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PDF IZ1990 Data sheet ( Hoja de datos )
| Número de pieza | IZ1990 | |
| Descripción | CMOS IC | |
| Fabricantes | IK Semiconductor | |
| Logotipo |  |
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TECHNICAL DATA
CMOS IC FOR ELECTRONIC KEY
IZ1990
DESCRIPTION
CMOS microcircuit is essentially an electronic carrier of the unique 64-bit digital code.
The code is stored in the internal nonvolatile memory. The data exchange is performed by
the protocol 1-Wire, which requires one sole data pin and the common pin. The
microcircuit supports the function of the protocol 1-Wire of ROM search, which makes it
possible for several devices to operate on one bus. This protocol determines the alteration
conditions of the bus status and the time intervals during synchronization by the
synchropulses cuts of the control device. Data read-out and writing are performed by the
junior significant bit forward.
TRANSACTION SEQUENCE
Access sequence to IZ1990 via 1-Wire port is as follows:
Initialization
ROM function command
Data read-out
INITIALIZATION
All transactions on the bus 1-Wire start with the initialization sequence. The
initialization sequence consists of the reset pulse, applied by the bus master, followed by
the availability pulse (or pulses), applied by the slave buses (or slave buses).
The availability pulse informs the bus master, that IZ1990 is connected to the bus and
is ready for operation.
ROM FUNCTIONS COMMANDS
After the bus master has determined availability of the device, it can apply one out of
four commands for operation with ROM. All commands for operation with ROM have the
length of 8 bits. These commands are enumerated below (see also the diagram in Fig. 4)
ROM Reading [33h] or [0Fh]
This command enables the bus master to read the 8-bit group code IZ1990, its
unique 48-bit serial number and 8-bit control total (CRC). This command can be used only,
if the bus has one device IZ1990. If the bus has more, than one slave, there will be a
conflict of data, when all slave ones, when all slave ones attempt to apply at the same time
1
May 2014, Rev. 00
1 page  
Read-out
IZ1990
Figure 2 – Procedures of writing / read-out
EQUIVALENT CIRCUIT IZ1990
Equivalent circuit 1-Wire of port IC IZ1990 is listed in Figure 3.
RX
TX
MOSFET
100 Ohm
DATA
5 uA
тип.
Figure 3 - Equivalent circuit 1-Wire of port IZ1990.
5
May 2014, Rev. 00
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet IZ1990.PDF ] | |
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