1µF capacitor between VCC and the CGND pins.
5V power source pin for card power feed. Connect 10µF capacitor between the
VDDP and CGND pins.
Card presence contact input (“H” active). Pulled up to VDD with a 50k resistor.
Connected to a switch where GND level is inputted when no card is inserted and
OPEN is inputted when a card is inserted. When “H” level is detected, a card is
assumed to be inserted and waits for the CMDVCCB input for the confirmation,
after the debounce time of typ. 8ms.
Alarm output pin (“L” active).
NMOS open drain output. Pulled up to VDD with a 20k resistor.
Activation sequence command input; The activation sequence starts by signal
input (HL) from the host
GND
4/15
Pin Function
BD8918F/FV H: 1/1 division; L: 1/2 division.
BD8919F/FV H: 1/2 division; L: 1/4 division.
Technical Note
2010.4 - Rev.D