DS8005 查看數據表（PDF） - Maxim Integrated
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DS8005 Datasheet PDF : 20 Pages
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DS8005
Smart Card Interface
Pin Configuration
TOP VIEW
CLKDIV1 1
CLKDIV2 2
5V/3V 3
1_8V 4
VCCB 5
VDDA 6
RSTB 7
CLKB 8
CGND 9
PRESA 10
I/OA 11
I/OB 12
PRESB 13
CGND 14
DS8005
SO/TSSOP
28 SEL_AB
27 OFF2
26 I/OIN
25 XTAL2
24 XTAL1
23 OFF
22 GND
21 VDD
20 RSTIN
19 CMDVCC
18 VDDA2
17 VCCA
16 RSTA
15 CLKA
Pin Description
PIN
NAME
FUNCTION
1, 2
CLKDIV1, Clock Divider. Determines the divided-down input clock frequency (presented at XTAL1 or from a crystal
CLKDIV2 at XTAL1 and XTAL2) on the CLK_ output pin. Dividers of 1, 2, 4, and 8 are available.
5V/3V Selection Pin. Allows selection of 5V or 3V for communication with an IC card. Logic-high selects
3
5V/3V 5V operation; logic-low selects 3V operation. The 1_8V pin overrides the setting on this pin if active. See
Table 3 for a complete description of choosing card voltages.
1.8V Operation Selection. This active-high input puts the device into 1.8V smart card communication
4
1_8V mode. The selected interface (when activated) powers a card with a 1.8V supply and all I/O lines
operate at 1.8V.
5
VCCB
Smart Card Supply Voltage, Interface B. Decouple to CGND (card ground) with 2 x 100nF or 100 +
200nF capacitors (ESR < 100mΩ).
6
7
8
9, 14
10
VDDA
RSTB
CLKB
CGND
PRESA
Smart Card Interface Supply. Connect to a 5V power supply to support 1.8V, 3.0V, and 5.0V cards. If
VDD ≥ 4.9V, this pin can be connected directly to VDD. Decouple this pin to GND using 100nF and 10µF
capacitors.
Smart Card Reset, Interface B. Card reset output from contact C2.
Smart Card Clock, Interface B. Card clock, contact C3.
Smart Card Ground
Interface A Card Presence Indicator. Active-high card presence input for the first card interface. When the
presence indicator becomes active, a debounce timeout begins. After 8ms (typ), the OFF signal becomes
active if the first card interface is selected (SEL_AB low), else the OFF2 signal becomes active.
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