DS1205S 데이터 시트보기 (PDF) - Dallas Semiconductor -> Maxim Integrated
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DS1205S Datasheet PDF : 17 Pages
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DS1205S
DS1205S
MultiKey Chip
FEATURES
• Three secure read/write data partitions of 384 bits
each
• One non-secure read/write data partition of 512 bits
• Secure data cannot be deciphered by reverse engi-
neering
• Guaranteed unique, 48-bit, laser etched serial
number
• 64-bit password and I.D. fields provide positive identi-
fication and security for each secure data partition
• Maximum data transfer rate of 2 million bits/second
• Low-power CMOS circuitry
• Access via 3-wire or 1-wire interface
• Applications include proprietary data, financial trans-
actions, secure personnel areas, and systems ac-
cess control
PIN ASSIGNMENT
VCCI
1
NC
2
RST
3
DQ
4
NC
5
CLK
6
NC
7
GND
8
VCCO
16
15
NC
14
I/O
13
GND
12
NC
11
DQOE
10
NC
9
BAT
DS1205S 16-Pin SOIC (300 mil)
See Mech. Drawings
Section
PIN DESCRIPTION
VCCI
RST
– +5V Supply (Battery Backup Mode)
– Reset (3-Wire)
DQ
– Data (3-Wire)
CLK
– Clock (3-Wire)
GND
– Ground
BAT
– Battery (+) (Battery Backup Mode)
DQOE
– Data Available (3-Wire)
I/O
– Data I/O (1-Wire)
VCCO
– Battery (+) (Battery Powered Mode)
DESCRIPTION
The DS1205S MultiKey Chip is an enhanced version of
the DS1204U Electronic Key which has both a standard
3-wire interface (data, clock, and reset) and a 1-wire in-
terface. The DS1205S MultiKey has three secure read/
write subkeys which are each 384 bits in length. In addi-
tion, there is a 512-bit read/write scratchpad which can
be used as a non-secure data area or as a holding regis-
ter for data transfer to one of the three subkeys. Each
subkey within the part is uniquely addressable on byte
boundaries.
OPERATING MODES
There are two modes of operation for powering the
DS1205S MultiKey Chip. In the Normal Mode (Battery
Backup), VCC power is supplied to the part on the VCCI
pin, while the battery backup source is applied to the
BAT pin. In this mode of operation, the chip supply is
switched internally between VCCI and BAT (depending
on which is higher) and this level is presented internally
to the VCCO pin. In the Battery Operate Mode, the bat-
tery supply is connected directly to the VCCO pin while
the VCCI and BAT pins are grounded.
021798 1/17
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